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/*-
* ============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);
}
}
}
}
}
}
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