Ejemplo n.º 1
0
  private Logger getModelMBeanLogger(String notificationType) throws MBeanException {
    // Get a copy to avoid synchronization
    ModelMBeanInfo info = getModelMBeanInfo();

    // First look if there is a suitable notification descriptor, otherwise use MBean descriptor
    Descriptor descriptor = null;
    Logger modelMBeanLogger = null;
    if (notificationType != null) {
      descriptor = info.getDescriptor(notificationType, "notification");
      modelMBeanLogger = findLogger(descriptor);
    }

    if (modelMBeanLogger == null) {
      descriptor = info.getMBeanDescriptor();
      modelMBeanLogger = findLogger(descriptor);
      if (modelMBeanLogger != null) return modelMBeanLogger;
    }

    return null;
  }
Ejemplo n.º 2
0
  public Object invoke(String method, Object[] arguments, String[] params)
      throws MBeanException, ReflectionException {
    if (method == null)
      throw new RuntimeOperationsException(
          new IllegalArgumentException(
              LocalizedStrings.MX4JModelMBean_METHOD_NAME_CANNOT_BE_NULL.toLocalizedString()));
    if (arguments == null) arguments = new Object[0];
    if (params == null) params = new String[0];

    Logger logger = getLogger();

    // Find operation descriptor
    ModelMBeanInfo info = getModelMBeanInfo();
    if (info == null)
      throw new MBeanException(
          new ServiceNotFoundException(
              LocalizedStrings.MX4JModelMBean_MODELMBEANINFO_IS_NULL.toLocalizedString()));
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("ModelMBeanInfo is: " + info);

    // This is a clone, we use it read only
    ModelMBeanOperationInfo operInfo = info.getOperation(method);
    if (operInfo == null)
      throw new MBeanException(
          new ServiceNotFoundException(
              LocalizedStrings.MX4JModelMBean_CANNOT_FIND_MODELMBEANOPERATIONINFO_FOR_OPERATION_0
                  .toLocalizedString(method)));
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("Operation info is: " + operInfo);

    // This descriptor is a clone
    Descriptor operationDescriptor = operInfo.getDescriptor();
    if (operationDescriptor == null)
      throw new MBeanException(
          new ServiceNotFoundException(
              LocalizedStrings.MX4JModelMBean_OPERATION_DESCRIPTOR_FOR_OPERATION_0_CANNOT_BE_NULL
                  .toLocalizedString(method)));
    String role = (String) operationDescriptor.getFieldValue("role");
    if (role == null || !role.equals("operation"))
      throw new MBeanException(
          new ServiceNotFoundException(
              LocalizedStrings
                  .MX4JModelMBean_OPERATION_DESCRIPTOR_FIELD_ROLE_MUST_BE_OPERATION_NOT_0
                  .toLocalizedString(role)));
    if (logger.isEnabledFor(Logger.DEBUG))
      logger.debug("Operation descriptor is: " + operationDescriptor);

    // This returns a clone of the mbean descriptor, we use it read only
    Descriptor mbeanDescriptor = info.getMBeanDescriptor();
    if (mbeanDescriptor == null)
      throw new MBeanException(
          new ServiceNotFoundException(
              LocalizedStrings.MX4JModelMBean_MBEAN_DESCRIPTOR_CANNOT_BE_NULL.toLocalizedString()));
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("MBean descriptor is: " + mbeanDescriptor);

    Object returnValue = null;

    String lastUpdateField = "lastReturnedTimeStamp";

    // Check if the method should be invoked given the cache settings
    int staleness = getStaleness(operationDescriptor, mbeanDescriptor, lastUpdateField);

    if (staleness == ALWAYS_STALE || staleness == STALE) {
      if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Value is stale");

      // Find parameters classes
      Class[] parameters = null;
      try {
        parameters = Utils.loadClasses(Thread.currentThread().getContextClassLoader(), params);
      } catch (ClassNotFoundException x) {
        logger.error(LocalizedStrings.MX4JModelMBean_CANNOT_FIND_OPERATIONS_PARAMETER_CLASSES, x);
        throw new ReflectionException(x);
      }

      if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Invoking operation...");

      // Find target object
      Object target = resolveTargetObject(operationDescriptor);
      returnValue = invokeMethod(target, method, parameters, arguments);

      if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("Returned value is: " + returnValue);

      if (returnValue != null) {
        Class parameter = returnValue.getClass();
        Class declared = loadClassWithContextClassLoader(operInfo.getReturnType());

        checkAssignability(parameter, declared);
      }

      // Cache the new value only if caching is needed
      if (staleness != ALWAYS_STALE) {
        operationDescriptor.setField("lastReturnedValue", returnValue);
        operationDescriptor.setField(lastUpdateField, Long.valueOf(System.currentTimeMillis()));
        if (logger.isEnabledFor(Logger.TRACE)) {
          logger.trace("Returned value has been cached");
        }

