hyracks/hyracks-storage-am-lsm-btree/src/main/java/org/apache/hyracks/storage/am/lsm/btree/dataflow/ExternalBTreeDataflowHelper.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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package org.apache.hyracks.storage.am.lsm.btree.dataflow;

import java.util.List;

import org.apache.hyracks.api.context.IHyracksTaskContext;
import org.apache.hyracks.api.exceptions.HyracksDataException;
import org.apache.hyracks.storage.am.common.api.IIndex;
import org.apache.hyracks.storage.am.common.api.ITreeIndex;
import org.apache.hyracks.storage.am.common.dataflow.AbstractTreeIndexOperatorDescriptor;
import org.apache.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
import org.apache.hyracks.storage.am.lsm.btree.util.LSMBTreeUtils;
import org.apache.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackFactory;
import org.apache.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
import org.apache.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
import org.apache.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerProvider;
import org.apache.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;

public class ExternalBTreeDataflowHelper extends LSMBTreeDataflowHelper {

    private final int version;

    public ExternalBTreeDataflowHelper(IIndexOperatorDescriptor opDesc, IHyracksTaskContext ctx, int partition,
            double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
            ILSMOperationTrackerProvider opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
            ILSMIOOperationCallbackFactory ioOpCallbackFactory, boolean needKeyDupCheck, int version, boolean durable) {
        super(opDesc, ctx, partition, null, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler,
                ioOpCallbackFactory, false, null, null, null, null, durable);
        this.version = version;
    }

    public ExternalBTreeDataflowHelper(IIndexOperatorDescriptor opDesc, IHyracksTaskContext ctx, int partition,
            List<IVirtualBufferCache> virtualBufferCaches, ILSMMergePolicy mergePolicy,
            ILSMOperationTrackerProvider opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
            ILSMIOOperationCallbackFactory ioOpCallbackFactory, boolean needKeyDupCheck, int version, boolean durable) {
        this(opDesc, ctx, partition, DEFAULT_BLOOM_FILTER_FALSE_POSITIVE_RATE, mergePolicy, opTrackerFactory,
                ioScheduler, ioOpCallbackFactory, needKeyDupCheck, version, durable);
    }

    @Override
    public IIndex getIndexInstance() {
        synchronized (lcManager) {
            if (index == null) {
                try {
                    index = lcManager.getIndex(resourcePath);
                } catch (HyracksDataException e) {
                    return null;
                }
            }
        }
        return index;
    }

    @Override
    public ITreeIndex createIndexInstance() throws HyracksDataException {
        AbstractTreeIndexOperatorDescriptor treeOpDesc = (AbstractTreeIndexOperatorDescriptor) opDesc;
        return LSMBTreeUtils.createExternalBTree(file, opDesc.getStorageManager().getBufferCache(ctx), opDesc
                .getStorageManager().getFileMapProvider(ctx), treeOpDesc.getTreeIndexTypeTraits(), treeOpDesc
                .getTreeIndexComparatorFactories(), treeOpDesc.getTreeIndexBloomFilterKeyFields(),
                bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory.getOperationTracker(ctx), ioScheduler,
                ioOpCallbackFactory.createIOOperationCallback(), getVersion(), durable);
    }

    public int getVersion() {
        return version;
    }
}