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/**
 * Copyright (C) 2014 Dasasian ([email protected])
 *
 * 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.dasasian.chok.testutil.mockito;

import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

public class PauseAnswer implements Answer {

    private final T _returnValue;
    private volatile boolean _executionStarted;
    private volatile boolean _pauseCanceled;
    private Exception _resumeException;

    public PauseAnswer(T returnValue) {
        _returnValue = returnValue;
    }

    @Override
    public synchronized T answer(InvocationOnMock invocation) throws Throwable {
        notifyAll();// for joinExecutionBegin
        _executionStarted = true;
        if (!_pauseCanceled) {
            wait();
        }
        if (_resumeException != null) {
            throw _resumeException;
        }
        return _returnValue;
    }

    public synchronized void joinExecutionBegin() {
        try {
            if (!_executionStarted) {
                wait();
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public synchronized void resumeExecution(boolean cancelAllFurtherPauses) {
        notifyAll();
        _executionStarted = false;
        if (cancelAllFurtherPauses) {
            _pauseCanceled = true;
        }
    }

    public void resumeExecutionWithException(boolean cancelAllFurtherPauses, Exception resumeException) {
        _resumeException = resumeException;
        resumeExecution(cancelAllFurtherPauses);
    }

}