        // And now replace the descriptor with the updated clone
        info.setDescriptor(operationDescriptor, "operation");
      }

      if (logger.isEnabledFor(Logger.DEBUG))
        logger.debug("invoke for operation " + method + " returns invoked value: " + returnValue);
    } else {
      // Return cached value
      returnValue = operationDescriptor.getFieldValue("lastReturnedValue");

      if (returnValue != null) {
        Class parameter = returnValue.getClass();
        Class declared = loadClassWithContextClassLoader(operInfo.getReturnType());

        checkAssignability(parameter, declared);
      }

      if (logger.isEnabledFor(Logger.DEBUG))
        logger.debug("invoke for operation " + method + " returns cached value: " + returnValue);
    }

    // As an extension, persist this model mbean also after operation invocation, but using only
    // settings provided in the operation descriptor, without falling back to defaults set in
    // the MBean descriptor
    boolean persistNow = shouldPersistNow(operationDescriptor, null, lastUpdateField);
    int impact = operInfo.getImpact();
    if (persistNow && impact != MBeanOperationInfo.INFO) {
      if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Persisting this ModelMBean...");
      try {
        store();
        if (logger.isEnabledFor(Logger.TRACE)) logger.trace("ModelMBean persisted successfully");
      } catch (Exception x) {
        logger.error(
            LocalizedStrings.MX4JModelMBean_CANNOT_STORE_MODELMBEAN_AFTER_OPERATION_INVOCATION, x);
        if (x instanceof MBeanException) throw (MBeanException) x;
        else throw new MBeanException(x);
      }
    }

    return returnValue;
  }
Ejemplo n.º 3
0
  public void setAttribute(Attribute attribute)
      throws AttributeNotFoundException, InvalidAttributeValueException, MBeanException,
          ReflectionException {
    if (attribute == null)
      throw new RuntimeOperationsException(
          new IllegalArgumentException(
              LocalizedStrings.MX4JModelMBean_ATTRIBUTE_CANNOT_BE_NULL.toLocalizedString()));

    Logger logger = getLogger();

    // No need to synchronize: I work mostly on clones
    // I want the real info, not its clone
    ModelMBeanInfo info = getModelMBeanInfo();
    if (info == null)
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_MODELMBEANINFO_IS_NULL.toLocalizedString());
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("ModelMBeanInfo is: " + info);

    String attrName = attribute.getName();
    Object attrValue = attribute.getValue();

    // This is a clone, we use it read only
    ModelMBeanAttributeInfo attrInfo = info.getAttribute(attrName);
    if (attrInfo == null)
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_CANNOT_FIND_MODELMBEANATTRIBUTEINFO_FOR_ATTRIBUTE_0
              .toLocalizedString(attrName));
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("Attribute info is: " + attrInfo);

    if (!attrInfo.isWritable())
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_ATTRIBUTE_0_IS_NOT_WRITABLE.toLocalizedString(attrName));

    // This returns a clone of the mbean descriptor, we use it read only
    Descriptor mbeanDescriptor = info.getMBeanDescriptor();
    if (mbeanDescriptor == null)
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_MBEAN_DESCRIPTOR_CANNOT_BE_NULL.toLocalizedString());
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("MBean descriptor is: " + mbeanDescriptor);

    // This descriptor is a clone
    Descriptor attributeDescriptor = attrInfo.getDescriptor();
    if (attributeDescriptor == null)
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_ATTRIBUTE_DESCRIPTOR_FOR_ATTRIBUTE_0_CANNOT_BE_NULL
              .toLocalizedString(attrName));
    if (logger.isEnabledFor(Logger.DEBUG))
      logger.debug("Attribute descriptor is: " + attributeDescriptor);

    String lastUpdateField = "lastUpdatedTimeStamp";

    Object oldValue = null;
    try {
      oldValue = getAttribute(attrName);
      if (logger.isEnabledFor(Logger.DEBUG))
        logger.debug("Previous value of attribute " + attrName + ": " + oldValue);
    } catch (Exception x) {
      if (logger.isEnabledFor(Logger.DEBUG))
        logger.debug("Cannot get previous value of attribute " + attrName, x);
    }

    // Check if setMethod is present
    String method = (String) attributeDescriptor.getFieldValue("setMethod");
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("setMethod field is: " + method);
    if (method != null) {
      Class declared = loadClassWithContextClassLoader(attrInfo.getType());
      if (attrValue != null) {
        Class parameter = attrValue.getClass();
        checkAssignability(parameter, declared);
      }

