modules/gfac/gfac-core/src/main/java/org/apache/airavata/gfac/core/GFacThreadPoolExecutor.java

/**
 *
 * 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.airavata.gfac.core;

import org.apache.airavata.common.exception.ApplicationSettingsException;
import org.apache.airavata.common.utils.ServerSettings;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class GFacThreadPoolExecutor {
    private final static Logger logger = LoggerFactory.getLogger(GFacThreadPoolExecutor.class);
    public static final String GFAC_THREAD_POOL_SIZE = "gfac.thread.pool.size";

    private static ExecutorService threadPool;

    public static ExecutorService getCachedThreadPool() {
        if(threadPool ==null){
            threadPool = Executors.newCachedThreadPool();
        }
        return threadPool;
    }

    public static ExecutorService client() throws ApplicationSettingsException {
        if(threadPool ==null){
            try {
                threadPool = Executors.newFixedThreadPool(Integer.parseInt(ServerSettings.getSetting(GFAC_THREAD_POOL_SIZE)));
            } catch (ApplicationSettingsException e) {
                logger.error("Error reading " + GFAC_THREAD_POOL_SIZE+ " property");
                throw e;
            }
        }
        return threadPool;
    }


}