/
InodeDirectoryIdGenerator.java
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/
InodeDirectoryIdGenerator.java
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/*
* Licensed to the University of California, Berkeley 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 under
* the License.
*/
package tachyon.master.file.meta;
import com.google.common.base.Preconditions;
import tachyon.master.block.BlockId;
import tachyon.master.block.ContainerIdGenerable;
import tachyon.master.journal.JournalEntryRepresentable;
import tachyon.proto.journal.File.InodeDirectoryIdGeneratorEntry;
import tachyon.proto.journal.Journal.JournalEntry;
/**
* Inode id management for directory inodes. Keep track of a block container id, along with a block
* sequence number. If the block sequence number reaches the limit, a new block container id is
* retrieved.
*/
public class InodeDirectoryIdGenerator implements JournalEntryRepresentable {
private final ContainerIdGenerable mContainerIdGenerator;
private boolean mInitialized = false;
private long mContainerId;
private long mSequenceNumber;
/**
* @param containerIdGenerator the container id generator to use
*/
public InodeDirectoryIdGenerator(ContainerIdGenerable containerIdGenerator) {
mContainerIdGenerator = Preconditions.checkNotNull(containerIdGenerator);
}
synchronized long getNewDirectoryId() {
initialize();
long directoryId = BlockId.createBlockId(mContainerId, mSequenceNumber);
if (mSequenceNumber == BlockId.getMaxSequenceNumber()) {
// No more ids in this container. Get a new container for the next id.
mContainerId = mContainerIdGenerator.getNewContainerId();
mSequenceNumber = 0;
} else {
mSequenceNumber ++;
}
return directoryId;
}
@Override
public synchronized JournalEntry toJournalEntry() {
InodeDirectoryIdGeneratorEntry inodeDirectoryIdGenerator =
InodeDirectoryIdGeneratorEntry.newBuilder()
.setContainerId(mContainerId)
.setSequenceNumber(mSequenceNumber)
.build();
return JournalEntry.newBuilder()
.setInodeDirectoryIdGenerator(inodeDirectoryIdGenerator)
.build();
}
public void initFromJournalEntry(InodeDirectoryIdGeneratorEntry entry) {
mContainerId = entry.getContainerId();
mSequenceNumber = entry.getSequenceNumber();
mInitialized = true;
}
private void initialize() {
if (!mInitialized) {
mContainerId = mContainerIdGenerator.getNewContainerId();
mSequenceNumber = 0;
mInitialized = true;
}
}
}