[VOL-3148] Only one meter creation is attempted for a given bandwidth profile.
Achieved through coordination of subscribers and meters.

Change-Id: I0377633a4ff5f34e817ec53382431d4a74d974c1
diff --git a/app/src/main/java/org/opencord/olt/impl/SubscriberFlowInfo.java b/app/src/main/java/org/opencord/olt/impl/SubscriberFlowInfo.java
new file mode 100644
index 0000000..f923b83
--- /dev/null
+++ b/app/src/main/java/org/opencord/olt/impl/SubscriberFlowInfo.java
@@ -0,0 +1,187 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * 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.opencord.olt.impl;
+
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.PortNumber;
+import org.onosproject.net.meter.MeterId;
+import org.opencord.sadis.UniTagInformation;
+
+import java.util.Objects;
+
+/**
+ * Contains the mapping of a given port to flow information, including bandwidth profile.
+ */
+class SubscriberFlowInfo {
+    private final DeviceId devId;
+    private final PortNumber nniPort;
+    private final PortNumber uniPort;
+    private final UniTagInformation tagInfo;
+    private MeterId downId;
+    private MeterId upId;
+    private final String downBpInfo;
+    private final String upBpInfo;
+
+    /**
+     * Builds the mapper of information.
+     * @param devId the device id
+     * @param nniPort the nni port
+     * @param uniPort the uni port
+     * @param tagInfo the tag info
+     * @param downId the downstream meter id
+     * @param upId the upstream meter id
+     * @param downBpInfo the downstream bandwidth profile
+     * @param upBpInfo the upstream bandwidth profile
+     */
+    SubscriberFlowInfo(DeviceId devId, PortNumber nniPort, PortNumber uniPort,
+                       UniTagInformation tagInfo, MeterId downId, MeterId upId,
+                       String downBpInfo, String upBpInfo) {
+        this.devId = devId;
+        this.nniPort = nniPort;
+        this.uniPort = uniPort;
+        this.tagInfo = tagInfo;
+        this.downId = downId;
+        this.upId = upId;
+        this.downBpInfo = downBpInfo;
+        this.upBpInfo = upBpInfo;
+    }
+
+    /**
+     * Gets the device id of this subscriber and flow information.
+     *
+     * @return device id
+     */
+    DeviceId getDevId() {
+        return devId;
+    }
+
+    /**
+     * Gets the nni of this subscriber and flow information.
+     *
+     * @return nni port
+     */
+    PortNumber getNniPort() {
+        return nniPort;
+    }
+
+    /**
+     * Gets the uni port of this subscriber and flow information.
+     *
+     * @return uni port
+     */
+    PortNumber getUniPort() {
+        return uniPort;
+    }
+
+    /**
+     * Gets the tag of this subscriber and flow information.
+     *
+     * @return tag of the subscriber
+     */
+    UniTagInformation getTagInfo() {
+        return tagInfo;
+    }
+
+    /**
+     * Gets the downstream meter id of this subscriber and flow information.
+     *
+     * @return downstream meter id
+     */
+    MeterId getDownId() {
+        return downId;
+    }
+
+    /**
+     * Gets the upstream meter id of this subscriber and flow information.
+     *
+     * @return upstream meter id
+     */
+    MeterId getUpId() {
+        return upId;
+    }
+
+    /**
+     * Gets the downstream bandwidth profile of this subscriber and flow information.
+     *
+     * @return downstream bandwidth profile
+     */
+    String getDownBpInfo() {
+        return downBpInfo;
+    }
+
+    /**
+     * Gets the upstream bandwidth profile of this subscriber and flow information.
+     *
+     * @return upstream bandwidth profile.
+     */
+    String getUpBpInfo() {
+        return upBpInfo;
+    }
+
+    /**
+     * Sets the upstream meter id.
+     * @param upMeterId the upstream meter id
+     */
+    void setUpMeterId(MeterId upMeterId) {
+        this.upId = upMeterId;
+    }
+
+    /**
+     * Sets the downstream meter id.
+     * @param downMeterId the downstream meter id
+     */
+    void setDownMeterId(MeterId downMeterId) {
+        this.downId = downMeterId;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        SubscriberFlowInfo flowInfo = (SubscriberFlowInfo) o;
+        return devId.equals(flowInfo.devId) &&
+                nniPort.equals(flowInfo.nniPort) &&
+                uniPort.equals(flowInfo.uniPort) &&
+                tagInfo.equals(flowInfo.tagInfo) &&
+                downId.equals(flowInfo.downId) &&
+                upId.equals(flowInfo.upId) &&
+                downBpInfo.equals(flowInfo.downBpInfo) &&
+                upBpInfo.equals(flowInfo.upBpInfo);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(devId, nniPort, uniPort, tagInfo, downId, upId, downBpInfo, upBpInfo);
+    }
+
+    @Override
+    public String toString() {
+        return com.google.common.base.MoreObjects.toStringHelper(this)
+                .add("devId", devId)
+                .add("nniPort", nniPort)
+                .add("uniPort", uniPort)
+                .add("tagInfo", tagInfo)
+                .add("downId", downId)
+                .add("upId", upId)
+                .add("downBpInfo", downBpInfo)
+                .add("upBpInfo", upBpInfo)
+                .toString();
+    }
+}