      // As an extension, allow attributes to be called on target objects also
      Object target = resolveTargetObject(attributeDescriptor);
      invokeMethod(target, method, new Class[] {declared}, new Object[] {attrValue});

      // Cache the value only if currencyTimeLimit is not 0, ie it is not always stale
      int staleness = getStaleness(attributeDescriptor, mbeanDescriptor, lastUpdateField);
      if (staleness != ALWAYS_STALE) {
        attributeDescriptor.setField("value", attrValue);
        attributeDescriptor.setField(lastUpdateField, Long.valueOf(System.currentTimeMillis()));
        if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Attribute's value has been cached");
      } else {
        if (logger.isEnabledFor(Logger.TRACE))
          logger.trace("Always stale, avoiding to cache attribute's value");
      }
    } else {
      if (attrValue != null) {
        Class parameter = attrValue.getClass();
        Class declared = loadClassWithContextClassLoader(attrInfo.getType());

        checkAssignability(parameter, declared);
      }

      // Always store the value in the descriptor: no setMethod
      attributeDescriptor.setField("value", attrValue);
    }

    // And now replace the descriptor with the updated clone
    info.setDescriptor(attributeDescriptor, "attribute");

    // Send notifications to listeners
    if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Sending attribute change notifications");
    sendAttributeChangeNotification(new Attribute(attrName, oldValue), attribute);

    // Persist this ModelMBean
    boolean persistNow = shouldPersistNow(attributeDescriptor, mbeanDescriptor, lastUpdateField);
    if (persistNow) {
      if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Persisting this ModelMBean...");
      try {
        store();
        if (logger.isEnabledFor(Logger.TRACE)) logger.trace("ModelMBean persisted successfully");
      } catch (Exception x) {
        logger.error(LocalizedStrings.MX4JModelMBean_CANNOT_STORE_MODELMBEAN_AFTER_SETATTRIBUTE, x);
        if (x instanceof MBeanException) throw (MBeanException) x;
        else throw new MBeanException(x);
      }
    }
  }
Ejemplo n.º 4
0
  public Object getAttribute(String attribute)
      throws AttributeNotFoundException, MBeanException, ReflectionException {
    if (attribute == null)
      throw new RuntimeOperationsException(
          new IllegalArgumentException(
              LocalizedStrings.MX4JModelMBean_ATTRIBUTE_NAME_CANNOT_BE_NULL.toLocalizedString()));

    Logger logger = getLogger();

    // I want the real info, not its clone
    ModelMBeanInfo info = getModelMBeanInfo();
    if (info == null)
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_MODELMBEANINFO_IS_NULL.toLocalizedString());
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("ModelMBeanInfo is: " + info);

    // This is a clone, we use it read only
    ModelMBeanAttributeInfo attrInfo = info.getAttribute(attribute);
    if (attrInfo == null)
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_CANNOT_FIND_MODELMBEANATTRIBUTEINFO_FOR_ATTRIBUTE_0
              .toLocalizedString(attribute));
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("Attribute info is: " + attrInfo);
    if (!attrInfo.isReadable())
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_ATTRIBUTE_0_IS_NOT_READABLE.toLocalizedString(attribute));

    // This returns a clone of the mbean descriptor, we use it read only
    Descriptor mbeanDescriptor = info.getMBeanDescriptor();
    if (mbeanDescriptor == null)
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_MBEAN_DESCRIPTOR_CANNOT_BE_NULL.toLocalizedString());
    if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("MBean descriptor is: " + mbeanDescriptor);

    // This descriptor is a clone
    Descriptor attributeDescriptor = attrInfo.getDescriptor();
    if (attributeDescriptor == null)
      throw new AttributeNotFoundException(
          LocalizedStrings.MX4JModelMBean_ATTRIBUTE_DESCRIPTOR_FOR_ATTRIBUTE_0_CANNOT_BE_NULL
              .toLocalizedString(attribute));
    if (logger.isEnabledFor(Logger.DEBUG))
      logger.debug("Attribute descriptor is: " + attributeDescriptor);

    Object returnValue = null;

    String lastUpdateField = "lastUpdatedTimeStamp";

    int staleness = getStaleness(attributeDescriptor, mbeanDescriptor, lastUpdateField);

    if (staleness == ALWAYS_STALE || staleness == STALE) {
      if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Value is stale");

