/*
* Copyright © 2014 Cask Data, Inc.
*
* 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 co.cask.cdap.data2.transaction.snapshot;
import co.cask.tephra.TransactionManager;
import co.cask.tephra.snapshot.BinaryDecoder;
import co.cask.tephra.snapshot.BinaryEncoder;
import com.google.common.collect.Maps;
import java.io.IOException;
import java.util.Map;
import java.util.NavigableMap;
/**
* Handles serialization/deserialization of a {@link co.cask.tephra.persist.TransactionSnapshot} and
* its elements to {@code byte[]}.
* @deprecated Replaced by use of {@code co.cask.tephra.snapshot.SnapshotCodecV3}.
*/
@Deprecated
public class SnapshotCodecV1 extends AbstractSnapshotCodec {
public static final int VERSION = 1;
@Override
public int getVersion() {
return VERSION;
}
@Override
protected void decodeObsoleteAttributes(BinaryDecoder decoder) throws IOException {
// watermark attribute was removed
decoder.readLong();
}
@Override
protected void encodeObsoleteAttributes(BinaryEncoder encoder) throws IOException {
// writing watermark attribute (that was removed in newer codecs), 55L - any random value, will not be used anywhere
encoder.writeLong(55L);
}
@Override
protected void encodeInProgress(BinaryEncoder encoder, Map<Long, TransactionManager.InProgressTx> inProgress)
throws IOException {
if (!inProgress.isEmpty()) {
encoder.writeInt(inProgress.size());
for (Map.Entry<Long, TransactionManager.InProgressTx> entry : inProgress.entrySet()) {
encoder.writeLong(entry.getKey()); // tx id
encoder.writeLong(entry.getValue().getExpiration());
}
}
encoder.writeInt(0); // zero denotes end of list as per AVRO spec
}
@Override
protected NavigableMap<Long, TransactionManager.InProgressTx> decodeInProgress(BinaryDecoder decoder)
throws IOException {
int size = decoder.readInt();
NavigableMap<Long, TransactionManager.InProgressTx> inProgress = Maps.newTreeMap();
while (size != 0) { // zero denotes end of list as per AVRO spec
for (int remaining = size; remaining > 0; --remaining) {
inProgress.put(decoder.readLong(),
// 1st version did not store visibilityUpperBound. It is safe to set firstInProgress to 0,
// it may decrease performance until this tx is finished, but correctness will be preserved.
new TransactionManager.InProgressTx(0L, decoder.readLong()));
}
size = decoder.readInt();
}
return inProgress;
}
}