[ONOS-7683] Add JSON codecs for FlowInfo and StatsInfo with tests

Change-Id: I12560e5f72e704a72a59465de347ddb32051aabb
diff --git a/apps/openstacktelemetry/app/src/main/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegister.java b/apps/openstacktelemetry/app/src/main/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegister.java
new file mode 100644
index 0000000..30737ac
--- /dev/null
+++ b/apps/openstacktelemetry/app/src/main/java/org/onosproject/openstacktelemetry/web/OpenstackTelemetryCodecRegister.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2018-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.onosproject.openstacktelemetry.web;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onosproject.codec.CodecService;
+import org.onosproject.openstacktelemetry.api.FlowInfo;
+import org.onosproject.openstacktelemetry.api.StatsInfo;
+import org.onosproject.openstacktelemetry.codec.FlowInfoJsonCodec;
+import org.onosproject.openstacktelemetry.codec.StatsInfoJsonCodec;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Implementation of the JSON codec brokering service for OpenstackTelemetry.
+ */
+@Component(immediate = true)
+public class OpenstackTelemetryCodecRegister {
+
+    private final org.slf4j.Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CodecService codecService;
+
+    @Activate
+    protected void activate() {
+        codecService.registerCodec(StatsInfo.class, new StatsInfoJsonCodec());
+        codecService.registerCodec(FlowInfo.class, new FlowInfoJsonCodec());
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        codecService.unregisterCodec(StatsInfo.class);
+        codecService.unregisterCodec(FlowInfo.class);
+
+        log.info("Stopped");
+    }
+}