[ONOS-3618] Implement REST API for Meter query, insert, delete

* Implement encode & decode method for MeterBandCodec & MeterCodec
* Implement MetersWebResource
* Add unit test for MeterBandCodec & MeterCodec
* Add unit test for MetersWebResource
* Add meter insertion json example
* Add Swagger doc

Change-Id: I07284c6678c08b3cb9e109e86ffb2cf28bf36447

@@ -51,7 +51,7 @@ public interface Band {
      *
      * @return the long value of the size
      */
-    long burst();
+    Long burst();
 
     /**
      * Only meaningful in the case of a REMARK band type.
@@ -60,7 +60,7 @@ public interface Band {
      *
      * @return a short value
      */
-    short dropPrecedence();
+    Short dropPrecedence();
 
     /**
      * Signals the type of band to create.

@@ -45,12 +45,12 @@ public final class DefaultBand implements Band, BandEntry {
     }
 
     @Override
-    public long burst() {
+    public Long burst() {
         return burstSize;
     }
 
     @Override
-    public short dropPrecedence() {
+    public Short dropPrecedence() {
         return prec;
     }
 

@@ -50,6 +50,8 @@ import org.onosproject.net.intent.Constraint;
 import org.onosproject.net.intent.HostToHostIntent;
 import org.onosproject.net.intent.Intent;
 import org.onosproject.net.intent.PointToPointIntent;
+import org.onosproject.net.meter.Band;
+import org.onosproject.net.meter.Meter;
 import org.onosproject.net.statistic.Load;
 import org.onosproject.net.topology.Topology;
 import org.onosproject.net.topology.TopologyCluster;
@@ -102,6 +104,8 @@ public class CodecManager implements CodecService {
         registerCodec(Driver.class, new DriverCodec());
         registerCodec(GroupBucket.class, new GroupBucketCodec());
         registerCodec(Load.class, new LoadCodec());
+        registerCodec(Meter.class, new MeterCodec());
+        registerCodec(Band.class, new MeterBandCodec());
         registerCodec(TableStatisticsEntry.class, new TableStatisticsEntryCodec());
         registerCodec(PortStatistics.class, new PortStatisticsCodec());
         registerCodec(Metric.class, new MetricCodec());

+/*
+ * Copyright 2014-2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.codec.impl;
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.net.meter.Band;
+import org.onosproject.net.meter.DefaultBand;
+import org.slf4j.Logger;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onlab.util.Tools.nullIsIllegal;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Meter band JSON codec.
+ */
+public final class MeterBandCodec extends JsonCodec<Band> {
+    private final Logger log = getLogger(getClass());
+
+    // JSON field names
+    private static final String TYPE = "type";
+    private static final String RATE = "rate";
+    private static final String BURST_SIZE = "burstSize";
+    private static final String PREC = "prec";
+    private static final String PACKETS = "packets";
+    private static final String BYTES = "bytes";
+    private static final String MISSING_MEMBER_MESSAGE = " member is required in Band";
+
+    @Override
+    public ObjectNode encode(Band band, CodecContext context) {
+        checkNotNull(band, "Band cannot be null");
+
+        ObjectNode result = context.mapper().createObjectNode()
+                .put(TYPE, band.type().toString())
+                .put(RATE, band.rate())
+                .put(PACKETS, band.packets())
+                .put(BYTES, band.bytes())
+                .put(BURST_SIZE, band.burst());
+
+        if (band.dropPrecedence() != null) {
+            result.put(PREC, band.dropPrecedence());
+        }
+
+        return result;
+    }
+
+    @Override
+    public Band decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        // parse rate
+        long rate = nullIsIllegal(json.get(RATE), RATE + MISSING_MEMBER_MESSAGE).asLong();
+
+        // parse burst size
+        long burstSize = nullIsIllegal(json.get(BURST_SIZE), BURST_SIZE + MISSING_MEMBER_MESSAGE).asLong();
+
+        // parse precedence
+        Short precedence = null;
+
+        // parse band type
+        String typeStr = nullIsIllegal(json.get(TYPE), TYPE + MISSING_MEMBER_MESSAGE).asText();
+        Band.Type type;
+        switch (typeStr) {
+            case "DROP":
+                type = Band.Type.DROP;
+                break;
+            case "REMARK":
+                type = Band.Type.REMARK;
+                precedence = (short) nullIsIllegal(json.get(PREC), PREC + MISSING_MEMBER_MESSAGE).asInt();
+                break;
+            default:
+                log.warn("The requested type {} is not defined for band.", typeStr);
+                return null;
+        }
+
+        Band band = DefaultBand.builder()
+                .ofType(type)
+                .burstSize(burstSize)
+                .withRate(rate)
+                .dropPrecedence(precedence)
+                .build();
+
+        return band;
+    }
+}

