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

Introduction

Here is the source code for io.hops.transaction.lock.LastTwoBlocksLock.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.common.INodeUtil;
import io.hops.metadata.hdfs.entity.LeasePath;
import org.apache.hadoop.hdfs.server.namenode.INode;

import java.io.IOException;
import java.util.Collection;

public final class LastTwoBlocksLock extends IndividualBlockLock {

    private final String path;
    private final Long fileId;

    public LastTwoBlocksLock(String src) {
        super();
        this.path = src;
        this.fileId = null;
    }

    public LastTwoBlocksLock(long fileId) {
        super();
        this.path = null;
        this.fileId = fileId;
    }

    @Override
    protected void acquire(TransactionLocks locks) throws IOException {
        INodeLock iNodeLock = (INodeLock) locks.getLock(Type.INode);
        LeasePathLock leasePathLock = (LeasePathLock) locks.getLock(Type.LeasePath);
        if (path != null) {
            Collection<LeasePath> lps = leasePathLock.getLeasePaths();
            for (LeasePath lp : lps) {
                if (lp.getPath().equals(path)) {
                    INode targetInode = iNodeLock.getTargetINode(path);
                    readBlock(lp.getLastBlockId(), targetInode.getId());
                    readBlock(lp.getPenultimateBlockId(), targetInode.getId());

                    if (getBlocks() == null || getBlocks().isEmpty()) {
                        announceEmptyFile(targetInode.getId());
                    }

                    break;
                }
            }
        } else {
            Collection<LeasePath> lps = leasePathLock.getLeasePaths();
            INode targetInode = INodeUtil.getNode(fileId, true);
            String p = targetInode.getFullPathName();
            for (LeasePath lp : lps) {
                if (lp.getPath().equals(p)) {
                    readBlock(lp.getLastBlockId(), fileId);
                    readBlock(lp.getPenultimateBlockId(), fileId);

                    if (getBlocks() == null || getBlocks().isEmpty()) {
                        announceEmptyFile(targetInode.getId());
                    }

                    break;
                }
            }
        }
    }

}