Add pooling capability

[policy/drools-pdp.git] / feature-pooling-dmaap / src / main / java / org / onap / policy / drools / pooling / Serializer.java

diff --git a/feature-pooling-dmaap/src/main/java/org/onap/policy/drools/pooling/Serializer.java b/feature-pooling-dmaap/src/main/java/org/onap/policy/drools/pooling/Serializer.java
new file mode 100644 (file)
index 0000000..63aefb7
--- /dev/null
+++ b/feature-pooling-dmaap/src/main/java/org/onap/policy/drools/pooling/Serializer.java
@@ -0,0 +1,79 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP
+ * ================================================================================
+ * Copyright (C) 2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.drools.pooling;
+
+import java.io.IOException;
+import java.util.Map;
+import org.onap.policy.drools.pooling.message.Message;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * Serialization helper functions.
+ */
+public class Serializer {
+
+    /**
+     * Used to encode & decode JSON messages sent & received, respectively, on
+     * the internal DMaaP topic.
+     */
+    private final ObjectMapper mapper = new ObjectMapper();
+
+    /**
+     * 
+     */
+    public Serializer() {
+        super();
+    }
+
+    /**
+     * Encodes a filter.
+     * 
+     * @param filter filter to be encoded
+     * @return the filter, serialized as a JSON string
+     * @throws JsonProcessingException if it cannot be serialized
+     */
+    public String encodeFilter(Map<String, Object> filter) throws JsonProcessingException {
+        return mapper.writeValueAsString(filter);
+    }
+
+    /**
+     * Encodes a message.
+     * 
+     * @param msg message to be encoded
+     * @return the message, serialized as a JSON string
+     * @throws JsonProcessingException if it cannot be serialized
+     */
+    public String encodeMsg(Message msg) throws JsonProcessingException {
+        return mapper.writeValueAsString(msg);
+    }
+
+    /**
+     * Decodes a JSON string into a Message.
+     * 
+     * @param msg JSON string representing the message
+     * @return the message
+     * @throws IOException if it cannot be serialized
+     */
+    public Message decodeMsg(String msg) throws IOException {
+        return mapper.readValue(msg, Message.class);
+    }
+}