+/*
+ * Copyright 2014-2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.codec.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.meter.Band;
+import org.onosproject.net.meter.DefaultMeter;
+import org.onosproject.net.meter.Meter;
+import org.onosproject.net.meter.MeterId;
+import org.slf4j.Logger;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.IntStream;
+
+import static com.google.common.base.Preconditions.checkNotNull;
+import static org.onlab.util.Tools.nullIsIllegal;
+import static org.slf4j.LoggerFactory.getLogger;
+
+
+/**
+ * Meter JSON codec.
+ */
+public final class MeterCodec extends JsonCodec<Meter> {
+    private final Logger log = getLogger(getClass());
+
+    // JSON field names
+    private static final String ID = "id";
+    private static final String STATE = "state";
+    private static final String LIFE = "life";
+    private static final String PACKETS = "packets";
+    private static final String BYTES = "bytes";
+    private static final String REFERENCE_COUNT = "referenceCount";
+    private static final String APP_ID = "appId";
+    private static final String BURST = "burst";
+    private static final String DEVICE_ID = "deviceId";
+    private static final String UNIT = "unit";
+    private static final String BANDS = "bands";
+    public static final String REST_APP_ID = "org.onosproject.rest";
+    private static final String MISSING_MEMBER_MESSAGE = " member is required in Meter";
+
+    @Override
+    public ObjectNode encode(Meter meter, CodecContext context) {
+        checkNotNull(meter, "Meter cannot be null");
+        ObjectNode result = context.mapper().createObjectNode()
+                .put(ID, meter.id().toString())
+                .put(LIFE, meter.life())
+                .put(PACKETS, meter.packetsSeen())
+                .put(BYTES, meter.bytesSeen())
+                .put(REFERENCE_COUNT, meter.referenceCount())
+                .put(UNIT, meter.unit().toString())
+                .put(BURST, meter.isBurst())
+                .put(DEVICE_ID, meter.deviceId().toString());
+
+        if (meter.appId() != null) {
+            result.put(APP_ID, meter.appId().toString());
+        }
+
+        if (meter.state() != null) {
+            result.put(STATE, meter.state().toString());
+        }
+
+        ArrayNode bands = context.mapper().createArrayNode();
+        meter.bands().forEach(band -> {
+            ObjectNode bandJson = context.codec(Band.class).encode(band, context);
+            bands.add(bandJson);
+        });
+        result.set(BANDS, bands);
+        return result;
+    }
+
+    @Override
+    public Meter decode(ObjectNode json, CodecContext context) {
+        if (json == null || !json.isObject()) {
+            return null;
+        }
+
+        final JsonCodec<Band> meterBandCodec = context.codec(Band.class);
+        CoreService coreService = context.getService(CoreService.class);
+
+        // parse meter id
+        int meterIdInt = nullIsIllegal(json.get(ID), ID + MISSING_MEMBER_MESSAGE).asInt();
+        MeterId meterId = MeterId.meterId(meterIdInt);
+
+        // parse device id
+        DeviceId deviceId = DeviceId.deviceId(nullIsIllegal(json.get(DEVICE_ID),
+                DEVICE_ID + MISSING_MEMBER_MESSAGE).asText());
+
+        // application id
+        ApplicationId appId = coreService.registerApplication(REST_APP_ID);
+
+        // parse burst
+        boolean burst = false;
+        JsonNode burstJson = json.get("burst");
+        if (burstJson != null) {
+            burst = burstJson.asBoolean();
+        }
+
+        // parse unit type
+        String unit = nullIsIllegal(json.get(UNIT), UNIT + MISSING_MEMBER_MESSAGE).asText();
+        Meter.Unit meterUnit;
+
+        switch (unit) {
+            case "KB_PER_SEC":
+                meterUnit = Meter.Unit.KB_PER_SEC;
+                break;
+            case "PKTS_PER_SEC":
+                meterUnit = Meter.Unit.PKTS_PER_SEC;
+                break;
+            default:
+                log.warn("The requested unit {} is not defined for meter.", unit);
+                return null;
+        }
+
+        // parse meter bands
+        List<Band> bandList = new ArrayList<>();
+        JsonNode bandsJson = json.get(BANDS);
+        checkNotNull(bandsJson);
+        if (bandsJson != null) {
+            IntStream.range(0, bandsJson.size()).forEach(i -> {
+                ObjectNode bandJson = get(bandsJson, i);
+                bandList.add(meterBandCodec.decode(bandJson, context));
+            });
+        }
+
+        Meter meter;
+        if (burst) {
+            meter = DefaultMeter.builder()
+                    .withId(meterId)
+                    .fromApp(appId)
+                    .forDevice(deviceId)
+                    .withUnit(meterUnit)
+                    .withBands(bandList)
+                    .burst().build();
+        } else {
+            meter = DefaultMeter.builder()
+                    .withId(meterId)
+                    .fromApp(appId)
+                    .forDevice(deviceId)
+                    .withUnit(meterUnit)
+                    .withBands(bandList).build();
+        }
+
+        return meter;
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.codec.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+import org.onosproject.net.meter.Band;
+
+/**
+ * Hamcrest matcher for bands.
+ */
+public final class MeterBandJsonMatcher extends TypeSafeDiagnosingMatcher<JsonNode> {
+
+    private final Band band;
+
+    private MeterBandJsonMatcher(Band band) {
+        this.band = band;
+    }
+
+    /**
+     * Matches the contents of a meter band.
+     *
+     * @param bandJson JSON representation of band to match
+     * @param description Description object used for recording errors
+     * @return true if contents match, false otherwise
+     */
+    @Override
+    protected boolean matchesSafely(JsonNode bandJson, Description description) {
+        // check type
+        final String jsonType = bandJson.get("type").textValue();
+        if (!band.type().name().equals(jsonType)) {
+            description.appendText("type was " + jsonType);
+            return false;
+        }
+
+        // check rate
+        final long jsonRate = bandJson.get("rate").longValue();
+        if (band.rate() != jsonRate) {
+            description.appendText("rate was " + jsonRate);
+            return false;
+        }
+
+        // check burst size
+        final long jsonBurstSize = bandJson.get("burstSize").longValue();
+        if (band.burst() != jsonBurstSize) {
+            description.appendText("burst size was " + jsonBurstSize);
+            return false;
+        }
+
+        // check precedence
+        final JsonNode jsonNodePrec = bandJson.get("prec");
+        if (jsonNodePrec != null) {
+            if (band.dropPrecedence() != jsonNodePrec.shortValue()) {
+                description.appendText("drop precedence was " + jsonNodePrec.shortValue());
+                return false;
+            }
+        }
+
+        // check packets
+        final JsonNode jsonNodePackets = bandJson.get("packets");
+        if (jsonNodePackets != null) {
+            if (band.packets() != jsonNodePackets.asLong()) {
+                description.appendText("packets was " + jsonNodePackets.asLong());
+                return false;
+            }
+        }
+
+        final JsonNode jsonNodeBytes = bandJson.get("bytes");
+        if (jsonNodeBytes != null) {
+            if (band.bytes() != jsonNodeBytes.asLong()) {
+                description.appendText("bytes was " + jsonNodeBytes.asLong());
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText(band.toString());
+    }
+
+    /**
+     * Factory to allocate a band matcher.
+     *
+     * @param band band object we are looking for
+     * @return matcher
+     */
+    public static MeterBandJsonMatcher matchesMeterBand(Band band) {
+        return new MeterBandJsonMatcher(band);
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.codec.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.ImmutableList;
+import org.junit.Before;
+import org.junit.Test;
+import org.onosproject.codec.JsonCodec;
+import org.onosproject.core.CoreService;
+import org.onosproject.net.NetTestTools;
+import org.onosproject.net.meter.Band;
+import org.onosproject.net.meter.DefaultBand;
+import org.onosproject.net.meter.DefaultMeter;
+import org.onosproject.net.meter.Meter;
+import org.onosproject.net.meter.MeterId;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+import static org.easymock.EasyMock.createMock;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.replay;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.onosproject.codec.impl.MeterJsonMatcher.matchesMeter;
+import static org.onosproject.net.NetTestTools.APP_ID;
+
+/**
+ * Unit tests for Meter codec.
+ */
+public class MeterCodecTest {
+
+    MockCodecContext context;
+    JsonCodec<Meter> meterCodec;
+    final CoreService mockCoreService = createMock(CoreService.class);
+
+    /**
+     * Sets up for each test.  Creates a context and fetches the flow rule
+     * codec.
+     */
+    @Before
+    public void setUp() {
+        context = new MockCodecContext();
+        meterCodec = context.codec(Meter.class);
+        assertThat(meterCodec, notNullValue());
+
+        expect(mockCoreService.registerApplication(MeterCodec.REST_APP_ID))
+                .andReturn(APP_ID).anyTimes();
+        replay(mockCoreService);
+        context.registerService(CoreService.class, mockCoreService);
+    }
+
+    /**
+     * Tests encoding of a Meter object.
+     */
+    @Test
+    public void testMeterEncode() {
+        Band band1 = DefaultBand.builder()
+                        .ofType(Band.Type.DROP)
+                        .burstSize(10)
+                        .withRate(10).build();
+        Band band2 = DefaultBand.builder()
+                        .ofType(Band.Type.REMARK)
+                        .burstSize(10)
+                        .withRate(10)
+                        .dropPrecedence((short) 10).build();
+
+        Meter meter = DefaultMeter.builder()
+                        .fromApp(APP_ID)
+                        .withId(MeterId.meterId(1L))
+                        .forDevice(NetTestTools.did("d1"))
+                        .withBands(ImmutableList.of(band1, band2))
+                        .withUnit(Meter.Unit.KB_PER_SEC).build();
+
+        ObjectNode meterJson = meterCodec.encode(meter, context);
+        assertThat(meterJson, matchesMeter(meter));
+    }
+
+    /**
+     * Test decoding of a Meter object.
+     */
+    @Test
+    public void testMeterDecode() throws IOException  {
+        Meter meter = getMeter("simple-meter.json");
+        checkCommonData(meter);
+
+        assertThat(meter.bands().size(), is(1));
+        Band band = meter.bands().iterator().next();
+        assertThat(band.type().toString(), is("REMARK"));
+        assertThat(band.rate(), is(10L));
+        assertThat(band.dropPrecedence(), is((short) 20));
+        assertThat(band.burst(), is(30L));
+    }
+
+    /**
+     * Checks that the data shared by all the resource is correct for a given meter.
+     *
+     * @param meter meter to check
+     */
+    private void checkCommonData(Meter meter) {
+        assertThat(meter.id().id(), is(1L));
+        assertThat(meter.deviceId().toString(), is("of:0000000000000001"));
+        assertThat(meter.appId(), is(APP_ID));
+        assertThat(meter.unit().toString(), is("KB_PER_SEC"));
+    }
+
+    /**
+     * Reads in a meter from the given resource and decodes it.
+     *
+     * @param resourceName resource to use to read the JSON for the rule
+     * @return decoded meter
+     * @throws IOException if processing the resource fails
+     */
+    private Meter getMeter(String resourceName) throws IOException {
+        InputStream jsonStream = MeterCodecTest.class.getResourceAsStream(resourceName);
+        JsonNode json = context.mapper().readTree(jsonStream);
+        assertThat(json, notNullValue());
+        Meter meter = meterCodec.decode((ObjectNode) json, context);
+        assertThat(meter, notNullValue());
+        return meter;
+    }
+}

