exec/java-exec/src/main/java/org/apache/drill/exec/cache/LoopedAbstractDrillSerializable.java


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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.drill.exec.cache;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.OutputStream;

import org.apache.drill.common.util.DataInputInputStream;
import org.apache.drill.common.util.DataOutputOutputStream;

/**
 * Helper class that holds the basic functionality to interchangeably use
 * the different Drill serializble interfaces. This is package private as
 * users should utilize either AbstractDataSerializable or AbstractStreamSerializable
 * instead to avoid infinite loops.
 */
abstract class LoopedAbstractDrillSerializable implements DrillSerializable {
//  private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(LoopedAbstractDrillSerializable.class);

  @Override
  public void writeExternal(ObjectOutput out) throws IOException {
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    writeToStream(baos);
    final byte[] ba = baos.toByteArray();
    out.writeInt(ba.length);
    out.write(ba);
  }

  @Override
  public void read(DataInput input) throws IOException {
    readFromStream(DataInputInputStream.constructInputStream(input));
  }

  @Override
  public void write(DataOutput output) throws IOException {
    writeToStream(DataOutputOutputStream.constructOutputStream(output));
  }

  @Override
  public void readFromStream(InputStream input) throws IOException {
    read(new DataInputStream(input));
  }

  @Override
  public void writeToStream(OutputStream output) throws IOException {
    write(new DataOutputStream(output));
  }

  @Override
  public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
    final int len = in.readInt();
    final byte[] bytes = new byte[len];
    in.readFully(bytes);
    readFromStream(new ByteArrayInputStream(bytes));
  }
}