How to use

writeTo

method

in

org.elasticsearch.common.io.stream.Streamable

/**
 * Writes a list of {@link Streamable} objects
 */
public void writeStreamableList(List<? extends Streamable> list) throws IOException {
  writeVInt(list.size());
  for (Streamable obj: list) {
    obj.writeTo(this);
  }
}

/**
 * Serializes a potential null value.
 */
public void writeOptionalStreamable(@Nullable Streamable streamable) throws IOException {
  if (streamable != null) {
    writeBoolean(true);
    streamable.writeTo(this);
  } else {
    writeBoolean(false);
  }
}

/**
 * Writes a list of {@link Streamable} objects
 */
public void writeStreamableList(List<? extends Streamable> list) throws IOException {
  writeVInt(list.size());
  for (Streamable obj: list) {
    obj.writeTo(this);
  }
}

/**
 * Writes a list of {@link Streamable} objects
 */
public void writeStreamableList(List<? extends Streamable> list) throws IOException {
  writeVInt(list.size());
  for (Streamable obj: list) {
    obj.writeTo(this);
  }
}

/**
 * Writes a list of {@link Writeable} objects
 */
public void writeList(List<? extends Writeable> list) throws IOException {
  writeVInt(list.size());
  for (Writeable obj: list) {
    obj.writeTo(this);
  }
}

/**
 * Serializes a potential null value.
 */
public void writeOptionalStreamable(@Nullable Streamable streamable) throws IOException {
  if (streamable != null) {
    writeBoolean(true);
    streamable.writeTo(this);
  } else {
    writeBoolean(false);
  }
}

/**
 * Serializes a potential null value.
 */
public void writeOptionalStreamable(@Nullable Streamable streamable) throws IOException {
  if (streamable != null) {
    writeBoolean(true);
    streamable.writeTo(this);
  } else {
    writeBoolean(false);
  }
}

public void writeOptionalWriteable(@Nullable Writeable writeable) throws IOException {
  if (writeable != null) {
    writeBoolean(true);
    writeable.writeTo(this);
  } else {
    writeBoolean(false);
  }
}

/**
 * Serializes a potential null value.
 */
public void writeOptionalStreamable(@Nullable Streamable streamable) throws IOException {
  if (streamable != null) {
    writeBoolean(true);
    streamable.writeTo(this);
  } else {
    writeBoolean(false);
  }
}

private static BytesReference serialize(Version version, Streamable streamable) throws IOException {
  BytesStreamOutput output = new BytesStreamOutput();
  output.setVersion(version);
  streamable.writeTo(output);
  output.flush();
  return output.bytes();
}

/**
 * Round trip {@code instance} through binary serialization, setting the wire compatibility version to {@code version}.
 */
private T copyInstance(T instance, Version version) throws IOException {
  try (BytesStreamOutput output = new BytesStreamOutput()) {
    output.setVersion(version);
    instance.writeTo(output);
    try (StreamInput in = new NamedWriteableAwareStreamInput(output.bytes().streamInput(),
        getNamedWriteableRegistry())) {
      in.setVersion(version);
      T newInstance = createBlankInstance();
      newInstance.readFrom(in);
      return newInstance;
    }
  }
}