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.jupiter.api.Assertions.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.testclassification.MiscTests;
037import org.apache.hadoop.hbase.testclassification.SmallTests;
038import org.junit.jupiter.api.Tag;
039import org.junit.jupiter.api.Test;
040
041import org.apache.hbase.thirdparty.com.google.common.reflect.TypeToken;
042import org.apache.hbase.thirdparty.com.google.gson.Gson;
043
044/**
045 * Test {@link JSONBean}.
046 */
047@Tag(MiscTests.TAG)
048@Tag(SmallTests.TAG)
049public class TestJSONBean {
050
051  private MBeanServer getMockMBeanServer() throws Exception {
052    MBeanServer mbeanServer = mock(MBeanServer.class);
053    Set<ObjectName> names = new HashSet<>();
054    names.add(new ObjectName("test1:type=test2"));
055    when(mbeanServer.queryNames(any(), any())).thenReturn(names);
056    MBeanInfo mbeanInfo = mock(MBeanInfo.class);
057    when(mbeanInfo.getClassName()).thenReturn("testClassName");
058    String[] attributeNames =
059      new String[] { "intAttr", "nanAttr", "infinityAttr", "strAttr", "boolAttr", "test:Attr" };
060    MBeanAttributeInfo[] attributeInfos = new MBeanAttributeInfo[attributeNames.length];
061    for (int i = 0; i < attributeInfos.length; i++) {
062      attributeInfos[i] = new MBeanAttributeInfo(attributeNames[i], null, null, true, false, false);
063    }
064    when(mbeanInfo.getAttributes()).thenReturn(attributeInfos);
065    when(mbeanServer.getMBeanInfo(any())).thenReturn(mbeanInfo);
066    when(mbeanServer.getAttribute(any(), eq("intAttr"))).thenReturn(3);
067    when(mbeanServer.getAttribute(any(), eq("nanAttr"))).thenReturn(Double.NaN);
068    when(mbeanServer.getAttribute(any(), eq("infinityAttr"))).thenReturn(Double.POSITIVE_INFINITY);
069    when(mbeanServer.getAttribute(any(), eq("strAttr"))).thenReturn("aString");
070    when(mbeanServer.getAttribute(any(), eq("boolAttr"))).thenReturn(true);
071    when(mbeanServer.getAttribute(any(), eq("test:Attr"))).thenReturn("aString");
072    return mbeanServer;
073  }
074
075  private String getExpectedJSON() {
076    StringWriter sw = new StringWriter();
077    PrintWriter pw = new PrintWriter(sw);
078    pw.println("{");
079    pw.println("  \"beans\": [");
080    pw.println("    {");
081    pw.println("      \"name\": \"test1:type=test2\",");
082    pw.println("      \"modelerType\": \"testClassName\",");
083    pw.println("      \"intAttr\": 3,");
084    pw.println("      \"nanAttr\": \"NaN\",");
085    pw.println("      \"infinityAttr\": \"Infinity\",");
086    pw.println("      \"strAttr\": \"aString\",");
087    pw.println("      \"boolAttr\": true,");
088    pw.println("      \"test:Attr\": aString");
089    pw.println("    }");
090    pw.println("  ]");
091    pw.print("}");
092    return sw.toString();
093  }
094
095  @Test
096  public void testJSONBeanValueTypes() throws Exception {
097    JSONBean bean = new JSONBean();
098    StringWriter stringWriter = new StringWriter();
099    try (PrintWriter printWriter = new PrintWriter(stringWriter);
100      JSONBean.Writer jsonWriter = bean.open(printWriter)) {
101      jsonWriter.write(getMockMBeanServer(), null, null, false);
102    }
103
104    final Gson gson = GsonUtil.createGson().create();
105    Type typeOfHashMap = new TypeToken<Map<String, Object>>() {
106    }.getType();
107    Map<String, Object> expectedJson = gson.fromJson(getExpectedJSON(), typeOfHashMap);
108    Map<String, Object> actualJson = gson.fromJson(stringWriter.toString(), typeOfHashMap);
109    assertEquals(expectedJson, actualJson);
110  }
111}