hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/metrics2/impl/TestGraphiteMetrics.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.metrics2.impl;

import static org.junit.Assert.assertEquals;

import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import static org.mockito.Mockito.*;

import org.apache.hadoop.metrics2.AbstractMetric;
import org.apache.hadoop.metrics2.MetricsException;
import org.apache.hadoop.metrics2.MetricsRecord;
import org.apache.hadoop.metrics2.MetricsTag;
import org.apache.hadoop.metrics2.sink.GraphiteSink;
import org.junit.Test;
import org.mockito.ArgumentCaptor;

public class TestGraphiteMetrics {
    private AbstractMetric makeMetric(String name, Number value) {
        AbstractMetric metric = mock(AbstractMetric.class);
        when(metric.name()).thenReturn(name);
        when(metric.value()).thenReturn(value);
        return metric;
    }

    @Test
    public void testPutMetrics() {
        GraphiteSink sink = new GraphiteSink();
        List<MetricsTag> tags = new ArrayList<MetricsTag>();
        tags.add(new MetricsTag(MsInfo.Context, "all"));
        tags.add(new MetricsTag(MsInfo.Hostname, "host"));
        Set<AbstractMetric> metrics = new HashSet<AbstractMetric>();
        metrics.add(makeMetric("foo1", 1.25));
        metrics.add(makeMetric("foo2", 2.25));
        MetricsRecord record = new MetricsRecordImpl(MsInfo.Context, (long) 10000, tags, metrics);

        OutputStreamWriter writer = mock(OutputStreamWriter.class);
        ArgumentCaptor<String> argument = ArgumentCaptor.forClass(String.class);

        sink.setWriter(writer);
        sink.putMetrics(record);

        try {
            verify(writer).write(argument.capture());
        } catch (IOException e) {
            e.printStackTrace();
        }

        String result = argument.getValue().toString();

        assertEquals(true,
            result.equals("null.all.Context.Context=all.Hostname=host.foo1 1.25 10\n" +
            "null.all.Context.Context=all.Hostname=host.foo2 2.25 10\n") ||
            result.equals("null.all.Context.Context=all.Hostname=host.foo2 2.25 10\n" + 
            "null.all.Context.Context=all.Hostname=host.foo1 1.25 10\n"));
    }

    @Test
    public void testPutMetrics2() {
        GraphiteSink sink = new GraphiteSink();
        List<MetricsTag> tags = new ArrayList<MetricsTag>();
        tags.add(new MetricsTag(MsInfo.Context, "all"));
        tags.add(new MetricsTag(MsInfo.Hostname, null));
        Set<AbstractMetric> metrics = new HashSet<AbstractMetric>();
        metrics.add(makeMetric("foo1", 1));
        metrics.add(makeMetric("foo2", 2));
        MetricsRecord record = new MetricsRecordImpl(MsInfo.Context, (long) 10000, tags, metrics);

        OutputStreamWriter writer = mock(OutputStreamWriter.class);
        ArgumentCaptor<String> argument = ArgumentCaptor.forClass(String.class);

        sink.setWriter(writer);
        sink.putMetrics(record);

        try {
            verify(writer).write(argument.capture());
        } catch (IOException e) {
            e.printStackTrace();
        }

        String result = argument.getValue().toString();

        assertEquals(true,
            result.equals("null.all.Context.Context=all.foo1 1 10\n" + 
            "null.all.Context.Context=all.foo2 2 10\n") ||
            result.equals("null.all.Context.Context=all.foo2 2 10\n" + 
            "null.all.Context.Context=all.foo1 1 10\n"));
    }
    @Test(expected=MetricsException.class)
    public void testCloseAndWrite() throws IOException {
      GraphiteSink sink = new GraphiteSink();
      List<MetricsTag> tags = new ArrayList<MetricsTag>();
      tags.add(new MetricsTag(MsInfo.Context, "all"));
      tags.add(new MetricsTag(MsInfo.Hostname, "host"));
      Set<AbstractMetric> metrics = new HashSet<AbstractMetric>();
      metrics.add(makeMetric("foo1", 1.25));
      metrics.add(makeMetric("foo2", 2.25));
      MetricsRecord record = new MetricsRecordImpl(MsInfo.Context, (long) 10000, tags, metrics);

      OutputStreamWriter writer = mock(OutputStreamWriter.class);

      sink.setWriter(writer);
      sink.close();
      sink.putMetrics(record);
    }

    @Test
    public void testClose(){
      GraphiteSink sink = new GraphiteSink();
      Writer mockWriter = mock(Writer.class);
      sink.setWriter(mockWriter);
      try {
        sink.close();
      } catch (IOException ioe) {
        ioe.printStackTrace();
      }

      try {
        verify(mockWriter).close();
      } catch (IOException ioe) {
        ioe.printStackTrace();
      }
    }
}