org.elasticsearch.index.translog.BufferedChecksumStreamOutput Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.index.translog;
import org.apache.lucene.store.BufferedChecksum;
import org.elasticsearch.common.io.stream.StreamOutput;
import java.io.IOException;
import java.util.zip.CRC32;
import java.util.zip.Checksum;
/**
* Similar to Lucene's BufferedChecksumIndexOutput, however this wraps a
* {@link StreamOutput} so anything written will update the checksum
*/
public final class BufferedChecksumStreamOutput extends StreamOutput {
private final StreamOutput out;
private final Checksum digest;
public BufferedChecksumStreamOutput(StreamOutput out) {
this.out = out;
this.digest = new BufferedChecksum(new CRC32());
}
public long getChecksum() {
return this.digest.getValue();
}
@Override
public void writeByte(byte b) throws IOException {
out.writeByte(b);
digest.update(b);
}
@Override
public void writeBytes(byte[] b, int offset, int length) throws IOException {
out.writeBytes(b, offset, length);
digest.update(b, offset, length);
}
@Override
public void flush() throws IOException {
out.flush();
}
@Override
public void close() throws IOException {
out.close();
}
@Override
public void reset() throws IOException {
out.reset();
digest.reset();
}
public void resetDigest() {
digest.reset();
}
}