/*
 * 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
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 */
package org.apache.flink.runtime.metrics.groups;

import org.apache.flink.metrics.Counter;
import org.apache.flink.metrics.SimpleCounter;
import org.apache.flink.runtime.executiongraph.IOMetrics;
import org.apache.flink.runtime.operators.testutils.UnregisteredTaskMetricsGroup;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

public class TaskIOMetricGroupTest {
	@Test
	public void testTaskIOMetricGroup() {
		TaskMetricGroup task = new UnregisteredTaskMetricsGroup();
		TaskIOMetricGroup taskIO = task.getIOMetricGroup();

		// test counter forwarding
		assertNotNull(taskIO.getNumRecordsInCounter());
		assertNotNull(taskIO.getNumRecordsOutCounter());

		Counter c1 = new SimpleCounter();
		c1.inc(32L);
		Counter c2 = new SimpleCounter();
		c2.inc(64L);

		taskIO.reuseRecordsInputCounter(c1);
		taskIO.reuseRecordsOutputCounter(c2);
		assertEquals(32L, taskIO.getNumRecordsInCounter().getCount());
		assertEquals(64L, taskIO.getNumRecordsOutCounter().getCount());

		// test IOMetrics instantiation
		taskIO.getNumBytesInLocalCounter().inc(100L);
		taskIO.getNumBytesInRemoteCounter().inc(150L);
		taskIO.getNumBytesOutCounter().inc(250L);
		
		IOMetrics io = taskIO.createSnapshot();
		assertEquals(32L, io.getNumRecordsIn());
		assertEquals(64L, io.getNumRecordsOut());
		assertEquals(100L, io.getNumBytesInLocal());
		assertEquals(150L, io.getNumBytesInRemote());
		assertEquals(250L, io.getNumBytesOut());
	}
}