001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.util;
019
020import static org.junit.Assert.assertEquals;
021import static org.mockito.ArgumentMatchers.eq;
022import static org.mockito.Mockito.any;
023import static org.mockito.Mockito.mock;
024import static org.mockito.Mockito.when;
025
026import java.io.PrintWriter;
027import java.io.StringWriter;
028import java.lang.reflect.Type;
029import java.util.HashSet;
030import java.util.Map;
031import java.util.Set;
032import javax.management.MBeanAttributeInfo;
033import javax.management.MBeanInfo;
034import javax.management.MBeanServer;
035import javax.management.ObjectName;
036import org.apache.hadoop.hbase.HBaseClassTestRule;
037import org.apache.hadoop.hbase.testclassification.MiscTests;
038import org.apache.hadoop.hbase.testclassification.SmallTests;
039import org.junit.ClassRule;
040import org.junit.Test;
041import org.junit.experimental.categories.Category;
042
043import org.apache.hbase.thirdparty.com.google.common.reflect.TypeToken;
044import org.apache.hbase.thirdparty.com.google.gson.Gson;
045
046/**
047 * Test {@link JSONBean}.
048 */
049@Category({ MiscTests.class, SmallTests.class })
050public class TestJSONBean {
051  @ClassRule
052  public static final HBaseClassTestRule CLASS_RULE =
053    HBaseClassTestRule.forClass(TestJSONBean.class);
054
055  private MBeanServer getMockMBeanServer() throws Exception {
056    MBeanServer mbeanServer = mock(MBeanServer.class);
057    Set<ObjectName> names = new HashSet<>();
058    names.add(new ObjectName("test1:type=test2"));
059    when(mbeanServer.queryNames(any(), any())).thenReturn(names);
060    MBeanInfo mbeanInfo = mock(MBeanInfo.class);
061    when(mbeanInfo.getClassName()).thenReturn("testClassName");
062    String[] attributeNames =
063      new String[] { "intAttr", "nanAttr", "infinityAttr", "strAttr", "boolAttr", "test:Attr" };
064    MBeanAttributeInfo[] attributeInfos = new MBeanAttributeInfo[attributeNames.length];
065    for (int i = 0; i < attributeInfos.length; i++) {
066      attributeInfos[i] = new MBeanAttributeInfo(attributeNames[i], null, null, true, false, false);
067    }
068    when(mbeanInfo.getAttributes()).thenReturn(attributeInfos);
069    when(mbeanServer.getMBeanInfo(any())).thenReturn(mbeanInfo);
070    when(mbeanServer.getAttribute(any(), eq("intAttr"))).thenReturn(3);
071    when(mbeanServer.getAttribute(any(), eq("nanAttr"))).thenReturn(Double.NaN);
072    when(mbeanServer.getAttribute(any(), eq("infinityAttr"))).thenReturn(Double.POSITIVE_INFINITY);
073    when(mbeanServer.getAttribute(any(), eq("strAttr"))).thenReturn("aString");
074    when(mbeanServer.getAttribute(any(), eq("boolAttr"))).thenReturn(true);
075    when(mbeanServer.getAttribute(any(), eq("test:Attr"))).thenReturn("aString");
076    return mbeanServer;
077  }
078
079  private String getExpectedJSON() {
080    StringWriter sw = new StringWriter();
081    PrintWriter pw = new PrintWriter(sw);
082    pw.println("{");
083    pw.println("  \"beans\": [");
084    pw.println("    {");
085    pw.println("      \"name\": \"test1:type=test2\",");
086    pw.println("      \"modelerType\": \"testClassName\",");
087    pw.println("      \"intAttr\": 3,");
088    pw.println("      \"nanAttr\": \"NaN\",");
089    pw.println("      \"infinityAttr\": \"Infinity\",");
090    pw.println("      \"strAttr\": \"aString\",");
091    pw.println("      \"boolAttr\": true,");
092    pw.println("      \"test:Attr\": aString");
093    pw.println("    }");
094    pw.println("  ]");
095    pw.print("}");
096    return sw.toString();
097  }
098
099  @Test
100  public void testJSONBeanValueTypes() throws Exception {
101    JSONBean bean = new JSONBean();
102    StringWriter stringWriter = new StringWriter();
103    try (PrintWriter printWriter = new PrintWriter(stringWriter);
104      JSONBean.Writer jsonWriter = bean.open(printWriter)) {
105      jsonWriter.write(getMockMBeanServer(), null, null, false);
106    }
107
108    final Gson gson = GsonUtil.createGson().create();
109    Type typeOfHashMap = new TypeToken<Map<String, Object>>() {
110    }.getType();
111    Map<String, Object> expectedJson = gson.fromJson(getExpectedJSON(), typeOfHashMap);
112    Map<String, Object> actualJson = gson.fromJson(stringWriter.toString(), typeOfHashMap);
113    assertEquals(expectedJson, actualJson);
114  }
115}