Java tutorial
/* * Copyright 2013-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * Licensed under the Amazon Software License (the "License"). * You may not use this file except in compliance with the License. * A copy of the License is located at * * http://aws.amazon.com/asl/ * * or in the "license" file accompanying this file. This file 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. */ package gov.pnnl.cloud; import gov.pnnl.cloud.StatisticsCollection.Key; import java.io.FileInputStream; import java.io.IOException; import java.net.InetAddress; import java.util.Properties; import java.util.UUID; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.amazonaws.AmazonClientException; import com.amazonaws.auth.AWSCredentialsProvider; import com.amazonaws.auth.InstanceProfileCredentialsProvider; import com.amazonaws.auth.profile.ProfileCredentialsProvider; import com.amazonaws.services.kinesis.clientlibrary.interfaces.IRecordProcessorFactory; import com.amazonaws.services.kinesis.clientlibrary.lib.worker.InitialPositionInStream; import com.amazonaws.services.kinesis.clientlibrary.lib.worker.KinesisClientLibConfiguration; import com.amazonaws.services.kinesis.clientlibrary.lib.worker.Worker; /** * Sample Kinesis Application. */ public final class KinesisApplication { private static final String DEFAULT_APP_NAME = "SampleKinesisApplication2"; private static final String DEFAULT_KINESIS_ENDPOINT = "eu-west-1"; // Initial position in the stream when the application starts up for the first time. // Position can be one of LATEST (most recent data) or TRIM_HORIZON (oldest available data) private static final InitialPositionInStream DEFAULT_INITIAL_POSITION = InitialPositionInStream.TRIM_HORIZON; private static String applicationName = DEFAULT_APP_NAME; private static String streamName; private static String kinesisEndpoint = DEFAULT_KINESIS_ENDPOINT; private static InitialPositionInStream initialPositionInStream = DEFAULT_INITIAL_POSITION; private static String kafkaBrokerList; private static KinesisClientLibConfiguration kinesisClientLibConfiguration; private static final Log LOG = LogFactory.getLog(KinesisApplication.class); /** * */ private KinesisApplication() { super(); } /** * @param args Property file with config overrides (e.g. application name, stream name) * @throws IOException Thrown if we can't read properties from the specified properties file */ public static void main(String[] args) throws IOException { String propertiesFile = null; if (args.length > 1) { System.err.println("Usage: java " + KinesisApplication.class.getName() + " <propertiesFile>"); System.exit(1); } else if (args.length == 1) { propertiesFile = args[0]; } configure(propertiesFile); System.out.println("Starting " + applicationName); LOG.info("Running " + applicationName + " to process stream " + streamName); StatisticsCollection stats = new StatisticsCollection(); StatisticsCollectionOutput statsOut = new StatisticsCollectionOutput(30000, stats); stats.setStatValue(Key.APPLICATION_START, System.currentTimeMillis()); statsOut.start(); IRecordProcessorFactory recordProcessorFactory = new KinesisRecordProcessorFactory(kafkaBrokerList, stats); Worker worker = new Worker(recordProcessorFactory, kinesisClientLibConfiguration); int exitCode = 0; try { worker.run(); } catch (Throwable t) { LOG.error("Caught throwable while processing data.", t); exitCode = 1; } System.exit(exitCode); } private static void configure(String propertiesFile) throws IOException { if (propertiesFile != null) { loadProperties(propertiesFile); } // ensure the JVM will refresh the cached IP values of AWS resources (e.g. service endpoints). java.security.Security.setProperty("networkaddress.cache.ttl", "60"); String workerId = InetAddress.getLocalHost().getCanonicalHostName() + ":" + UUID.randomUUID(); LOG.info("Using workerId: " + workerId); // Get credentials from IMDS. If unsuccessful, get them from the credential profiles file. AWSCredentialsProvider credentialsProvider = null; try { credentialsProvider = new InstanceProfileCredentialsProvider(); // Verify we can fetch credentials from the provider credentialsProvider.getCredentials(); LOG.info("Obtained credentials from the IMDS."); } catch (AmazonClientException e) { LOG.info("Unable to obtain credentials from the IMDS, trying classpath properties", e); credentialsProvider = new ProfileCredentialsProvider(); // Verify we can fetch credentials from the provider credentialsProvider.getCredentials(); LOG.info("Obtained credentials from the properties file."); } LOG.info("Using credentials with access key id: " + credentialsProvider.getCredentials().getAWSAccessKeyId()); kinesisClientLibConfiguration = new KinesisClientLibConfiguration(applicationName, streamName, credentialsProvider, workerId).withInitialPositionInStream(initialPositionInStream) .withRegionName(kinesisEndpoint); } /** * @param propertiesFile * @throws IOException Thrown when we run into issues reading properties */ private static void loadProperties(String propertiesFile) throws IOException { FileInputStream inputStream = new FileInputStream(propertiesFile); Properties properties = new Properties(); try { properties.load(inputStream); } finally { inputStream.close(); } String appNameOverride = properties.getProperty(ConfigKeys.APPLICATION_NAME_KEY); if (appNameOverride != null) { applicationName = appNameOverride; } LOG.info("Using application name " + applicationName); String streamNameOverride = properties.getProperty(ConfigKeys.STREAM_NAME_KEY); if (streamNameOverride != null) { streamName = streamNameOverride; } LOG.info("Using stream name " + streamName); String kinesisEndpointOverride = properties.getProperty(ConfigKeys.KINESIS_ENDPOINT_KEY); if (kinesisEndpointOverride != null) { kinesisEndpoint = kinesisEndpointOverride; } LOG.info("Using Kinesis endpoint " + kinesisEndpoint); String initialPositionOverride = properties.getProperty(ConfigKeys.INITIAL_POSITION_IN_STREAM_KEY); if (initialPositionOverride != null) { initialPositionInStream = InitialPositionInStream.valueOf(initialPositionOverride); } LOG.info("Using initial position " + initialPositionInStream.toString() + " (if a checkpoint is not found)."); String kafkaBrokerListProperty = properties.getProperty(ConfigKeys.KAFKA_BROKER_LIST); if (kafkaBrokerListProperty == null) { throw new IOException("kafkaBrokerList cannot be null"); } kafkaBrokerList = kafkaBrokerListProperty; LOG.info("Using Kafka broker list " + kafkaBrokerList); } }