+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.codec.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+import org.onosproject.net.meter.Band;
+import org.onosproject.net.meter.Meter;
+
+/**
+ * Hamcrest matcher for meters.
+ */
+public final class MeterJsonMatcher extends TypeSafeDiagnosingMatcher<JsonNode> {
+
+    private final Meter meter;
+
+    private MeterJsonMatcher(Meter meter) {
+        this.meter = meter;
+    }
+
+    @Override
+    protected boolean matchesSafely(JsonNode jsonMeter, Description description) {
+        // check id
+        String jsonMeterId = jsonMeter.get("id").asText();
+        String meterId = meter.id().toString();
+        if (!jsonMeterId.equals(meterId)) {
+            description.appendText("meter id was " + jsonMeterId);
+            return false;
+        }
+
+        // check unit
+        String jsonUnit = jsonMeter.get("unit").asText();
+        String unit = meter.unit().toString();
+        if (!jsonUnit.equals(unit)) {
+            description.appendText("unit was " + jsonUnit);
+            return false;
+        }
+
+        // check burst
+        boolean jsonBurst = jsonMeter.get("burst").asBoolean();
+        boolean burst = meter.isBurst();
+        if (jsonBurst != burst) {
+            description.appendText("isBurst was " + jsonBurst);
+            return false;
+        }
+
+        // check state
+        JsonNode jsonNodeState = jsonMeter.get("state");
+        if (jsonNodeState != null) {
+            String state = meter.state().toString();
+            if (!jsonNodeState.asText().equals(state)) {
+                description.appendText("state was " + jsonNodeState.asText());
+                return false;
+            }
+        }
+
+        // check life
+        JsonNode jsonNodeLife = jsonMeter.get("life");
+        if (jsonNodeLife != null) {
+            long life = meter.life();
+            if (jsonNodeLife.asLong() != life) {
+                description.appendText("life was " + jsonNodeLife.asLong());
+                return false;
+            }
+        }
+
+        // check bytes
+        JsonNode jsonNodeBytes = jsonMeter.get("bytes");
+        if (jsonNodeBytes != null) {
+            long bytes = meter.bytesSeen();
+            if (jsonNodeBytes.asLong() != bytes) {
+                description.appendText("bytes was " + jsonNodeBytes.asLong());
+                return false;
+            }
+        }
+
+        // check packets
+        JsonNode jsonNodePackets = jsonMeter.get("packets");
+        if (jsonNodePackets != null) {
+            long packets = meter.packetsSeen();
+            if (jsonNodePackets.asLong() != packets) {
+                description.appendText("packets was " + jsonNodePackets.asLong());
+                return false;
+            }
+        }
+
+        // check size of band array
+        JsonNode jsonBands = jsonMeter.get("bands");
+        if (jsonBands.size() != meter.bands().size()) {
+            description.appendText("bands size was " + jsonBands.size());
+            return false;
+        }
+
+        // check bands
+        for (Band band : meter.bands()) {
+            boolean bandFound = false;
+            for (int bandIndex = 0; bandIndex < jsonBands.size(); bandIndex++) {
+                MeterBandJsonMatcher bandMatcher = MeterBandJsonMatcher.matchesMeterBand(band);
+                if (bandMatcher.matches(jsonBands.get(bandIndex))) {
+                    bandFound = true;
+                    break;
+                }
+            }
+            if (!bandFound) {
+                description.appendText("band not found " + band.toString());
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText(meter.toString());
+    }
+
+    /**
+     * Factory to allocate a meter matcher.
+     *
+     * @param meter meter object we are looking for
+     * @return matcher
+     */
+    public static MeterJsonMatcher matchesMeter(Meter meter) {
+        return new MeterJsonMatcher(meter);
+    }
+}

