dmaap-listener/src/main/java/org/openecomp/sdnc/dmaapclient/SdncDmaapConsumer.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * openECOMP : SDN-C
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights
   6  *                                              reserved.
   7  * ================================================================================
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  * ============LICENSE_END=========================================================
  20  */
  21
  22 package org.openecomp.sdnc.dmaapclient;
  23
  24 import java.io.File;
  25 import java.io.FileInputStream;
  26 import java.util.Properties;
  27
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 import com.att.nsa.mr.client.MRClientFactory;
  32 import com.att.nsa.mr.client.MRConsumer;
  33 import com.att.nsa.mr.client.response.MRConsumerResponse;
  34
  35 public abstract class SdncDmaapConsumer implements Runnable {
  36
  37         private static final Logger LOG = LoggerFactory
  38                         .getLogger(SdncDmaapConsumer.class);
  39
  40         private String propertiesPath = "";
  41         private Properties properties = null;
  42         MRConsumer consumer = null;
  43         MRConsumerResponse consumerResponse = null;
  44         boolean running = false;
  45         boolean ready = false;
  46         int fetchPause = 5000; // Default pause between fetchs - 5 seconds
  47
  48         public boolean isReady() {
  49                 return ready;
  50         }
  51
  52         int timeout = 15000; // Default timeout - 15 seconds
  53
  54         public boolean isRunning() {
  55                 return running;
  56         }
  57
  58         public SdncDmaapConsumer() {
  59
  60         }
  61
  62         public SdncDmaapConsumer(Properties properties, String propertiesPath) {
  63                 init(properties, propertiesPath);
  64         }
  65
  66         public String getProperty(String name) {
  67                 return(properties.getProperty(name, ""));
  68         }
  69
  70         public void init(Properties properties, String propertiesPath) {
  71
  72                 this.propertiesPath = propertiesPath;
  73
  74                 try {
  75
  76                         this.properties = (Properties) properties.clone();
  77
  78                         this.properties.load(new FileInputStream(new File(propertiesPath)));
  79
  80                         String timeoutStr = properties.getProperty("timeout");
  81
  82                         if ((timeoutStr != null) && (timeoutStr.length() > 0)) {
  83                                 try {
  84                                         timeout = Integer.parseInt(timeoutStr);
  85                                 } catch (NumberFormatException e) {
  86                                         LOG.error("Non-numeric value specified for timeout ("+timeoutStr+")");
  87                                 }
  88                         }
  89
  90                         String fetchPauseStr = properties.getProperty("fetchPause");
  91                         if ((fetchPauseStr != null) && (fetchPauseStr.length() > 0)) {
  92                                 try {
  93                                         fetchPause = Integer.parseInt(fetchPauseStr);
  94                                 } catch (NumberFormatException e) {
  95                                         LOG.error("Non-numeric valud specified for fetchPause ("+fetchPauseStr+")");
  96                                 }
  97                         }
  98
  99                         this.consumer = MRClientFactory.createConsumer(propertiesPath);
 100                         ready = true;
 101                 } catch (Exception e) {
 102                         LOG.error("Error initializing DMaaP consumer from file "+propertiesPath, e);
 103                 }
 104         }
 105
 106
 107         @Override
 108         public void run() {
 109                 if (ready) {
 110
 111                         running = true;
 112
 113                         while (running) {
 114
 115                                 try {
 116                                         boolean noData = true;
 117                                         consumerResponse = consumer.fetchWithReturnConsumerResponse(timeout, -1);
 118                                         for (String msg : consumerResponse.getActualMessages()) {
 119                                                 noData = false;
 120                                                 LOG.info("Received message from DMaaP:\n"+msg);
 121                                                 processMsg(msg);
 122                                         }
 123
 124                                         if (noData) {
 125                                                 if (fetchPause > 0) {
 126
 127                                                         LOG.info("No data received from fetch.  Pausing "+fetchPause+" ms before retry");
 128                                                         Thread.sleep(fetchPause);
 129                                                 } else {
 130
 131                                                         LOG.info("No data received from fetch.  No fetch pause specified - retrying immediately");
 132                                                 }
 133                                         }
 134                                 } catch (Exception e) {
 135                                         LOG.error("Caught exception reading from DMaaP", e);
 136                                         running = false;
 137                                 }
 138
 139
 140                         }
 141                 }
 142
 143         }
 144
 145         abstract public void processMsg(String msg) throws InvalidMessageException;
 146 }