AWS Code Sample
Catalog demonstrates how to use notifications to track the status of a job.

/* * Copyright 2010-2019, Inc. or its affiliates. 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. * A copy of the License is located at * * * * 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; import java.util.ArrayList; import java.util.List; import; import; import; import; import; import; import; import; import; import; import; /** * The purpose of this sample is to show how job status notifications can be * used to receive job status updates using an event-driven model. Using * notifications allows you to track job status of transcoding jobs in a * scalable fashion. * * Note that this implementation will not scale to multiple machines because * the provided JobStatusNotificationHandler is looking for a specific job ID. * If there are multiple machines polling SQS for notifications, there is no * guarantee that a particular machine will receive a particular notification. * * More information about notifications can be found in the Elastic Transcoder * documentation: * */ public class JobStatusNotificationsSample { // This is the ID of the Elastic Transcoder pipeline that was created when // setting up your AWS environment: // private static final String PIPELINE_ID = "Enter your pipeline id here."; // This is the URL of the SQS queue that was created when setting up your // AWS environment. // private static final String SQS_QUEUE_URL = "Enter your queue url here."; // This is the name of the input key that you would like to transcode. private static final String INPUT_KEY = "Enter your input key here."; // This will generate a 480p 16:9 mp4 output. private static final String PRESET_ID = "1351620000001-000020"; // All outputs will have this prefix prepended to their output key. private static final String OUTPUT_KEY_PREFIX = "elastic-transcoder-samples/output/"; // Clients are built using the default credentials provider chain. This // will attempt to get your credentials in the following order: // 1. Environment variables (AWS_ACCESS_KEY and AWS_SECRET_KEY). // 2. Java system properties ( // 3. Instance profile credentials on EC2 instances. private static final AmazonSQS amazonSqs = new AmazonSQSClient(); private static final AmazonElasticTranscoder amazonElasticTranscoder = new AmazonElasticTranscoderClient(); public static void main(String[] args) throws Exception { // Setup our notification worker. SqsQueueNotificationWorker sqsQueueNotificationWorker = new SqsQueueNotificationWorker(amazonSqs, SQS_QUEUE_URL); Thread notificationThread = new Thread(sqsQueueNotificationWorker); notificationThread.start(); // Create a job in Elastic Transcoder. String jobId = createElasticTranscoderJob(); // Wait for the job we created to complete. System.out.println("Waiting for job to complete: " + jobId); waitForJobToComplete(jobId, sqsQueueNotificationWorker); } /** * Creates a job in Elastic Transcoder using the configured pipeline, input * key, preset, and output key prefix. * @return Job ID of the job that was created in Elastic Transcoder. * @throws Exception */ private static String createElasticTranscoderJob() throws Exception { // Setup the job input using the provided input key. JobInput input = new JobInput() .withKey(INPUT_KEY); // Setup the job output using the provided input key to generate an output key. List<CreateJobOutput> outputs = new ArrayList<CreateJobOutput>(); CreateJobOutput output = new CreateJobOutput() .withKey(TranscoderSampleUtilities.inputKeyToOutputKey(INPUT_KEY)) .withPresetId(PRESET_ID); outputs.add(output); // Create a job on the specified pipeline and return the job ID. CreateJobRequest createJobRequest = new CreateJobRequest() .withPipelineId(PIPELINE_ID) .withOutputKeyPrefix(OUTPUT_KEY_PREFIX) .withInput(input) .withOutputs(outputs); return amazonElasticTranscoder.createJob(createJobRequest).getJob().getId(); } /** * Waits for the specified job to complete by adding a handler to the SQS * notification worker that is polling for status updates. This method * will block until the specified job completes. * @param jobId * @param sqsQueueNotificationWorker * @throws InterruptedException */ private static void waitForJobToComplete(final String jobId, SqsQueueNotificationWorker sqsQueueNotificationWorker) throws InterruptedException { // Create a handler that will wait for this specific job to complete. JobStatusNotificationHandler handler = new JobStatusNotificationHandler() { @Override public void handle(JobStatusNotification jobStatusNotification) { if (jobStatusNotification.getJobId().equals(jobId)) { System.out.println(jobStatusNotification); if (jobStatusNotification.getState().isTerminalState()) { synchronized(this) { this.notifyAll(); } } } } }; sqsQueueNotificationWorker.addHandler(handler); // Wait for job to complete. synchronized(handler) { handler.wait(); } // When job completes, shutdown the sqs notification worker. sqsQueueNotificationWorker.shutdown(); } }

Sample Details

Service: elastictranscoder

Author: AWS

Type: full-example

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