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/**
 * Copyright (c) 2005-2015 Zauber S.A. 
 *
 * Licensed 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 ar.com.zauber.commons.async;

import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;

import org.apache.commons.lang.Validate;

/**
 * Implementation of {@link WaitableExecutor} that delegate on others {@link Executor}.
 * 
 * @author Juan F. Codagnone
 * @since Mar 11, 2011
 */
public class DelegateTaskExecutor extends AbstractAsyncTaskExecutor implements WaitableExecutor {
    private final ExecutorService executorService;

    /**
     * @param executorService executor service user to delegate.
     */
    public DelegateTaskExecutor(final ExecutorService executorService) {
        Validate.notNull(executorService);
        
        this.executorService = executorService;
    }
    
    
    public List shutdownNow() {
        return executorService.shutdownNow();
    }

    @Override
    public void execute(final Runnable command) {
        incrementActiveJobs();
        
        try {
            executorService.execute(new Runnable() {
                
                @Override
                public void run() {
                    try {
                        command.run();
                    } finally {
                        decrementActiveJobs();
                    }
                    
                }
            });
        } catch(final Exception e){
            // only on error we decrement.
            decrementActiveJobs();
        }
    }
    
}