+{
+  "id": 1,
+  "deviceId": "of:0000000000000001",
+  "unit": "KB_PER_SEC",
+  "burst": true,
+  "bands": [
+    {
+      "type": "REMARK",
+      "rate": 10,
+      "prec": 20,
+      "burstSize": 30
+    }
+  ]
+}
\ No newline at end of file

@@ -28,21 +28,22 @@ public class CoreWebApplication extends AbstractWebApplication {
     @Override
     public Set<Class<?>> getClasses() {
         return getClasses(ApiDocResource.class,
-                          ApplicationsWebResource.class,
-                          ComponentConfigWebResource.class,
-                          NetworkConfigWebResource.class,
-                          ClusterWebResource.class,
-                          DevicesWebResource.class,
-                          LinksWebResource.class,
-                          HostsWebResource.class,
-                          IntentsWebResource.class,
-                          FlowsWebResource.class,
-                          GroupsWebResource.class,
-                          TopologyWebResource.class,
-                          ConfigWebResource.class,
-                          PathsWebResource.class,
-                          StatisticsWebResource.class,
-                          MetricsWebResource.class
+                ApplicationsWebResource.class,
+                ComponentConfigWebResource.class,
+                NetworkConfigWebResource.class,
+                ClusterWebResource.class,
+                DevicesWebResource.class,
+                LinksWebResource.class,
+                HostsWebResource.class,
+                IntentsWebResource.class,
+                FlowsWebResource.class,
+                GroupsWebResource.class,
+                MetersWebResource.class,
+                TopologyWebResource.class,
+                ConfigWebResource.class,
+                PathsWebResource.class,
+                StatisticsWebResource.class,
+                MetricsWebResource.class
         );
     }
-}
+}
\ No newline at end of file

