package com.atlassian.plugin.jmx;
   
   import org.hamcrest.Matchers;
   import org.junit.Before;
   import org.junit.Rule;
   import org.junit.Test;
   import org.junit.rules.ExpectedException;
   
   import javax.management.InstanceNotFoundException;
  import javax.management.MBeanServer;
  import javax.management.ObjectName;
  import javax.management.RuntimeMBeanException;
  import java.lang.management.ManagementFactory;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.containsString;
  import static org.hamcrest.Matchers.instanceOf;
  import static org.hamcrest.Matchers.is;
  
  public class TestAbstractJmxBridge {
  
      private static final boolean NONDEFAULT_BOOLEAN = true;
      private static final char NONDEFAULT_CHAR = 'A';
      private static final byte NONDEFAULT_BYTE = 1;
      private static final short NONDEFAULT_SHORT = 2;
      private static final int NONDEFAULT_INT = 3;
      private static final long NONDEFAULT_LONG = 4;
      private static final float NONDEFAULT_FLOAT = 5;
      private static final double NONDEFAULT_DOUBLE = 6;
      private static final String NONDEFAULT_STRING = "B";
  
      @Rule
      public final ExpectedException expectedException = ExpectedException.none();
  
      @SuppressWarnings("UnusedDeclaration")
      public interface SampleMXBean {
          boolean getBoolean();
  
          char getChar();
  
          byte getByte();
  
          short getShort();
  
          int getInt();
  
          long getLong();
  
          float getFloat();
  
          double getDouble();
  
          String getString();
  
          void operation();
  
          String concat(String left, String right);
      }
  
      /**
       * Test class for abstract {@link AbstractJmxBridge}.
       * <p>
       * As well as a test class, this serves as an example for the idiomatic usage {@link AbstractJmxBridge}.
       */
      private static class SampleJmxBridge extends AbstractJmxBridge<SampleMXBean> implements SampleMXBean {
          /**
           * Counter for uniqueifying jmx object names.
           */
          private static final AtomicInteger nextJmxInstance = new AtomicInteger();
  
          private int operationCount;
  
          public SampleJmxBridge() {
              super(JmxUtil.objectName(nextJmxInstance, "Sample"), SampleMXBean.class);
          }
  
          @Override
          protected SampleMXBean getMXBean() {
              return this;
          }
  
          public int getOperationCount() {
              return operationCount;
          }
  
          @Override
          public boolean getBoolean() {
              return NONDEFAULT_BOOLEAN;
          }
  
          @Override
          public char getChar() {
              return NONDEFAULT_CHAR;
          }
  
          @Override
          public byte getByte() {
              return NONDEFAULT_BYTE;
         }
 
         @Override
         public short getShort() {
             return NONDEFAULT_SHORT;
         }
 
         @Override
         public int getInt() {
             return NONDEFAULT_INT;
         }
 
         @Override
         public long getLong() {
             return NONDEFAULT_LONG;
         }
 
         @Override
         public float getFloat() {
             return NONDEFAULT_FLOAT;
         }
 
         @Override
         public double getDouble() {
             return NONDEFAULT_DOUBLE;
         }
 
         @Override
         public String getString() {
             return NONDEFAULT_STRING;
         }
 
         @Override
         public void operation() {
             ++operationCount;
         }
 
         @Override
         public String concat(final String left, final String right) {
             return left + right;
         }
     }
 
     private SampleJmxBridge sampleJmxBridge;
     private MBeanServer platformMBeanServer;
 
     @Before
     public void setUp() throws Exception {
         sampleJmxBridge = new SampleJmxBridge();
         platformMBeanServer = ManagementFactory.getPlatformMBeanServer();
     }
 
     @Test
     public void getObjectNameMentionsType() {
         final ObjectName objectName = sampleJmxBridge.getObjectName();
         assertThat(objectName.toString(), containsString("Sample"));
     }
 
     @Test
     public void notExposedToJmxBeforeRegister() throws Exception {
         final ObjectName objectName = sampleJmxBridge.getObjectName();
         expectedException.expect(InstanceNotFoundException.class);
         expectedException.expectMessage(objectName.toString());
         platformMBeanServer.invoke(objectName, "operation", new Object[0], new String[0]);
     }
 
     @Test
     public void registerExposesToJmx() throws Exception {
         final ObjectName objectName = sampleJmxBridge.getObjectName();
         sampleJmxBridge.register();
 
         final int before = sampleJmxBridge.getOperationCount();
         platformMBeanServer.invoke(objectName, "operation", new Object[0], new String[0]);
         assertThat(sampleJmxBridge.getOperationCount(), is(before + 1));
     }
 
