hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/BlockingIOOperationCallbackWrapper.java

/*
 * Copyright 2009-2013 by The Regents of the University of California
 * 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 from
 * 
 *     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 edu.uci.ics.hyracks.storage.am.lsm.common.impls;

import java.util.List;

import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponent;
import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallback;

public class BlockingIOOperationCallbackWrapper implements ILSMIOOperationCallback {

    private boolean notified = false;

    private final ILSMIOOperationCallback wrappedCallback;

    public BlockingIOOperationCallbackWrapper(ILSMIOOperationCallback callback) {
        this.wrappedCallback = callback;
    }

    public synchronized void waitForIO() throws InterruptedException {
        if (!notified) {
            this.wait();
        }
        notified = false;
    }

    @Override
    public void beforeOperation() throws HyracksDataException {
        wrappedCallback.beforeOperation();
    }

    @Override
    public void afterOperation(List<ILSMComponent> oldComponents, ILSMComponent newComponent)
            throws HyracksDataException {
        wrappedCallback.afterOperation(oldComponents, newComponent);
    }

    @Override
    public synchronized void afterFinalize(ILSMComponent newComponent) throws HyracksDataException {
        wrappedCallback.afterFinalize(newComponent);
        this.notifyAll();
        notified = true;
    }
}