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Phoenix Client
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/*
 * Licensed to the Apache Software Foundation (ASF) 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 org.apache.tephra.persist;

import com.google.common.util.concurrent.AbstractIdleService;
import com.google.inject.Inject;
import org.apache.tephra.snapshot.SnapshotCodec;
import org.apache.tephra.snapshot.SnapshotCodecProvider;

import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * Minimal {@link TransactionStateStorage} implementation that does nothing, i.e. does not maintain any actual state.
 */
public class NoOpTransactionStateStorage extends AbstractIdleService implements TransactionStateStorage {

  private final SnapshotCodec codec;

  @Inject
  public NoOpTransactionStateStorage(SnapshotCodecProvider codecProvider) {
    codec = codecProvider;
  }

  @Override
  protected void startUp() throws Exception {
  }

  @Override
  protected void shutDown() throws Exception {
  }

  @Override
  public void writeSnapshot(OutputStream out, TransactionSnapshot snapshot) throws IOException {
    codec.encode(out, snapshot);
  }

  @Override
  public void writeSnapshot(TransactionSnapshot snapshot) throws IOException {
  }

  @Override
  public TransactionSnapshot getLatestSnapshot() throws IOException {
    return null;
  }

  @Override
  public TransactionVisibilityState getLatestTransactionVisibilityState() throws IOException {
    return null;
  }

  @Override
  public long deleteOldSnapshots(int numberToKeep) throws IOException {
    return 0;
  }

  @Override
  public List listSnapshots() throws IOException {
    return new ArrayList<>(0);
  }

  @Override
  public List getLogsSince(long timestamp) throws IOException {
    return new ArrayList<>(0);
  }

  @Override
  public TransactionLog createLog(long timestamp) throws IOException {
    return new NoOpTransactionLog();
  }

  @Override
  public void deleteLogsOlderThan(long timestamp) throws IOException {
  }

  @Override
  public void setupStorage() throws IOException {
  }

  @Override
  public List listLogs() throws IOException {
    return new ArrayList<>(0);
  }

  @Override
  public String getLocation() {
    return "no-op";
  }

  private static class NoOpTransactionLog implements TransactionLog {
    private long timestamp = System.currentTimeMillis();

    @Override
    public String getName() {
      return "no-op";
    }

    @Override
    public long getTimestamp() {
      return timestamp;
    }

    @Override
    public void append(TransactionEdit edit) throws IOException {
    }

    @Override
    public void append(List edits) throws IOException {
    }

    @Override
    public void close() {
    }

    @Override
    public TransactionLogReader getReader() {
      return new TransactionLogReader() {
        @Override
        public TransactionEdit next() {
          return null;
        }

        @Override
        public TransactionEdit next(TransactionEdit reuse) {
          return null;
        }

        @Override
        public void close() {
        }
      };
    }
  }
}