co.cask.tigon.data.transaction.snapshot.SnapshotCodecV2.java Source code

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Here is the source code for co.cask.tigon.data.transaction.snapshot.SnapshotCodecV2.java

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/*
 * 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.tigon.data.transaction.snapshot;

import co.cask.tephra.TransactionManager;
import co.cask.tephra.persist.TransactionSnapshot;
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 TransactionSnapshot}
 * and its elements to {@code byte[]}.
 */
public class SnapshotCodecV2 extends AbstractSnapshotCodec {
    public static final int VERSION = 2;

    @Override
    public int getVersion() {
        return VERSION;
    }

    @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.writeLong(entry.getValue().getVisibilityUpperBound());
            }
        }
        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) {
                long txId = decoder.readLong();
                long expiration = decoder.readLong();
                long visibilityUpperBound = decoder.readLong();
                inProgress.put(txId, new TransactionManager.InProgressTx(visibilityUpperBound, expiration));
            }
            size = decoder.readInt();
        }
        return inProgress;
    }
}