+/*
+ * Copyright 2014-2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.rest.resources;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.meter.DefaultMeterRequest;
+import org.onosproject.net.meter.Meter;
+import org.onosproject.net.meter.MeterId;
+import org.onosproject.net.meter.MeterRequest;
+import org.onosproject.net.meter.MeterService;
+import org.onosproject.rest.AbstractWebResource;
+import org.slf4j.Logger;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URI;
+import java.net.URISyntaxException;
+
+import static org.onlab.util.Tools.nullIsNotFound;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Query and program meter rules.
+ */
+@Path("meters")
+public class MetersWebResource extends AbstractWebResource {
+    private final Logger log = getLogger(getClass());
+    public static final String DEVICE_INVALID = "Invalid deviceId in meter creation request";
+
+    final MeterService meterService = get(MeterService.class);
+    final ObjectNode root = mapper().createObjectNode();
+    final ArrayNode metersNode = root.putArray("meters");
+
+    /**
+     * Returns all meters of all devices.
+     *
+     * @return array of all the meters in the system
+     * @onos.rsModel Meters
+     */
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getMeters() {
+        final Iterable<Meter> meters = meterService.getAllMeters();
+        if (meters != null) {
+            meters.forEach(meter -> metersNode.add(codec(Meter.class).encode(meter, this)));
+        }
+        return ok(root).build();
+    }
+
+    /**
+     * Returns a meter by the meter id.
+     *
+     * @param deviceId device identifier
+     * @return array of all the groups in the system
+     * @onos.rsModel Meter
+     */
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    @Path("{deviceId}/{meterId}")
+    public Response getMeterByDeviceIdAndMeterId(@PathParam("deviceId") String deviceId,
+                                                 @PathParam("meterId") String meterId) {
+        DeviceId did = DeviceId.deviceId(deviceId);
+        MeterId mid = MeterId.meterId(Long.valueOf(meterId));
+
+        final Meter meter = nullIsNotFound(meterService.getMeter(did, mid),
+                "Meter is not found for " + mid.id());
+
+        metersNode.add(codec(Meter.class).encode(meter, this));
+        return ok(root).build();
+    }
+
+    /**
+     * Create new meter rule. Creates and installs a new meter rule for the
+     * specified device.
+     *
+     * @param deviceId device identifier
+     * @param stream   meter rule JSON
+     * @return status of the request - CREATED if the JSON is correct,
+     * BAD_REQUEST if the JSON is invalid
+     * @onos.rsModel MeterPost
+     */
+    @POST
+    @Path("{deviceId}")
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response createMeter(@PathParam("deviceId") String deviceId,
+                                InputStream stream) {
+        URI location;
+        try {
+            ObjectNode jsonTree = (ObjectNode) mapper().readTree(stream);
+            JsonNode specifiedDeviceId = jsonTree.get("deviceId");
+
+            if (specifiedDeviceId != null &&
+                    !specifiedDeviceId.asText().equals(deviceId)) {
+                throw new IllegalArgumentException(DEVICE_INVALID);
+            }
+            jsonTree.put("deviceId", deviceId);
+            final Meter tmpMeter = codec(Meter.class).decode(jsonTree, this);
+            final MeterRequest meterRequest = meterToMeterRequest(tmpMeter, "ADD");
+            final Meter meter = meterService.submit(meterRequest);
+            location = new URI(Long.toString(meter.id().id()));
+        } catch (IOException | URISyntaxException ex) {
+            throw new IllegalArgumentException(ex);
+        }
+
+        return Response
+                .created(location)
+                .build();
+    }
+
+    /**
+     * Removes the specified meter.
+     *
+     * @param deviceId device identifier
+     * @param meterId  meter identifier
+     */
+    @DELETE
+    @Produces(MediaType.APPLICATION_JSON)
+    @Path("{deviceId}/{meterId}")
+    public void deleteMeterByDeviceIdAndMeterId(@PathParam("deviceId") String deviceId,
+                                                @PathParam("meterId") String meterId) {
+        DeviceId did = DeviceId.deviceId(deviceId);
+        MeterId mid = MeterId.meterId(Long.valueOf(meterId));
+        final Meter tmpMeter = meterService.getMeter(did, mid);
+        if (tmpMeter != null) {
+            final MeterRequest meterRequest = meterToMeterRequest(tmpMeter, "REMOVE");
+            meterService.withdraw(meterRequest, tmpMeter.id());
+        }
+    }
+
+    /**
+     * Convert a meter instance to meterRequest instance with a certain operation.
+     *
+     * @param meter     meter instance
+     * @param operation operation
+     * @return converted meterRequest instance
+     */
+    private MeterRequest meterToMeterRequest(Meter meter, String operation) {
+        MeterRequest.Builder builder;
+        MeterRequest meterRequest;
+
+        if (meter == null) {
+            return null;
+        }
+
+        if (meter.isBurst()) {
+            builder = DefaultMeterRequest.builder()
+                    .fromApp(meter.appId())
+                    .forDevice(meter.deviceId())
+                    .withUnit(meter.unit())
+                    .withBands(meter.bands())
+                    .burst();
+        } else {
+            builder = DefaultMeterRequest.builder()
+                    .fromApp(meter.appId())
+                    .forDevice(meter.deviceId())
+                    .withUnit(meter.unit())
+                    .withBands(meter.bands());
+        }
+
+        switch (operation) {
+            case "ADD":
+                meterRequest = builder.add();
+                break;
+            case "REMOVE":
+                meterRequest = builder.remove();
+                break;
+            default:
+                log.warn("Invalid operation {}.", operation);
+                return null;
+        }
+
+        return meterRequest;
+    }
+}
\ No newline at end of file

+{
+  "type": "object",
+  "title": "meter",
+  "required": [
+    "id",
+    "appId",
+    "deviceId",
+    "unit",
+    "burst",
+    "state",
+    "life",
+    "refCount",
+    "packets",
+    "bytes",
+    "bands"
+  ],
+  "properties": {
+    "id": {
+      "type": "string",
+      "example": "1"
+    },
+    "appId": {
+      "type": "string",
+      "example": "1"
+    },
+    "deviceId": {
+      "type": "string",
+      "example": "of:0000000000000001"
+    },
+    "unit": {
+      "type": "string",
+      "example": "KB_PER_SEC"
+    },
+    "burst": {
+      "type": "boolean",
+      "example": true
+    },
+    "state": {
+      "type": "string",
+      "example": "ADDED"
+    },
+    "life": {
+      "type": "integer",
+      "format": "int64",
+      "example": 0
+    },
+    "refCount": {
+      "type": "integer",
+      "format": "int64",
+      "example": 0
+    },
+    "packets": {
+      "type": "integer",
+      "format": "int64",
+      "example": 0
+    },
+    "bytes": {
+      "type": "integer",
+      "format": "int64",
+      "example": 0
+    },
+    "bands": {
+      "type": "array",
+      "xml": {
+        "name": "bands",
+        "wrapped": true
+      },
+      "items": {
+        "type": "object",
+        "title": "bands",
+        "required": [
+          "type",
+          "rate",
+          "burstSize",
+          "prec",
+          "packets",
+          "bytes"
+        ],
+        "properties": {
+          "type": {
+            "type": "string",
+            "example": "REMARK"
+          },
+          "rate": {
+            "type": "integer",
+            "format": "int64",
+            "example": 0
+          },
+          "burstSize": {
+            "type": "integer",
+            "format": "int64",
+            "example": 0
+          },
+          "prec": {
+            "type": "integer",
+            "format": "int16",
+            "example": 0
+          },
+          "packets": {
+            "type": "integer",
+            "format": "int64",
+            "example": 0
+          },
+          "bytes": {
+            "type": "integer",
+            "format": "int64",
+            "example": 0
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file

