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/*
 * Copyright 2012 International Business Machines Corp.
 * 
 * See the NOTICE file distributed with this work for additional information
 * regarding copyright ownership. 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 com.ibm.jbatch.container.services.impl;

import java.util.concurrent.CancellationException;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.ibm.jbatch.container.exception.BatchContainerServiceException;
import com.ibm.jbatch.spi.services.ParallelTaskResult;

/*
 * An adapter class for a Future object so we can wait for parallel threads/steps/flows to finish before continuing 
 */
public class JSEResultAdapter implements ParallelTaskResult {

    private final static String sourceClass = JSEResultAdapter.class.getName();
    private final static Logger logger = Logger.getLogger(sourceClass);
    
    private Future result;
    
    public JSEResultAdapter(Future result) {
        this.result = result;
    }

    @Override
    public void waitForResult() {
        try {
            result.get();
        } catch (InterruptedException e) {
            throw new BatchContainerServiceException("Parallel thread was interrupted while waiting for result.", e);
        } catch (ExecutionException e) {
            //We will handle this case through a failed batch status. We will not propagate the exception
            //through the entire thread.
            if (logger.isLoggable(Level.FINE)) {
                logger.fine(sourceClass + ": caught exception/error: " + e.getMessage() + " : Stack trace: " + e.getCause().toString());
            }
            
        } catch (CancellationException e) {
            throw new BatchContainerServiceException("Parallel thread was canceled before completion.", e);
        }

    }


}