/*
* Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.mediator.datamapper.engine.core.executors;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import static org.wso2.carbon.mediator.datamapper.engine.utils.DataMapperEngineConstants
.DEFAULT_DATAMAPPER_ENGINE_POOL_SIZE;
/**
* This class act as a factory to get the requested script executor
*/
public class ScriptExecutorFactory {
private static ScriptExecutorPool executorPool = null;
private static ScriptExecutorType scriptExecutorType = ScriptExecutorType.NASHORN;
private static final Log log = LogFactory.getLog(ScriptExecutorFactory.class);
/**
* This private constructor added to hide the implicit public constructor
*/
private ScriptExecutorFactory() {
}
/**
* This method will return the script executor according to the given {@link
* ScriptExecutorType}
*
* @return script executor
*/
public static Executor getScriptExecutor(String executorPoolSize) throws InterruptedException {
if (executorPool == null) {
initializeExecutorPool(executorPoolSize);
}
return executorPool.take();
}
/**
* Initialize a script executors pool. If Java8, use Nashorn as the script engine or if Java7
* or 6 use Rhino
* which is the default javascript engine provided in Java
*
* @param executorPoolSizeStr size of the executor pool
*/
private synchronized static void initializeExecutorPool(String executorPoolSizeStr) {
if (executorPool == null) {
String javaVersion = System.getProperty("java.version");
if (javaVersion.startsWith("1.7") || javaVersion.startsWith("1.6")) {
scriptExecutorType = ScriptExecutorType.RHINO;
log.debug("Script Engine set to Rhino");
} else {
log.debug("Script Engine set to Nashorn");
}
int executorPoolSize = DEFAULT_DATAMAPPER_ENGINE_POOL_SIZE;
if (executorPoolSizeStr != null) {
executorPoolSize = Integer.parseInt(executorPoolSizeStr);
log.debug("Script executor pool size set to " + executorPoolSize);
} else {
log.debug("Using default script executor pool size " + executorPoolSize);
}
executorPool = new ScriptExecutorPool(scriptExecutorType, executorPoolSize);
}
}
/**
* This method will release the script executor to the pool
*/
public static void releaseScriptExecutor(Executor executor) throws InterruptedException {
executorPool.put(executor);
}
}