2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
21 package org.onap.so.client.dmaap;
23 import com.google.common.base.Stopwatch;
24 import java.io.IOException;
25 import java.util.concurrent.TimeUnit;
26 import org.onap.so.client.dmaap.exceptions.DMaaPConsumerFailure;
27 import org.onap.so.client.dmaap.exceptions.ExceededMaximumPollingTime;
28 import org.onap.so.client.dmaap.rest.RestConsumer;
30 public abstract class DmaapConsumer extends DmaapClient {
32 public DmaapConsumer() throws IOException {
33 super("dmaap/default-consumer.properties");
36 public Consumer getConsumer() {
37 return new RestConsumer(this.properties);
40 public boolean consume() throws Exception {
41 Consumer mrConsumer = this.getConsumer();
42 boolean accepted = false;
43 Stopwatch stopwatch = Stopwatch.createUnstarted();
45 while (this.continuePolling()) {
46 if (stopwatch.elapsed(TimeUnit.MILLISECONDS) >= this.getMaximumElapsedTime()) {
47 final String message =
48 "exceeded maximum retries on " + this.getRequestId() + " on " + this.getTopic();
49 logger.error(message);
50 throw new ExceededMaximumPollingTime(message);
53 Iterable<String> itr = mrConsumer.fetch();
55 for (String message : itr) {
56 if (!accepted && this.isAccepted(message)) {
57 logger.info("accepted message found for " + this.getRequestId() + " on " + this.getTopic());
61 logger.info("received dmaap message: " + message);
62 if (this.isFailure(message)) {
63 this.stopProcessingMessages();
64 final String errorMsg = "failure received from dmaap topic " + this.getTopic();
65 logger.error(errorMsg);
66 throw new DMaaPConsumerFailure(errorMsg);
68 this.processMessage(message);
75 if (stopwatch.isRunning()) {
82 * Should this consumer continue to consume messages from the topic?
86 public abstract boolean continuePolling();
89 * Process a message from a DMaaP topic
94 public abstract void processMessage(String message) throws Exception;
97 * Has the request been accepted by the receiving system? Should the consumer move to processing messages?
102 public abstract boolean isAccepted(String message);
105 * has the request failed?
110 public abstract boolean isFailure(String message);
113 * The request id to filter messages on
117 public abstract String getRequestId();
120 * Logic that defines when the consumer should stop processing messages
122 public abstract void stopProcessingMessages();
125 * time in milliseconds
127 public int getMaximumElapsedTime() {