+{
+  "type": "object",
+  "title": "meter",
+  "required": [
+    "id",
+    "deviceId",
+    "unit",
+    "burst",
+    "bands"
+  ],
+  "properties": {
+    "id": {
+      "type": "string",
+      "example": "1"
+    },
+    "deviceId": {
+      "type": "string",
+      "example": "of:0000000000000001"
+    },
+    "unit": {
+      "type": "string",
+      "example": "KB_PER_SEC"
+    },
+    "burst": {
+      "type": "boolean",
+      "example": true
+    },
+    "bands": {
+      "type": "array",
+      "xml": {
+        "name": "bands",
+        "wrapped": true
+      },
+      "items": {
+        "type": "object",
+        "title": "bands",
+        "required": [
+          "type",
+          "rate",
+          "burstSize",
+          "prec"
+        ],
+        "properties": {
+          "type": {
+            "type": "string",
+            "example": "REMARK"
+          },
+          "rate": {
+            "type": "integer",
+            "format": "int64",
+            "example": "0"
+          },
+          "burstSize": {
+            "type": "integer",
+            "format": "int64",
+            "example": "0"
+          },
+          "prec": {
+            "type": "integer",
+            "format": "int16",
+            "example": "0"
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file

+{
+  "type": "object",
+  "title": "meters",
+  "required": [
+    "meters"
+  ],
+  "properties": {
+    "groups": {
+      "type": "array",
+      "xml": {
+        "name": "meters",
+        "wrapped": true
+      },
+      "items": {
+        "type": "object",
+        "title": "meter",
+        "required": [
+          "id",
+          "appId",
+          "deviceId",
+          "unit",
+          "burst",
+          "state",
+          "life",
+          "refCount",
+          "packets",
+          "bytes",
+          "bands"
+        ],
+        "properties": {
+          "id": {
+            "type": "string",
+            "example": "1"
+          },
+          "appId": {
+            "type": "string",
+            "example": "1"
+          },
+          "deviceId": {
+            "type": "string",
+            "example": "of:0000000000000001"
+          },
+          "unit": {
+            "type": "string",
+            "example": "KB_PER_SEC"
+          },
+          "burst": {
+            "type": "boolean",
+            "example": true
+          },
+          "state": {
+            "type": "string",
+            "example": "ADDED"
+          },
+          "life": {
+            "type": "integer",
+            "format": "int64",
+            "example": 0
+          },
+          "refCount": {
+            "type": "integer",
+            "format": "int64",
+            "example": 0
+          },
+          "packets": {
+            "type": "integer",
+            "format": "int64",
+            "example": 0
+          },
+          "bytes": {
+            "type": "integer",
+            "format": "int64",
+            "example": 0
+          },
+          "bands": {
+            "type": "array",
+            "xml": {
+              "name": "bands",
+              "wrapped": true
+            },
+            "items": {
+              "type": "object",
+              "title": "bands",
+              "required": [
+                "type",
+                "rate",
+                "burstSize",
+                "prec",
+                "packets",
+                "bytes"
+              ],
+              "properties": {
+                "type": {
+                  "type": "string",
+                  "example": "REMARK"
+                },
+                "rate": {
+                  "type": "integer",
+                  "format": "int64",
+                  "example": 0
+                },
+                "burstSize": {
+                  "type": "integer",
+                  "format": "int64",
+                  "example": 0
+                },
+                "prec": {
+                  "type": "integer",
+                  "format": "int16",
+                  "example": 0
+                },
+                "packets": {
+                  "type": "integer",
+                  "format": "int64",
+                  "example": 0
+                },
+                "bytes": {
+                  "type": "integer",
+                  "format": "int64",
+                  "example": 0
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file

