1 files changed, 157 insertions, 0 deletions
diff --git a/appc-client/client-lib/src/main/java/org/onap/appc/client/impl/protocol/AsyncProtocolImpl.java b/appc-client/client-lib/src/main/java/org/onap/appc/client/impl/protocol/AsyncProtocolImpl.java
new file mode 100644
index 000000000..82626d802
--- /dev/null
+++ b/appc-client/client-lib/src/main/java/org/onap/appc/client/impl/protocol/AsyncProtocolImpl.java
@@ -0,0 +1,157 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP : APPC
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Copyright (C) 2017 Amdocs
+ * =============================================================================
+ * 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.
+ * 
+ * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.appc.client.impl.protocol;
+
+import org.onap.appc.client.impl.core.MessageContext;
+import com.att.eelf.configuration.EELFLogger;
+import com.att.eelf.configuration.EELFManager;
+
+import java.io.IOException;
+import java.security.GeneralSecurityException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Properties;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+class AsyncProtocolImpl implements AsyncProtocol {
+
+    /**
+     * message bus listener thread handler
+     */
+    private Future listenerHandler;
+    /**
+     * called when messages are fetched - called for a single message
+     */
+    private RetrieveMessageCallback callback;
+    /**
+     * message bus client used to send/fetch
+     */
+    private MessagingService messageService;
+    /**
+     * Message reader used to extract body and context from reponse message
+     */
+    private MessageReader messageReader;
+    /**
+     * Message writer used to construct meesage from body and context
+     */
+    private MessageWriter messageWriter;
+
+    /**
+     * shutdown indicator
+     */
+    private boolean isShutdown = false;
+
+    /**
+     * executor service for listener usage
+     */
+    private ExecutorService executorService = Executors.newSingleThreadExecutor();
+
+    private final EELFLogger LOG = EELFManager.getInstance().getLogger(AsyncProtocolImpl.class);
+
+
+    AsyncProtocolImpl() {
+
+        messageService = new UEBMessagingService();
+        messageReader = new APPCMessageReaderWriter();
+        messageWriter = (MessageWriter) messageReader;
+    }
+
+    public void init(Properties props, RetrieveMessageCallback callback) throws ProtocolException {
+
+        if (callback == null) {
+            throw new ProtocolException("Callback param should not be null!");
+        }
+        this.callback = callback;
+
+        try {
+            messageService.init(props);
+            //get message bus listener thread
+            //start the thread after initializing services
+            listenerHandler = executorService.submit(new Listener());
+        } catch (GeneralSecurityException | IllegalAccessException | NoSuchFieldException | IOException e) {
+            throw new ProtocolException(e);
+        }
+    }
+
+    public void sendRequest(String payload, MessageContext context) throws ProtocolException {
+
+        //get message to be sent to appc from payload and context
+        String message = messageWriter.write(payload, context);
+        try {
+            messageService.send(context.getPartiton(), message);
+            LOG.debug("Successfully send message: " + message);
+        } catch (IOException e) {
+            throw new ProtocolException(e);
+        }
+    }
+
+    @Override
+    public void shutdown() {
+        isShutdown = true;
+        messageService.close();
+        LOG.warn("The protocol layer in shutdown stage.");
+        executorService.shutdownNow();
+    }
+
+    public class Listener implements Runnable {
+
+
+        public void run() {
+
+            while (!isShutdown) {
+                List<String> messages = new ArrayList<>();
+                try {
+                    messages = messageService.fetch();
+                    LOG.debug("Successfully fetched " + messages.size() + " messages");
+                } catch (IOException e) {
+                    LOG.error("Fetching " + messages.size() + " messages failed");
+                }
+                for (String message : messages) {
+
+                    MessageContext context = new MessageContext();
+                    String payload = null;
+
+                    try {
+                        //get payload and context from message to be sent to core layer
+                        payload = messageReader.read(message, context);
+                        LOG.debug("Got body: " + payload);
+                        //call core layer response handler
+                        if(!isShutdown) {
+                            callback.onResponse(payload, context);
+                        }else{
+                            LOG.warn("Shutdown in progress, response will not receive. Correlation ID <" +
+                                    context.getCorrelationID() + "> response ", message);
+                        }
+                    } catch (ProtocolException e) {
+                        LOG.error("Failed to read message from UEB. message is: " + message);
+                    }
+                }
+            }
+        }
+    }
+
+}