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/*-
* ============LICENSE_START=======================================================
* policy-endpoints
* ================================================================================
* Copyright (C) 2017 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.event.comm.bus.internal;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.onap.policy.drools.event.comm.TopicListener;
import org.onap.policy.drools.event.comm.bus.BusTopicSource;
/**
* This topic source implementation specializes in reading messages
* over a bus topic source and notifying its listeners
*/
public abstract class SingleThreadedBusTopicSource
extends BusTopicBase
implements Runnable, BusTopicSource {
/**
* Not to be converted to PolicyLogger.
* This will contain all instract /out traffic and only that in a single file in a concise format.
*/
private static Logger logger = LoggerFactory.getLogger(InlineBusTopicSink.class);
private static final Logger netLogger = LoggerFactory.getLogger(NETWORK_LOGGER);
/**
* Bus consumer group
*/
protected final String consumerGroup;
/**
* Bus consumer instance
*/
protected final String consumerInstance;
/**
* Bus fetch timeout
*/
protected final int fetchTimeout;
/**
* Bus fetch limit
*/
protected final int fetchLimit;
/**
* Message Bus Consumer
*/
protected BusConsumer consumer;
/**
* Am I running?
* reflects invocation of start()/stop()
* !locked & start() => alive
* stop() => !alive
*/
protected volatile boolean alive = false;
/**
* Independent thread reading message over my topic
*/
protected Thread busPollerThread;
/**
* All my subscribers for new message notifications
*/
protected final ArrayList<TopicListener> topicListeners = new ArrayList<TopicListener>();
/**
*
* @param servers Bus servers
* @param topic Bus Topic to be monitored
* @param apiKey Bus API Key (optional)
* @param apiSecret Bus API Secret (optional)
* @param consumerGroup Bus Reader Consumer Group
* @param consumerInstance Bus Reader Instance
* @param fetchTimeout Bus fetch timeout
* @param fetchLimit Bus fetch limit
* @param useHttps does the bus use https
* @param allowSelfSignedCerts are self-signed certificates allowed
* @throws IllegalArgumentException An invalid parameter passed in
*/
public SingleThreadedBusTopicSource(List<String> servers,
String topic,
String apiKey,
String apiSecret,
String consumerGroup,
String consumerInstance,
int fetchTimeout,
int fetchLimit,
boolean useHttps,
boolean allowSelfSignedCerts)
throws IllegalArgumentException {
super(servers, topic, apiKey, apiSecret, useHttps, allowSelfSignedCerts);
if (consumerGroup == null || consumerGroup.isEmpty()) {
this.consumerGroup = UUID.randomUUID ().toString();
} else {
this.consumerGroup = consumerGroup;
}
if (consumerInstance == null || consumerInstance.isEmpty()) {
this.consumerInstance = DEFAULT_CONSUMER_INSTANCE;
} else {
this.consumerInstance = consumerInstance;
}
if (fetchTimeout <= 0) {
this.fetchTimeout = NO_TIMEOUT_MS_FETCH;
} else {
this.fetchTimeout = fetchTimeout;
}
if (fetchLimit <= 0) {
this.fetchLimit = NO_LIMIT_FETCH;
} else {
this.fetchLimit = fetchLimit;
}
}
/**
* Initialize the Bus client
*/
public abstract void init() throws Exception;
@Override
public void register(TopicListener topicListener)
throws IllegalArgumentException {
super.register(topicListener);
try {
if (!alive && !locked)
this.start();
else
logger.info("{}: register: start not attempted", this);
} catch (Exception e) {
logger.warn("{}: cannot start after registration of because of: {}",
this, topicListener, e.getMessage(), e);
}
}
@Override
public void unregister(TopicListener topicListener) {
boolean stop = false;
synchronized (this) {
super.unregister(topicListener);
stop = (this.topicListeners.isEmpty());
}
if (stop) {
this.stop();
}
}
@Override
public boolean start() throws IllegalStateException {
logger.info("{}: starting", this);
synchronized(this) {
if (alive)
return true;
if (locked)
throw new IllegalStateException(this + " is locked.");
if (this.busPollerThread == null ||
!this.busPollerThread.isAlive() ||
this.consumer == null) {
try {
this.init();
this.alive = true;
this.busPollerThread = new Thread(this);
this.busPollerThread.setName(this.getTopicCommInfrastructure() + "-source-" + this.getTopic());
busPollerThread.start();
} catch (Exception e) {
logger.warn("{}: cannot start because of {}", this, e.getMessage(), e);
throw new IllegalStateException(e);
}
}
}
return this.alive;
}
@Override
public boolean stop() {
logger.info("{}: stopping", this);
synchronized(this) {
BusConsumer consumerCopy = this.consumer;
this.alive = false;
this.consumer = null;
if (consumerCopy != null) {
try {
consumerCopy.close();
} catch (Exception e) {
logger.warn("{}: stop failed because of {}", this, e.getMessage(), e);
}
}
}
Thread.yield();
return true;
}
/**
* Run thread method for the Bus Reader
*/
@Override
public void run() {
while (this.alive) {
try {
for (String event: this.consumer.fetch()) {
synchronized (this) {
this.recentEvents.add(event);
}
netLogger.info("[IN|{}|{}]{}{}",
this.getTopicCommInfrastructure(), this.topic,
System.lineSeparator(), event);
broadcast(event);
if (!this.alive)
break;
}
} catch (Exception e) {
logger.error("{}: cannot fetch because of ", this, e.getMessage(), e);
}
}
logger.info("{}: exiting thread", this);
}
/**
* {@inheritDoc}
*/
@Override
public boolean offer(String event) {
if (!this.alive) {
throw new IllegalStateException(this + " is not alive.");
}
synchronized (this) {
this.recentEvents.add(event);
}
netLogger.info("[IN|{}|{}]{}{}",this.getTopicCommInfrastructure(),this.topic,
System.lineSeparator(), event);
return broadcast(event);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("SingleThreadedBusTopicSource [consumerGroup=").append(consumerGroup)
.append(", consumerInstance=").append(consumerInstance).append(", fetchTimeout=").append(fetchTimeout)
.append(", fetchLimit=").append(fetchLimit)
.append(", consumer=").append(this.consumer).append(", alive=")
.append(alive).append(", locked=").append(locked).append(", uebThread=").append(busPollerThread)
.append(", topicListeners=").append(topicListeners.size()).append(", toString()=").append(super.toString())
.append("]");
return builder.toString();
}
/**
* {@inheritDoc}
*/
@Override
public boolean isAlive() {
return alive;
}
/**
* {@inheritDoc}
*/
@Override
public String getConsumerGroup() {
return consumerGroup;
}
/**
* {@inheritDoc}
*/
@Override
public String getConsumerInstance() {
return consumerInstance;
}
/**
* {@inheritDoc}
*/
@Override
public void shutdown() throws IllegalStateException {
this.stop();
this.topicListeners.clear();
}
/**
* {@inheritDoc}
*/
@Override
public int getFetchTimeout() {
return fetchTimeout;
}
/**
* {@inheritDoc}
*/
@Override
public int getFetchLimit() {
return fetchLimit;
}
}
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