     @Test
     public void primitiveTypesAreReturnedBoxed() throws Exception {
         // Originally the proxy had some special case code around primitives, so i'm leaving these tests here as they not costly
 
         final ObjectName objectName = sampleJmxBridge.getObjectName();
         sampleJmxBridge.register();
 
         final Object aBoolean = platformMBeanServer.getAttribute(objectName, "Boolean");
         assertThat(aBoolean, instanceOf(Boolean.class));
         assertThat((Boolean) aBoolean, is(NONDEFAULT_BOOLEAN));
 
         final Object aChar = platformMBeanServer.getAttribute(objectName, "Char");
         assertThat(aChar, instanceOf(Character.class));
         assertThat((Character) aChar, is(NONDEFAULT_CHAR));
 
         final Object aByte = platformMBeanServer.getAttribute(objectName, "Byte");
         assertThat(aByte, instanceOf(Byte.class));
         assertThat((Byte) aByte, is(NONDEFAULT_BYTE));
 
         final Object aShort = platformMBeanServer.getAttribute(objectName, "Short");
         assertThat(aShort, instanceOf(Short.class));
         assertThat((Short) aShort, is(NONDEFAULT_SHORT));
 
         final Object anInt = platformMBeanServer.getAttribute(objectName, "Int");
         assertThat(anInt, instanceOf(Integer.class));
         assertThat((Integer) anInt, is(NONDEFAULT_INT));
 
         final Object aLong = platformMBeanServer.getAttribute(objectName, "Long");
         assertThat(aLong, instanceOf(Long.class));
         assertThat((Long) aLong, is(NONDEFAULT_LONG));
 
         final Object aFloat = platformMBeanServer.getAttribute(objectName, "Float");
         assertThat(aFloat, instanceOf(Float.class));
         assertThat((Float) aFloat, is(NONDEFAULT_FLOAT));
 
         final Object aDouble = platformMBeanServer.getAttribute(objectName, "Double");
         assertThat(aDouble, instanceOf(Double.class));
         assertThat((Double) aDouble, is(NONDEFAULT_DOUBLE));
 
         final Object aString = platformMBeanServer.getAttribute(objectName, "String");
         assertThat(aString, instanceOf(String.class));
         assertThat((String) aString, is(NONDEFAULT_STRING));
     }
 
     @Test
     public void parametersArePassedCorrectly() throws Exception {
         final ObjectName objectName = sampleJmxBridge.getObjectName();
         sampleJmxBridge.register();
 
         final Object[] params = {"left", "right"};
         final String[] signature = new String[]{String.class.getName(), String.class.getName()};
         final Object result = platformMBeanServer.invoke(objectName, "concat", params, signature);
         assertThat(result, instanceOf(String.class));
         assertThat((String) result, is("leftright"));
     }
 
     @Test
     public void notExposedToJmxAfterUnregister() throws Exception {
         final ObjectName objectName = sampleJmxBridge.getObjectName();
         sampleJmxBridge.register();
         sampleJmxBridge.unregister();
 
         expectedException.expect(InstanceNotFoundException.class);
         expectedException.expectMessage(objectName.toString());
         platformMBeanServer.invoke(objectName, "operation", new Object[0], new String[0]);
     }
 
     @Test
     public void throwsIllegalStateExceptionIfReferenceIsCleared() throws Exception {
         // This is as close to testing the garbage collection can be easily managed
         final ObjectName objectName = sampleJmxBridge.getObjectName();
         // registerInternal is just register but exposing state we can use to fake garbage collection.
         final AbstractJmxBridge.WeakMXBeanInvocationHandler<SampleMXBean> invocationHandler = sampleJmxBridge.registerInternal();
 
         // Quick check that registerInternal works as expected to validate the test
         final Object aString = platformMBeanServer.getAttribute(objectName, "String");
         assertThat(aString, instanceOf(String.class));
         assertThat((String) aString, is(NONDEFAULT_STRING));
 
         invocationHandler.getImplementationReference().clear();
 
         expectedException.expect(RuntimeMBeanException.class);
         expectedException.expectCause(Matchers.<Throwable>instanceOf(IllegalStateException.class));
         expectedException.expectMessage(objectName.toString());
         platformMBeanServer.invoke(objectName, "operation", new Object[0], new String[0]);
     }
 
     @Test
     public void usageAfterReferenceClearsCausesUnregister() throws Exception {
         final ObjectName objectName = sampleJmxBridge.getObjectName();
         final AbstractJmxBridge.WeakMXBeanInvocationHandler<SampleMXBean> invocationHandler = sampleJmxBridge.registerInternal();
         invocationHandler.getImplementationReference().clear();
 
         try {
             platformMBeanServer.invoke(objectName, "operation", new Object[0], new String[0]);
         } catch (RuntimeMBeanException ermb) {
             // Expected
         }
 
         // Note that this is the same exception shape as use before registration
         expectedException.expect(InstanceNotFoundException.class);
         expectedException.expectMessage(objectName.toString());
         platformMBeanServer.invoke(objectName, "operation", new Object[0], new String[0]);
     }
 }