Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License 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 org.apache.camel.component.aws.swf; import com.amazonaws.ClientConfiguration; import com.amazonaws.auth.AWSCredentials; import com.amazonaws.auth.BasicAWSCredentials; import com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflowClient; import com.amazonaws.services.simpleworkflow.flow.StartWorkflowOptions; import org.apache.camel.Consumer; import org.apache.camel.Exchange; import org.apache.camel.ExchangePattern; import org.apache.camel.Processor; import org.apache.camel.Producer; import org.apache.camel.impl.DefaultEndpoint; import org.apache.camel.util.EndpointHelper; import org.apache.camel.util.ExchangeHelper; /** * Defines the <a href="http://aws.amazon.com/swf/">Amazon Simple Workflow Endpoint</a> */ public class SWFEndpoint extends DefaultEndpoint { private SWFConfiguration configuration; private AmazonSimpleWorkflowClient amazonSWClient; public SWFEndpoint() { } public SWFEndpoint(String uri, SWFComponent component, SWFConfiguration configuration) { super(uri, component); this.configuration = configuration; } public Producer createProducer() throws Exception { return isWorkflow() ? new SWFWorkflowProducer(this, new CamelSWFWorkflowClient(this, configuration)) : new SWFActivityProducer(this, new CamelSWFActivityClient(configuration)); } public Consumer createConsumer(Processor processor) throws Exception { return isWorkflow() ? new SWFWorkflowConsumer(this, processor, configuration) : new SWFActivityConsumer(this, processor, configuration); } public boolean isSingleton() { return true; } @Override protected void doStart() throws Exception { if (configuration.getAmazonSWClient() == null) { amazonSWClient = createSWClient(); } super.doStart(); } @Override protected void doStop() throws Exception { if (amazonSWClient != null) { amazonSWClient.shutdown(); amazonSWClient = null; } super.doStop(); } public AmazonSimpleWorkflowClient getSWClient() { return configuration.getAmazonSWClient() != null ? configuration.getAmazonSWClient() : amazonSWClient; } private AmazonSimpleWorkflowClient createSWClient() throws Exception { AWSCredentials credentials = new BasicAWSCredentials(configuration.getAccessKey(), configuration.getSecretKey()); ClientConfiguration clientConfiguration = new ClientConfiguration(); if (!configuration.getClientConfigurationParameters().isEmpty()) { setProperties(clientConfiguration, configuration.getClientConfigurationParameters()); } AmazonSimpleWorkflowClient client = new AmazonSimpleWorkflowClient(credentials, clientConfiguration); if (!configuration.getsWClientParameters().isEmpty()) { setProperties(client, configuration.getsWClientParameters()); } return client; } public StartWorkflowOptions getStartWorkflowOptions() { StartWorkflowOptions startWorkflowOptions = new StartWorkflowOptions(); try { EndpointHelper.setReferenceProperties(getCamelContext(), startWorkflowOptions, configuration.getStartWorkflowOptionsParameters()); EndpointHelper.setProperties(getCamelContext(), startWorkflowOptions, configuration.getStartWorkflowOptionsParameters()); } catch (Exception e) { throw new RuntimeException(e); } return startWorkflowOptions; } private boolean isWorkflow() { return configuration.getType().equalsIgnoreCase("workflow"); } public Exchange createExchange(Object request, String action) { Exchange exchange = createExchange(ExchangePattern.InOut); exchange.getIn().setBody(request); exchange.getIn().setHeader(SWFConstants.ACTION, action); return exchange; } public Object getResult(Exchange exchange) { return ExchangeHelper.isOutCapable(exchange) ? exchange.getOut().getBody() : exchange.getIn().getBody(); } public void setResult(Exchange exchange, Object result) { if (ExchangeHelper.isOutCapable(exchange)) { exchange.getOut().setBody(result); } else { exchange.getIn().setBody(result); } } public void setConfiguration(SWFConfiguration configuration) { this.configuration = configuration; } public SWFConfiguration getConfiguration() { return configuration; } }