hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/LSMInvertedIndexFlushOperation.java

/*
 * Copyright 2009-2012 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.invertedindex.impls;

import java.util.Collections;
import java.util.Set;

import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
import edu.uci.ics.hyracks.api.io.FileReference;
import edu.uci.ics.hyracks.api.io.IODeviceHandle;
import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperation;
import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallback;
import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexAccessorInternal;

public class LSMInvertedIndexFlushOperation implements ILSMIOOperation {
    private final ILSMIndexAccessorInternal accessor;
    private final LSMInvertedIndexMutableComponent flushingComponent;
    private final FileReference dictBTreeFlushTarget;
    private final FileReference deletedKeysBTreeFlushTarget;
    private final ILSMIOOperationCallback callback;

    public LSMInvertedIndexFlushOperation(ILSMIndexAccessorInternal accessor,
            LSMInvertedIndexMutableComponent flushingComponent, FileReference dictBTreeFlushTarget,
            FileReference deletedKeysBTreeFlushTarget, ILSMIOOperationCallback callback) {
        this.accessor = accessor;
        this.flushingComponent = flushingComponent;
        this.dictBTreeFlushTarget = dictBTreeFlushTarget;
        this.deletedKeysBTreeFlushTarget = deletedKeysBTreeFlushTarget;
        this.callback = callback;
    }

    @Override
    public Set<IODeviceHandle> getReadDevices() {
        return Collections.emptySet();
    }

    @Override
    public Set<IODeviceHandle> getWriteDevices() {
        return Collections.singleton(dictBTreeFlushTarget.getDeviceHandle());
    }

    @Override
    public void perform() throws HyracksDataException, IndexException {
        accessor.flush(this);
    }

    @Override
    public ILSMIOOperationCallback getCallback() {
        return callback;
    }

    public FileReference getDictBTreeFlushTarget() {
        return dictBTreeFlushTarget;
    }

    public FileReference getDeletedKeysBTreeFlushTarget() {
        return deletedKeysBTreeFlushTarget;
    }

    public LSMInvertedIndexMutableComponent getFlushingComponent() {
        return flushingComponent;
    }
}