+/*
+ * Copyright 2014-2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.rest;
+
+import com.eclipsesource.json.JsonArray;
+import com.eclipsesource.json.JsonObject;
+import com.google.common.collect.ImmutableSet;
+import com.sun.jersey.api.client.ClientResponse;
+import com.sun.jersey.api.client.WebResource;
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeMatcher;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.osgi.ServiceDirectory;
+import org.onlab.osgi.TestServiceDirectory;
+import org.onlab.rest.BaseResource;
+import org.onosproject.codec.CodecService;
+import org.onosproject.codec.impl.CodecManager;
+import org.onosproject.codec.impl.MeterCodec;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.core.DefaultApplicationId;
+import org.onosproject.net.DefaultDevice;
+import org.onosproject.net.Device;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.NetTestTools;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.net.meter.Band;
+import org.onosproject.net.meter.DefaultBand;
+import org.onosproject.net.meter.Meter;
+import org.onosproject.net.meter.MeterId;
+import org.onosproject.net.meter.MeterService;
+import org.onosproject.net.meter.MeterState;
+
+import javax.ws.rs.core.MediaType;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static org.easymock.EasyMock.anyObject;
+import static org.easymock.EasyMock.anyShort;
+import static org.easymock.EasyMock.createMock;
+import static org.easymock.EasyMock.expect;
+import static org.easymock.EasyMock.expectLastCall;
+import static org.easymock.EasyMock.replay;
+import static org.easymock.EasyMock.verify;
+import static org.hamcrest.Matchers.hasSize;
+import static org.hamcrest.Matchers.is;
+import static org.junit.Assert.assertThat;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.onosproject.net.NetTestTools.APP_ID;
+
+/**
+ * Unit tests for meters REST APIs.
+ */
+public class MetersResourceTest extends ResourceTest {
+    final MeterService mockMeterService = createMock(MeterService.class);
+    CoreService mockCoreService = createMock(CoreService.class);
+    final DeviceService mockDeviceService = createMock(DeviceService.class);
+
+    final HashMap<DeviceId, Set<Meter>> meters = new HashMap<>();
+
+    final DeviceId deviceId1 = DeviceId.deviceId("1");
+    final DeviceId deviceId2 = DeviceId.deviceId("2");
+    final DeviceId deviceId3 = DeviceId.deviceId("3");
+    final Device device1 = new DefaultDevice(null, deviceId1, Device.Type.OTHER,
+            "", "", "", "", null);
+    final Device device2 = new DefaultDevice(null, deviceId2, Device.Type.OTHER,
+            "", "", "", "", null);
+
+    final MockMeter meter1 = new MockMeter(deviceId1, 1, 111, 1);
+    final MockMeter meter2 = new MockMeter(deviceId1, 2, 222, 2);
+    final MockMeter meter3 = new MockMeter(deviceId2, 3, 333, 3);
+    final MockMeter meter4 = new MockMeter(deviceId2, 4, 444, 4);
+    final MockMeter meter5 = new MockMeter(deviceId3, 5, 555, 5);
+
+    /**
+     * Mock class for a meter.
+     */
+    private static class MockMeter implements Meter {
+
+        final DeviceId deviceId;
+        final ApplicationId appId;
+        final MeterId meterId;
+        final long baseValue;
+        final List<Band> bandList;
+
+        public MockMeter(DeviceId deviceId, int appId, long meterId, int id) {
+            this.deviceId = deviceId;
+            this.appId = new DefaultApplicationId(appId, String.valueOf(appId));
+            this.baseValue = id * 200;
+            this.meterId = MeterId.meterId(meterId);
+
+            Band band = DefaultBand.builder()
+                    .ofType(Band.Type.REMARK)
+                    .withRate(10)
+                    .dropPrecedence((short) 20)
+                    .burstSize(30).build();
+
+            this.bandList = new ArrayList<>();
+            this.bandList.add(band);
+        }
+
+        @Override
+        public DeviceId deviceId() {
+            return this.deviceId;
+        }
+
+        @Override
+        public MeterId id() {
+            return this.meterId;
+        }
+
+        @Override
+        public ApplicationId appId() {
+            return this.appId;
+        }
+
+        @Override
+        public Unit unit() {
+            return Unit.KB_PER_SEC;
+        }
+
+        @Override
+        public boolean isBurst() {
+            return false;
+        }
+
+        @Override
+        public Collection<Band> bands() {
+            return this.bandList;
+        }
+
+        @Override
+        public MeterState state() {
+            return MeterState.ADDED;
+        }
+
+        @Override
+        public long life() {
+            return baseValue + 11;
+        }
+
+        @Override
+        public long referenceCount() {
+            return baseValue + 22;
+        }
+
+        @Override
+        public long packetsSeen() {
+            return baseValue + 33;
+        }
+
+        @Override
+        public long bytesSeen() {
+            return baseValue + 44;
+        }
+    }
+
+    /**
+     * Populates some meters used as testing data.
+     */
+    private void setupMockMeters() {
+        final Set<Meter> meters1 = new HashSet<>();
+        meters1.add(meter1);
+        meters1.add(meter2);
+
+        final Set<Meter> meters2 = new HashSet<>();
+        meters2.add(meter3);
+        meters2.add(meter4);
+
+        meters.put(deviceId1, meters1);
+        meters.put(deviceId2, meters2);
+
+        Set<Meter> allMeters = new HashSet<>();
+        for (DeviceId deviceId : meters.keySet()) {
+            allMeters.addAll(meters.get(deviceId));
+        }
+
+        expect(mockMeterService.getAllMeters()).andReturn(allMeters).anyTimes();
+    }
+
+    /**
+     * Sets up the global values for all the tests.
+     */
+    @Before
+    public void setUpTest() {
+        // Mock device service
+        expect(mockDeviceService.getDevice(deviceId1))
+                .andReturn(device1);
+        expect(mockDeviceService.getDevice(deviceId2))
+                .andReturn(device2);
+        expect(mockDeviceService.getDevices())
+                .andReturn(ImmutableSet.of(device1, device2));
+
+        // Mock Core Service
+        expect(mockCoreService.getAppId(anyShort()))
+                .andReturn(NetTestTools.APP_ID).anyTimes();
+        expect(mockCoreService.registerApplication(MeterCodec.REST_APP_ID))
+                .andReturn(APP_ID).anyTimes();
+        replay(mockCoreService);
+
+        // Register the services needed for the test
+        final CodecManager codecService = new CodecManager();
+        codecService.activate();
+        ServiceDirectory testDirectory =
+                new TestServiceDirectory()
+                        .add(MeterService.class, mockMeterService)
+                        .add(DeviceService.class, mockDeviceService)
+                        .add(CodecService.class, codecService)
+                        .add(CoreService.class, mockCoreService);
+
+        BaseResource.setServiceDirectory(testDirectory);
+    }
+
+    /**
+     * Cleans up and verifies the mocks.
+     */
+    @After
+    public void tearDownTest() {
+        verify(mockMeterService);
+        verify(mockCoreService);
+    }
+
+    /**
+     * Hamcrest matcher to check that a meter representation in JSON matches
+     * the actual meter.
+     */
+    public static class MeterJsonMatcher extends TypeSafeMatcher<JsonObject> {
+        private final Meter meter;
+        private String reason = "";
+
+        public MeterJsonMatcher(Meter meterValue) {
+            this.meter = meterValue;
+        }
+
+        @Override
