Java tutorial
/* * Copyright 2012 Amazon.com, 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 * * http://aws.amazon.com/apache2.0 * * 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 org.systemsbiology.common; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.util.Properties; import org.apache.log4j.BasicConfigurator; import org.apache.log4j.Level; import org.apache.log4j.Logger; import com.amazonaws.ClientConfiguration; import com.amazonaws.auth.AWSCredentials; import com.amazonaws.auth.BasicAWSCredentials; import com.amazonaws.services.s3.AmazonS3; import com.amazonaws.services.s3.AmazonS3Client; import com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflow; import com.amazonaws.services.simpleworkflow.AmazonSimpleWorkflowClient; /** * Configuration Helper to used to create SWF and S3 clients */ public class ConfigHelper { private Properties sampleConfig; private String swfServiceUrl; private String swfAccessId; private String swfSecretKey; private String s3AccessId; private String s3SecretKey; private String domain; private long domainRetentionPeriodinDays; private ConfigHelper(File propertiesFile) throws IOException { loadProperties(propertiesFile); } private void loadProperties(File propertiesFile) throws IOException { FileInputStream inputStream = new FileInputStream(propertiesFile); sampleConfig = new Properties(); sampleConfig.load(inputStream); this.swfServiceUrl = sampleConfig.getProperty(ConfigKeys.SWF_SERVICE_URL_KEY); this.swfAccessId = sampleConfig.getProperty(ConfigKeys.SWF_ACCESS_ID_KEY); this.swfSecretKey = sampleConfig.getProperty(ConfigKeys.SWF_SECRET_KEY_KEY); this.s3AccessId = sampleConfig.getProperty(ConfigKeys.S3_ACCESS_ID_KEY); this.s3SecretKey = sampleConfig.getProperty(ConfigKeys.S3_SECRET_KEY_KEY); this.domain = sampleConfig.getProperty(ConfigKeys.DOMAIN_KEY); } public static ConfigHelper createConfig() throws IOException, IllegalArgumentException { BasicConfigurator.configure(); Logger.getRootLogger().setLevel(Level.INFO); ConfigHelper configHelper = null; boolean envVariableExists = false; //first check the existence of environment variable String sampleConfigPath = System.getenv(SampleConstants.ACCESS_PROPERTIES_ENVIRONMENT_VARIABLE); if (sampleConfigPath != null && sampleConfigPath.length() > 0) { envVariableExists = true; } File accessProperties = new File(System.getProperty(SampleConstants.HOME_DIRECTORY_PROPERTY), SampleConstants.HOME_DIRECTORY_FILENAME); if (accessProperties.exists()) { configHelper = new ConfigHelper(accessProperties); } else if (envVariableExists) { accessProperties = new File(sampleConfigPath, SampleConstants.ACCESS_PROPERTIES_FILENAME); configHelper = new ConfigHelper(accessProperties); } else { //try checking the existence of file on relative path. try { accessProperties = new File(SampleConstants.ACCESS_PROPERTIES_RELATIVE_PATH, SampleConstants.ACCESS_PROPERTIES_FILENAME); configHelper = new ConfigHelper(accessProperties); } catch (Exception e) { throw new FileNotFoundException( "Cannot find AWS_SWF_SAMPLES_CONFIG environment variable, Exiting!!!"); } } return configHelper; } public AmazonSimpleWorkflow createSWFClient() { ClientConfiguration config = new ClientConfiguration().withSocketTimeout(70 * 1000); AWSCredentials awsCredentials = new BasicAWSCredentials(this.swfAccessId, this.swfSecretKey); AmazonSimpleWorkflow client = new AmazonSimpleWorkflowClient(awsCredentials, config); client.setEndpoint(this.swfServiceUrl); return client; } public AmazonS3 createS3Client() { AWSCredentials s3AWSCredentials = new BasicAWSCredentials(this.s3AccessId, this.s3SecretKey); AmazonS3 client = new AmazonS3Client(s3AWSCredentials); return client; } public String getDomain() { return domain; } public long getDomainRetentionPeriodInDays() { return domainRetentionPeriodinDays; } public String getValueFromConfig(String key) { return sampleConfig.getProperty(key); } }