001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.util;
020
021import static org.junit.Assert.assertEquals;
022import static org.mockito.ArgumentMatchers.eq;
023import static org.mockito.Mockito.any;
024import static org.mockito.Mockito.mock;
025import static org.mockito.Mockito.when;
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;
042import org.apache.hbase.thirdparty.com.google.common.reflect.TypeToken;
043import org.apache.hbase.thirdparty.com.google.gson.Gson;
044
045/**
046 * Test {@link JSONBean}.
047 */
048@Category({MiscTests.class, SmallTests.class})
049public class TestJSONBean {
050  @ClassRule
051  public static final HBaseClassTestRule CLASS_RULE =
052    HBaseClassTestRule.forClass(TestJSONBean.class);
053
054  private MBeanServer getMockMBeanServer() throws Exception {
055    MBeanServer mbeanServer = mock(MBeanServer.class);
056    Set<ObjectName> names = new HashSet<>();
057    names.add(new ObjectName("test1:type=test2"));
058    when(mbeanServer.queryNames(any(), any())).thenReturn(names);
059    MBeanInfo mbeanInfo = mock(MBeanInfo.class);
060    when(mbeanInfo.getClassName()).thenReturn("testClassName");
061    String[] attributeNames = new String[] {"intAttr", "nanAttr", "infinityAttr",
062      "strAttr", "boolAttr"};
063    MBeanAttributeInfo[] attributeInfos = new MBeanAttributeInfo[attributeNames.length];
064    for (int i = 0; i < attributeInfos.length; i++) {
065      attributeInfos[i] = new MBeanAttributeInfo(attributeNames[i],
066        null,
067        null,
068        true,
069        false,
070        false);
071    }
072    when(mbeanInfo.getAttributes()).thenReturn(attributeInfos);
073    when(mbeanServer.getMBeanInfo(any())).thenReturn(mbeanInfo);
074    when(mbeanServer.getAttribute(any(), eq("intAttr"))).thenReturn(3);
075    when(mbeanServer.getAttribute(any(), eq("nanAttr"))).thenReturn(Double.NaN);
076    when(mbeanServer.getAttribute(any(), eq("infinityAttr"))).
077      thenReturn(Double.POSITIVE_INFINITY);
078    when(mbeanServer.getAttribute(any(), eq("strAttr"))).thenReturn("aString");
079    when(mbeanServer.getAttribute(any(), eq("boolAttr"))).thenReturn(true);
080    return mbeanServer;
081  }
082
083  private String getExpectedJSON() {
084    StringWriter sw = new StringWriter();
085    PrintWriter pw = new PrintWriter(sw);
086    pw.println("{");
087    pw.println("  \"beans\": [");
088    pw.println("    {");
089    pw.println("      \"name\": \"test1:type=test2\",");
090    pw.println("      \"modelerType\": \"testClassName\",");
091    pw.println("      \"intAttr\": 3,");
092    pw.println("      \"nanAttr\": \"NaN\",");
093    pw.println("      \"infinityAttr\": \"Infinity\",");
094    pw.println("      \"strAttr\": \"aString\",");
095    pw.println("      \"boolAttr\": true");
096    pw.println("    }");
097    pw.println("  ]");
098    pw.print("}");
099    return sw.toString();
100  }
101
102  @Test
103  public void testJSONBeanValueTypes() throws Exception {
104    JSONBean bean = new JSONBean();
105    StringWriter stringWriter = new StringWriter();
106    try (
107      PrintWriter printWriter = new PrintWriter(stringWriter);
108      JSONBean.Writer jsonWriter = bean.open(printWriter)) {
109      jsonWriter.write(getMockMBeanServer(), null, null, false);
110    }
111
112    final Gson gson = GsonUtil.createGson().create();
113    Type typeOfHashMap = new TypeToken<Map<String, Object>>() {}.getType();
114    Map<String, Object> expectedJson = gson.fromJson(getExpectedJSON(), typeOfHashMap);
115    Map<String, Object> actualJson = gson.fromJson(stringWriter.toString(), typeOfHashMap);
116    assertEquals(expectedJson, actualJson);
117  }
118}