/*
 * 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.flink.streaming.runtime.io;

import org.apache.flink.core.memory.DataInputView;
import org.apache.flink.core.memory.DataOutputView;
import org.apache.flink.runtime.event.AbstractEvent;
import org.apache.flink.util.StringUtils;

import java.io.IOException;
import java.util.Arrays;

/**
 * A simple task event, used for validation of buffer or event blocking/buffering.
 */
public class TestEvent extends AbstractEvent {

	private long magicNumber;

	private byte[] payload;

	public TestEvent() {}

	public TestEvent(long magicNumber, byte[] payload) {
		this.magicNumber = magicNumber;
		this.payload = payload;
	}


	// ------------------------------------------------------------------------
	//  Serialization
	// ------------------------------------------------------------------------

	@Override
	public void write(DataOutputView out) throws IOException {
		out.writeLong(magicNumber);
		out.writeInt(payload.length);
		out.write(payload);
	}

	@Override
	public void read(DataInputView in) throws IOException {
		this.magicNumber = in.readLong();
		this.payload = new byte[in.readInt()];
		in.readFully(this.payload);
	}

	// ------------------------------------------------------------------------
	//  Standard utilities
	// ------------------------------------------------------------------------

	@Override
	public int hashCode() {
		return Long.valueOf(magicNumber).hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if (obj != null && obj.getClass() == TestEvent.class) {
			TestEvent that = (TestEvent) obj;
			return this.magicNumber == that.magicNumber && Arrays.equals(this.payload, that.payload);
		}
		else {
			return false;
		}
	}

	@Override
	public String toString() {
		return String.format("TestEvent %d (%s)", magicNumber, StringUtils.byteToHexString(payload));
	}
}