io.hops.transaction.lock.BlockRelatedLock.java Source code

Introduction

Here is the source code for io.hops.transaction.lock.BlockRelatedLock.java

Source

/*
 * Copyright (C) 2015 hops.io.
 *
 * 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 io.hops.transaction.lock;

import io.hops.metadata.common.FinderType;
import io.hops.metadata.hdfs.entity.CorruptReplica;
import io.hops.metadata.hdfs.entity.ExcessReplica;
import io.hops.metadata.hdfs.entity.IndexedReplica;
import io.hops.metadata.hdfs.entity.InvalidatedBlock;
import io.hops.metadata.hdfs.entity.UnderReplicatedBlock;
import org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo;
import org.apache.hadoop.hdfs.server.blockmanagement.PendingBlockInfo;
import org.apache.hadoop.hdfs.server.blockmanagement.ReplicaUnderConstruction;
import org.apache.hadoop.hdfs.server.namenode.INodeFile;

import java.io.IOException;

final class BlockRelatedLock extends LockWithType {

    BlockRelatedLock(Type type) {
        super(type);
    }

    @Override
    protected void acquire(TransactionLocks locks) throws IOException {
        // FIXME handle null block
        Lock lock = locks.getLock(Type.Block);
        if (lock instanceof BaseIndividualBlockLock) {
            BaseIndividualBlockLock individualBlockLock = (BaseIndividualBlockLock) lock;
            //get by blocksId
            for (BlockInfo blk : individualBlockLock.getBlocks()) {
                if (isList()) {
                    acquireLockList(DEFAULT_LOCK_TYPE, getFinderType(true), blk.getBlockId(), blk.getInodeId());
                } else {
                    acquireLock(DEFAULT_LOCK_TYPE, getFinderType(true), blk.getBlockId(), blk.getInodeId());
                }
            }
            if (lock instanceof BlockLock) {
                //get by inodeId
                BlockLock blockLock = (BlockLock) lock;
                for (INodeFile file : blockLock.getFiles()) {
                    acquireLockList(DEFAULT_LOCK_TYPE, getFinderType(false), file.getId());
                }
            }
        } else {
            throw new TransactionLocks.LockNotAddedException("Block Lock wasn't added");
        }
    }

    private FinderType getFinderType(boolean byBlockID) {
        switch (getType()) {
        case Replica:
            return byBlockID ? IndexedReplica.Finder.ByBlockIdAndINodeId : IndexedReplica.Finder.ByINodeId;
        case CorruptReplica:
            return byBlockID ? CorruptReplica.Finder.ByBlockIdAndINodeId : CorruptReplica.Finder.ByINodeId;
        case ExcessReplica:
            return byBlockID ? ExcessReplica.Finder.ByBlockIdAndINodeId : ExcessReplica.Finder.ByINodeId;
        case ReplicaUnderConstruction:
            return byBlockID ? ReplicaUnderConstruction.Finder.ByBlockIdAndINodeId
                    : ReplicaUnderConstruction.Finder.ByINodeId;
        case InvalidatedBlock:
            return byBlockID ? InvalidatedBlock.Finder.ByBlockIdAndINodeId : InvalidatedBlock.Finder.ByINodeId;
        case UnderReplicatedBlock:
            return byBlockID ? UnderReplicatedBlock.Finder.ByBlockIdAndINodeId
                    : UnderReplicatedBlock.Finder.ByINodeId;
        case PendingBlock:
            return byBlockID ? PendingBlockInfo.Finder.ByBlockIdAndINodeId : PendingBlockInfo.Finder.ByINodeId;
        }
        return null;
    }

    private boolean isList() {
        switch (getType()) {
        case UnderReplicatedBlock:
        case PendingBlock:
            return false;
        default:
            return true;
        }
    }

}