2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Copyright (C) 2017 Amdocs
8 * =============================================================================
9 * Licensed under the Apache License, Version 2.0 (the "License");
10 * you may not use this file except in compliance with the License.
11 * You may obtain a copy of the License at
13 * http://www.apache.org/licenses/LICENSE-2.0
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
21 * ============LICENSE_END=========================================================
24 package org.onap.appc.listener;
26 import java.security.SecureRandom;
27 import java.util.concurrent.ArrayBlockingQueue;
28 import java.util.concurrent.BlockingQueue;
29 import java.util.concurrent.RejectedExecutionHandler;
30 import java.util.concurrent.ThreadPoolExecutor;
31 import java.util.concurrent.TimeUnit;
32 import java.util.concurrent.atomic.AtomicBoolean;
34 import org.apache.commons.lang3.concurrent.BasicThreadFactory;
35 import org.onap.appc.listener.impl.EventHandlerImpl;
37 import com.att.eelf.configuration.EELFLogger;
38 import com.att.eelf.configuration.EELFManager;
40 public abstract class AbstractListener implements Listener {
42 private final EELFLogger LOG = EELFManager.getInstance().getLogger(AbstractListener.class);
44 protected AtomicBoolean run = new AtomicBoolean(false);
45 protected int QUEUED_MIN = 1;
46 protected int QUEUED_MAX = 10;
47 protected int THREAD_MIN = 4;
48 protected int THREAD_MAX = THREAD_MIN; // Fixed thread pool
49 protected int THREAD_SCALE_DOWN_SEC = 10; // Number of seconds to wait until we remove idle threads
50 protected ThreadPoolExecutor executor;
51 protected EventHandler dmaap;
52 protected ListenerProperties props;
54 private String listenerId;
56 public AbstractListener(ListenerProperties props) {
57 updateProperties(props);
59 dmaap = new EventHandlerImpl(props);
60 if (dmaap.getClientId().equals("0")) {
61 dmaap.setClientId(String.valueOf(new SecureRandom().nextInt(1000)));
64 BlockingQueue<Runnable> threadQueue = new ArrayBlockingQueue<Runnable>(QUEUED_MAX + QUEUED_MIN + 1);
65 executor = new ThreadPoolExecutor(THREAD_MIN, THREAD_MAX, THREAD_SCALE_DOWN_SEC, TimeUnit.SECONDS, threadQueue,
66 new JobRejectionHandler());
68 // Custom Named thread factory
69 BasicThreadFactory threadFactory = new BasicThreadFactory.Builder().namingPattern("DMaaP-Worker-%d").build();
70 executor.setThreadFactory(threadFactory);
76 * Starts a loop that will only end after stop() or stopNow() are called. The loop will read messages off the DMaaP
77 * topic and perform some action on them while writing messages back to DMaaP at critical points in the execution.
78 * Inherited from Runnable.
80 * @see java.lang.Runnable#run()
84 LOG.error("Listener.run() has not been implemented");
90 LOG.info(String.format("Stopping with %d messages in queue", executor.getQueue().size()));
93 executor.awaitTermination(10, TimeUnit.SECONDS);
94 } catch (InterruptedException e) {
95 LOG.error("Listener graceful stop() failed", e);
98 // close DMaaP clients
100 dmaap.closeClients();
102 LOG.info("Listener Thread Pool Finished");
106 public void stopNow() {
108 LOG.info(String.format("StopNow called. Orphaning %d messages in the queue", executor.getQueue().size()));
109 executor.getQueue().clear();
114 public String getBenchmark() {
115 return String.format("%s - No benchmarking implemented.", getListenerId());
119 public String getListenerId() {
123 // Sets the id of the listener in
125 public void setListenerId(String id) {
129 private void updateProperties(ListenerProperties properties) {
130 this.props = properties;
132 Integer.valueOf(props.getProperty(ListenerProperties.KEYS.THREADS_MIN_QUEUE, String.valueOf(QUEUED_MIN)));
134 Integer.valueOf(props.getProperty(ListenerProperties.KEYS.THREADS_MAX_QUEUE, String.valueOf(QUEUED_MAX)));
136 Integer.valueOf(props.getProperty(ListenerProperties.KEYS.THREADS_MIN_POOL, String.valueOf(THREAD_MIN)));
138 Integer.valueOf(props.getProperty(ListenerProperties.KEYS.THREADS_MAX_POOL, String.valueOf(THREAD_MAX)));
140 listenerId = props.getPrefix();
144 * This class will be used to handle what happens when we cannot add a job because of a ThreadPool issue. It does
145 * not get invoked if there is any fault with the job. NOTE: So far, this has only been seen when doing a
146 * {@link Listener#stopNow}
149 class JobRejectionHandler implements RejectedExecutionHandler {
151 public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
152 LOG.error(String.format("A job was rejected. [%s]", r));