hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestRetryCacheMetrics.java

/**
 * 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.hadoop.ipc;

import org.apache.hadoop.ipc.metrics.RetryCacheMetrics;
import org.apache.hadoop.metrics2.MetricsRecordBuilder;
import org.junit.Test;

import static org.apache.hadoop.test.MetricsAsserts.assertCounter;
import static org.apache.hadoop.test.MetricsAsserts.getMetrics;
import static org.mockito.Mockito.*;

/**
 * Tests for {@link RetryCacheMetrics}
 */
public class TestRetryCacheMetrics {
  static final String cacheName = "NameNodeRetryCache";

  @Test
  public void testNames() {
    RetryCache cache = mock(RetryCache.class);
    when(cache.getCacheName()).thenReturn(cacheName);

    RetryCacheMetrics metrics = RetryCacheMetrics.create(cache);

    metrics.incrCacheHit();

    metrics.incrCacheCleared();
    metrics.incrCacheCleared();

    metrics.incrCacheUpdated();
    metrics.incrCacheUpdated();
    metrics.incrCacheUpdated();

    checkMetrics(1, 2, 3);
  }

  private void checkMetrics(long hit, long cleared, long updated) {
    MetricsRecordBuilder rb = getMetrics("RetryCache." + cacheName);
    assertCounter("CacheHit", hit, rb);
    assertCounter("CacheCleared", cleared, rb);
    assertCounter("CacheUpdated", updated, rb);
  }
}