Enable to query the control metrics from remote node

Change-Id: Ifef1c6eafd7cc79ed99be51f7faa26d97aeb2f67
diff --git a/apps/cpman/api/src/main/java/org/onosproject/cpman/ControlMetricsRequest.java b/apps/cpman/api/src/main/java/org/onosproject/cpman/ControlMetricsRequest.java
new file mode 100644
index 0000000..8ee505a
--- /dev/null
+++ b/apps/cpman/api/src/main/java/org/onosproject/cpman/ControlMetricsRequest.java
@@ -0,0 +1,174 @@
+/*
+ * Copyright 2016-present 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.cpman;
+
+import com.google.common.base.MoreObjects;
+import org.onosproject.net.DeviceId;
+
+import java.util.Objects;
+import java.util.Optional;
+import java.util.concurrent.TimeUnit;
+
+import static com.google.common.base.MoreObjects.toStringHelper;
+
+/**
+ * A container class that is used to request control metric of remote node.
+ */
+public class ControlMetricsRequest {
+    private final ControlMetricType type;
+    private Optional<DeviceId> deviceId;
+    private String resourceName;
+    private int duration;
+    private TimeUnit unit;
+
+    /**
+     * Instantiates a new control metric request of the control metric type and
+     * device identifier.
+     *
+     * @param type     control metric type
+     * @param deviceId device identifier
+     */
+    public ControlMetricsRequest(ControlMetricType type, Optional<DeviceId> deviceId) {
+        this.type = type;
+        this.deviceId = deviceId;
+    }
+
+    /**
+     * Instantiates a new control metric request of the control metric type and
+     * device identifier with the given projected time range.
+     *
+     * @param type     control metric type
+     * @param duration projected time duration
+     * @param unit     projected time unit
+     * @param deviceId device dientifer
+     */
+    public ControlMetricsRequest(ControlMetricType type, int duration, TimeUnit unit,
+                                 Optional<DeviceId> deviceId) {
+        this.type = type;
+        this.deviceId = deviceId;
+        this.duration = duration;
+        this.unit = unit;
+    }
+
+    /**
+     * Instantiates a new control metric request of the control metric type and
+     * resource name.
+     *
+     * @param type         control metric type
+     * @param resourceName resource name
+     */
+    public ControlMetricsRequest(ControlMetricType type, String resourceName) {
+        this.type = type;
+        this.resourceName = resourceName;
+    }
+
+    /**
+     * Instantiates a new control metric request of the control metric type and
+     * resource name with the given projected time range.
+     *
+     * @param type         control metric type
+     * @param duration     projected time duration
+     * @param unit         projected time unit
+     * @param resourceName resource name
+     */
+    public ControlMetricsRequest(ControlMetricType type, int duration, TimeUnit unit,
+                                 String resourceName) {
+        this.type = type;
+        this.resourceName = resourceName;
+        this.duration = duration;
+        this.unit = unit;
+    }
+
+    /**
+     * Obtains control metric type.
+     *
+     * @return control metric type
+     */
+    public ControlMetricType getType() {
+        return type;
+    }
+
+    /**
+     * Obtains resource name.
+     *
+     * @return resource name
+     */
+    public String getResourceName() {
+        return resourceName;
+    }
+
+    /**
+     * Obtains device identifier.
+     *
+     * @return device identifier
+     */
+    public Optional<DeviceId> getDeviceId() {
+        return deviceId;
+    }
+
+    /**
+     * Obtains projected time duration.
+     *
+     * @return projected time duration
+     */
+    public int getDuration() {
+        return duration;
+    }
+
+    /**
+     * Obtains projected time unit.
+     *
+     * @return projected time unit
+     */
+    public TimeUnit getUnit() {
+        return unit;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(type, deviceId, resourceName, duration, unit.toString());
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof ControlMetricsRequest) {
+            final ControlMetricsRequest other = (ControlMetricsRequest) obj;
+            return Objects.equals(this.type, other.type) &&
+                    Objects.equals(this.deviceId, other.deviceId) &&
+                    Objects.equals(this.resourceName, other.resourceName) &&
+                    Objects.equals(this.duration, other.duration) &&
+                    Objects.equals(this.unit, other.unit);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        MoreObjects.ToStringHelper helper;
+        helper = toStringHelper(this)
+                .add("type", type)
+                .add("resourceName", resourceName)
+                .add("duration", duration)
+                .add("timeUnit", unit);
+        if (deviceId != null) {
+            helper.add("deviceId", deviceId.get());
+        }
+        return helper.toString();
+    }
+}