+        protected boolean matchesSafely(JsonObject jsonMeter) {
+
+            // check application id
+            final String jsonAppId = jsonMeter.get("appId").asString();
+            final String appId = meter.appId().toString();
+            if (!jsonAppId.equals(appId)) {
+                reason = "appId " + meter.appId().toString();
+                return false;
+            }
+
+            // check device id
+            final String jsonDeviceId = jsonMeter.get("deviceId").asString();
+            if (!jsonDeviceId.equals(meter.deviceId().toString())) {
+                reason = "deviceId " + meter.deviceId();
+                return false;
+            }
+
+            // check band array
+            if (meter.bands() != null) {
+                final JsonArray jsonBands = jsonMeter.get("bands").asArray();
+                if (meter.bands().size() != jsonBands.size()) {
+                    reason = "bands array size of " +
+                            Integer.toString(meter.bands().size());
+                    return false;
+                }
+                for (final Band band : meter.bands()) {
+                    boolean bandFound = false;
+                    for (int bandIndex = 0; bandIndex < jsonBands.size(); bandIndex++) {
+                        final String jsonType = jsonBands.get(bandIndex).asObject().get("type").asString();
+                        final String bandType = band.type().name();
+                        if (jsonType.equals(bandType)) {
+                            bandFound = true;
+                        }
+                    }
+                    if (!bandFound) {
+                        reason = "meter band " + band.toString();
+                        return false;
+                    }
+                }
+            }
+
+            return true;
+        }
+
+        @Override
+        public void describeTo(Description description) {
+            description.appendText(reason);
+        }
+    }
+
+    private static MeterJsonMatcher matchesMeter(Meter meter) {
+        return new MeterJsonMatcher(meter);
+    }
+
+    /**
+     * Hamcrest matcher to check that a meter is represented properly in a JSON
+     * array of meters.
+     */
+    public static class MeterJsonArrayMatcher extends TypeSafeMatcher<JsonArray> {
+        private final Meter meter;
+        private String reason = "";
+
+        public MeterJsonArrayMatcher(Meter meterValue) {
+            meter = meterValue;
+        }
+
+        @Override
+        protected boolean matchesSafely(JsonArray json) {
+            boolean meterFound = false;
+            for (int jsonMeterIndex = 0; jsonMeterIndex < json.size(); jsonMeterIndex++) {
+                final JsonObject jsonMeter = json.get(jsonMeterIndex).asObject();
+
+                final String meterId = meter.id().toString();
+                final String jsonMeterId = jsonMeter.get("id").asString();
+                if (jsonMeterId.equals(meterId)) {
+                    meterFound = true;
+
+                    assertThat(jsonMeter, matchesMeter(meter));
+                }
+            }
+            if (!meterFound) {
+                reason = "Meter with id " + meter.id().toString() + " not found";
+                return false;
+            } else {
+                return true;
+            }
+        }
+
+        @Override
+        public void describeTo(Description description) {
+            description.appendText(reason);
+        }
+    }
+
+    /**
+     * Factory to allocate a meter array matcher.
+     *
+     * @param meter meter object we are looking for
+     * @return matcher
+     */
+    private static MeterJsonArrayMatcher hasMeter(Meter meter) {
+        return new MeterJsonArrayMatcher(meter);
+    }
+
+    @Test
+    public void testMeterEmptyArray() {
+        expect(mockMeterService.getAllMeters()).andReturn(null).anyTimes();
+        replay(mockMeterService);
+        replay(mockDeviceService);
+        final WebResource rs = resource();
+        final String response = rs.path("meters").get(String.class);
+        assertThat(response, is("{\"meters\":[]}"));
+    }
+
+    /**
+     * Tests the result of the rest api GET when there are active meters.
+     */
+    @Test
+    public void testMetersPopulatedArray() {
+        setupMockMeters();
+        replay(mockMeterService);
+        replay(mockDeviceService);
+        final WebResource rs = resource();
+        final String response = rs.path("meters").get(String.class);
+        final JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, notNullValue());
+
+        assertThat(result.names(), hasSize(1));
+        assertThat(result.names().get(0), is("meters"));
+        final JsonArray jsonMeters = result.get("meters").asArray();
+        assertThat(jsonMeters, notNullValue());
+        assertThat(jsonMeters, hasMeter(meter1));
+        assertThat(jsonMeters, hasMeter(meter2));
+        assertThat(jsonMeters, hasMeter(meter3));
+        assertThat(jsonMeters, hasMeter(meter4));
+    }
+
+    /**
+     * Tests the result of a rest api GET for a device.
+     */
+    @Test
+    public void testMeterSingleDeviceWithId() {
+        setupMockMeters();
+
+        expect(mockMeterService.getMeter(anyObject(), anyObject()))
+                .andReturn(meter5).anyTimes();
+        replay(mockMeterService);
+        replay(mockDeviceService);
+
+        final WebResource rs = resource();
+        final String response = rs.path("meters/" + deviceId3.toString()
+                + "/" + meter5.id().id()).get(String.class);
+        final JsonObject result = JsonObject.readFrom(response);
+        assertThat(result, notNullValue());
+
+        assertThat(result.names(), hasSize(1));
+        assertThat(result.names().get(0), is("meters"));
+        final JsonArray jsonFlows = result.get("meters").asArray();
+        assertThat(jsonFlows, notNullValue());
+        assertThat(jsonFlows, hasMeter(meter5));
+    }
+
+    /**
+     * Tests creating a meter with POST.
+     */
+    @Test
+    public void testPost() {
+        mockMeterService.submit(anyObject());
+        expectLastCall().andReturn(meter5).anyTimes();
+        replay(mockMeterService);
+
+        WebResource rs = resource();
+        InputStream jsonStream = MetersResourceTest.class
+                .getResourceAsStream("post-meter.json");
+
+        ClientResponse response = rs.path("meters/of:0000000000000001")
+                .type(MediaType.APPLICATION_JSON_TYPE)
+                .post(ClientResponse.class, jsonStream);
+        assertThat(response.getStatus(), is(HttpURLConnection.HTTP_CREATED));
+    }
+
+    /**
+     * Tests deleting a meter.
+     */
+    @Test
+    public void testDelete() {
+        setupMockMeters();
+        expect(mockMeterService.getMeter(anyObject(), anyObject()))
+                .andReturn(meter5).anyTimes();
+        mockMeterService.withdraw(anyObject(), anyObject());
+        expectLastCall();
+        replay(mockMeterService);
+
+        WebResource rs = resource();
+
+        String location = "/meters/3/555";
+
+        ClientResponse deleteResponse = rs.path(location)
+                .type(MediaType.APPLICATION_JSON_TYPE)
+                .delete(ClientResponse.class);
+        assertThat(deleteResponse.getStatus(),
+                is(HttpURLConnection.HTTP_NO_CONTENT));
+    }
+}

+{
+  "id": 1,
+  "deviceId": "of:0000000000000001",
+  "unit": "KB_PER_SEC",
+  "bands": [
+    {
+      "type": "REMARK",
+      "rate": 10,
+      "prec": 20,
+      "burstSize": 30
+    }
+  ]
+}
\ No newline at end of file