/*
 * 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.webmonitor.handlers.checkpoints;

import org.apache.flink.runtime.checkpoint.AbstractCheckpointStats;
import org.apache.flink.runtime.checkpoint.CheckpointStatsStatus;
import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

public class CheckpointStatsCacheTest {

	@Test
	public void testZeroSizeCache() throws Exception {
		AbstractCheckpointStats checkpoint = createCheckpoint(0, CheckpointStatsStatus.COMPLETED);

		CheckpointStatsCache cache = new CheckpointStatsCache(0);
		cache.tryAdd(checkpoint);
		assertNull(cache.tryGet(0L));
	}

	@Test
	public void testCacheAddAndGet() throws Exception {
		AbstractCheckpointStats chk0 = createCheckpoint(0, CheckpointStatsStatus.COMPLETED);
		AbstractCheckpointStats chk1 = createCheckpoint(1, CheckpointStatsStatus.COMPLETED);
		AbstractCheckpointStats chk2 = createCheckpoint(2, CheckpointStatsStatus.IN_PROGRESS);

		CheckpointStatsCache cache = new CheckpointStatsCache(1);
		cache.tryAdd(chk0);
		assertEquals(chk0, cache.tryGet(0));

		cache.tryAdd(chk1);
		assertNull(cache.tryGet(0));
		assertEquals(chk1, cache.tryGet(1));

		cache.tryAdd(chk2);
		assertNull(cache.tryGet(2));
		assertNull(cache.tryGet(0));
		assertEquals(chk1, cache.tryGet(1));
	}

	private AbstractCheckpointStats createCheckpoint(long id, CheckpointStatsStatus status) {
		AbstractCheckpointStats checkpoint = mock(AbstractCheckpointStats.class);
		when(checkpoint.getCheckpointId()).thenReturn(id);
		when(checkpoint.getStatus()).thenReturn(status);
		return checkpoint;
	}
}