Examples of java.util.logging.MemoryHandler

java.util.logging.MemoryHandler
Handler that buffers requests in a circular buffer in memory.
Normally this Handler simply stores incoming LogRecords into its memory buffer and discards earlier records. This buffering is very cheap and avoids formatting costs. On certain trigger conditions, the MemoryHandler will push out its current buffer contents to a target Handler, which will typically publish them to the outside world.
There are three main models for triggering a push of the buffer:
- An incoming LogRecord has a type that is greater than a pre-defined level, the pushLevel.
- An external class calls the push method explicitly.
- A subclass overrides the log method and scans each incoming LogRecord and calls push if a record matches some desired criteria.
Configuration: By default each MemoryHandler is initialized using the following LogManager configuration properties. If properties are not defined (or have invalid values) then the specified default values are used. If no default value is defined then a RuntimeException is thrown.
- java.util.logging.MemoryHandler.level specifies the level for the Handler (defaults to Level.ALL).
- java.util.logging.MemoryHandler.filter specifies the name of a Filter class to use (defaults to no Filter).
- java.util.logging.MemoryHandler.size defines the buffer size (defaults to 1000).
- java.util.logging.MemoryHandler.push defines the pushLevel (defaults to level.SEVERE).
- java.util.logging.MemoryHandler.target specifies the name of the target Handler class. (no default).
@version 1.26, 11/17/05 @since 1.4

    // null target
    try {
      props.remove("java.util.logging.MemoryHandler.target");
      manager.readConfiguration(EnvironmentHelper
          .PropertiesToInputStream(props));
      handler = new MemoryHandler();
      fail("should throw RuntimeException: target must be set");
    } catch (RuntimeException e) {
    }


    // invalid target
    try {
      props.put("java.util.logging.MemoryHandler.target", "badname");
      manager.readConfiguration(EnvironmentHelper
          .PropertiesToInputStream(props));
      handler = new MemoryHandler();
      fail("should throw RuntimeException: target must be valid");
    } catch (RuntimeException e) {
    }


    // invalid formatter
    initProps();
    props.put("java.util.logging.MemoryHandler.formatter", "badname");
    manager.readConfiguration(EnvironmentHelper
        .PropertiesToInputStream(props));
    handler = new MemoryHandler();
    assertTrue(handler.getFormatter() instanceof SimpleFormatter);


    // invalid level
    initProps();
    props.put("java.util.logging.MemoryHandler.level", "badname");
    manager.readConfiguration(EnvironmentHelper
        .PropertiesToInputStream(props));
    handler = new MemoryHandler();
    assertEquals(handler.getLevel(), Level.ALL);


    // invalid pushlevel
    initProps();
    props.put("java.util.logging.MemoryHandler.push", "badname");
    manager.readConfiguration(EnvironmentHelper
        .PropertiesToInputStream(props));
    handler = new MemoryHandler();
    assertEquals(handler.getPushLevel(), Level.SEVERE);


    // invalid filter
    initProps();
    props.put("java.util.logging.MemoryHandler.filter", "badname");
    manager.readConfiguration(EnvironmentHelper
        .PropertiesToInputStream(props));
    handler = new MemoryHandler();
    assertNull(handler.getFilter());


    // invalid size
    initProps();
    props.put("java.util.logging.MemoryHandler.size", "-1");
    manager.readConfiguration(EnvironmentHelper
        .PropertiesToInputStream(props));
    handler = new MemoryHandler();
    initProps();
    props.put("java.util.logging.MemoryHandler.size", "badsize");
    manager.readConfiguration(EnvironmentHelper
        .PropertiesToInputStream(props));
    handler = new MemoryHandler();


  }

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    props.put("java.util.logging.MemoryHandler.target", baseClassName
        + "$MockHandler");


    manager.readConfiguration(EnvironmentHelper
        .PropertiesToInputStream(props));
    handler = new MemoryHandler();
    assertNull(handler.getFilter());
    assertTrue(handler.getFormatter() instanceof SimpleFormatter);
    assertNull(handler.getEncoding());
    assertNotNull(handler.getErrorManager());
    assertEquals(handler.getLevel(), Level.ALL);

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  /*
   * Class under test for void MemoryHandler(Handler, int, Level)
   */
  public void testMemoryHandlerHandlerintLevel() {
    handler = new MemoryHandler(target, 2, Level.FINEST);
    assertTrue(handler.getFilter() instanceof MockFilter);
    assertTrue(handler.getFormatter() instanceof MockFormatter);
    assertNull(handler.getEncoding());
    assertNotNull(handler.getErrorManager());
    assertEquals(handler.getLevel(), Level.FINE);
    assertEquals(handler.getPushLevel(), Level.FINEST);
    assertNull(target.getFormatter());


    try {
      handler = new MemoryHandler(null, 2, Level.FINEST);
      fail("should throw NullPointerException");
    } catch (NullPointerException e) {
    }
    try {
      handler = new MemoryHandler(target, 2, null);
      fail("should throw NullPointerException");
    } catch (NullPointerException e) {
    }
    try {
      handler = new MemoryHandler(target, 0, Level.FINEST);
      fail("should throw IllegalArgumentException");
    } catch (IllegalArgumentException e) {
    }
    try {
      handler = new MemoryHandler(target, -1, Level.FINEST);
      fail("should throw IllegalArgumentException");
    } catch (IllegalArgumentException e) {
    }


  }

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Related Classes of java.util.logging.MemoryHandler

org.apache.harmony.logging.tests.java.util.logging.MemoryHandlerTest

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