org.elasticsearch.index.translog.LegacyTranslogReader Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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 org.elasticsearch.index.translog;
import org.elasticsearch.common.io.stream.StreamInput;
import java.io.IOException;
/**
* Version 0 of the translog format, there is no header in this file
*/
@Deprecated
public final class LegacyTranslogReader extends LegacyTranslogReaderBase {
/**
* Create a snapshot of translog file channel. The length parameter should be consistent with totalOperations and point
* at the end of the last operation in this snapshot.
*/
LegacyTranslogReader(long generation, ChannelReference channelReference, long fileLength) {
super(generation, channelReference, 0, fileLength);
}
@Override
protected Translog.Operation read(BufferedChecksumStreamInput in) throws IOException {
// read the opsize before an operation.
// Note that this was written & read out side of the stream when this class was used, but it makes things more consistent
// to read this here
in.readInt();
Translog.Operation.Type type = Translog.Operation.Type.fromId(in.readByte());
Translog.Operation operation = Translog.newOperationFromType(type);
operation.readFrom(in);
return operation;
}
@Override
protected ImmutableTranslogReader newReader(long generation, ChannelReference channelReference, long firstOperationOffset, long length, int totalOperations) {
assert totalOperations == -1 : "expected unknown but was: " + totalOperations;
assert firstOperationOffset == 0;
return new LegacyTranslogReader(generation, channelReference, length);
}
}