      String getter = (String) attributeDescriptor.getFieldValue("getMethod");
      if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("getMethod field is: " + getter);
      if (getter == null) {
        // No getter, use default value
        returnValue = attributeDescriptor.getFieldValue("default");

        if (returnValue != null) {
          // Check if the return type is of the same type
          // As an extension allow covariant return type
          Class returned = returnValue.getClass();
          Class declared = loadClassWithContextClassLoader(attrInfo.getType());

          checkAssignability(returned, declared);
        }

        if (logger.isEnabledFor(Logger.DEBUG))
          logger.debug(
              "getAttribute for attribute " + attribute + " returns default value: " + returnValue);
      } else {
        if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Invoking attribute getter...");
        // As an extension, allow attributes to be called on target objects also
        Object target = resolveTargetObject(attributeDescriptor);
        returnValue = invokeMethod(target, getter, new Class[0], new Object[0]);
        if (logger.isEnabledFor(Logger.DEBUG)) logger.debug("Returned value is: " + returnValue);

        if (returnValue != null) {
          // Check if the return type is of the same type
          // As an extension allow covariant return type
          Class returned = returnValue.getClass();
          Class declared = loadClassWithContextClassLoader(attrInfo.getType());

          checkAssignability(returned, declared);
        }

        // Cache the new value only if caching is needed
        if (staleness != ALWAYS_STALE) {
          attributeDescriptor.setField("value", returnValue);
          attributeDescriptor.setField(lastUpdateField, Long.valueOf(System.currentTimeMillis()));
          if (logger.isEnabledFor(Logger.TRACE)) logger.trace("Returned value has been cached");

          // And now replace the descriptor with the updated clone
          info.setDescriptor(attributeDescriptor, "attribute");
        }

        if (logger.isEnabledFor(Logger.DEBUG))
          logger.debug(
              "getAttribute for attribute " + attribute + " returns invoked value: " + returnValue);
      }
    } else {
      // Return cached value
      returnValue = attributeDescriptor.getFieldValue("value");

      if (returnValue != null) {
        // Check if the return type is of the same type
        // As an extension allow covariant return type
        Class returned = returnValue.getClass();
        Class declared = loadClassWithContextClassLoader(attrInfo.getType());

        checkAssignability(returned, declared);
      }

      if (logger.isEnabledFor(Logger.DEBUG))
        logger.debug(
            "getAttribute for attribute " + attribute + " returns cached value: " + returnValue);
    }

    // Puff, everything went ok
    return returnValue;
  }
Ejemplo n.º 5
0
  private PersisterMBean findPersister() throws MBeanException, InstanceNotFoundException {
    Logger logger = getLogger();

    ModelMBeanInfo info = getModelMBeanInfo();
    if (info == null) {
      // Not yet initialized
      if (logger.isEnabledFor(Logger.TRACE))
        logger.trace("Can't find persister, ModelMBeanInfo is null");
      return null;
    }
    Descriptor mbeanDescriptor = info.getMBeanDescriptor();
    if (mbeanDescriptor == null) {
      // This is normally should not happen if ModelMBeanInfoSupport is used
      if (logger.isEnabledFor(Logger.TRACE))
        logger.trace("Can't find persister, MBean descriptor is null");
      return null;
    }

    String location = (String) mbeanDescriptor.getFieldValue("persistLocation");
    String name = (String) mbeanDescriptor.getFieldValue("persistName");
    String mbeanName = (String) mbeanDescriptor.getFieldValue("name");
    if (logger.isEnabledFor(Logger.DEBUG))
      logger.debug("Persistence fields: location=" + location + ", name=" + name);

    if (mbeanName == null && name == null) {
      if (logger.isEnabledFor(Logger.DEBUG))
        logger.debug("Persistence is not supported by this ModelMBean");
      return null;
    }

    // Try to see if this mbean should delegate to another mbean
    if (name != null) {
      try {
        ObjectName objectName = new ObjectName(name.trim());
        // OK, a valid object name
        MBeanServer server = getMBeanServer();
        if (server == null)
          throw new MBeanException(
              new IllegalStateException(
                  LocalizedStrings.MX4JModelMBean_MX4JMODELMBEAN_IS_NOT_REGISTERED
                      .toLocalizedString()));

        if (server.isRegistered(objectName)
            && server.isInstanceOf(objectName, PersisterMBean.class.getName())) {
          // OK, the given mbean is registered with this mbean server
          PersisterMBean persister = new MBeanPersister(server, objectName);
          if (logger.isEnabledFor(Logger.DEBUG))
            logger.debug("Persistence is delegated to this MBean: " + objectName);
          return persister;
        } else {
          throw new InstanceNotFoundException(objectName.toString());
        }
      } catch (MalformedObjectNameException ignored) {
        // It does not delegates to another mbean, use default
        if (logger.isEnabledFor(Logger.TRACE))
          logger.trace("Persistence is not delegated to another MBean");
      }

      // Default is serialization to file
      FilePersister persister = new FilePersister(location, name);
      if (logger.isEnabledFor(Logger.DEBUG))
        logger.debug("Persistence is realized through file system in " + persister.getFileName());
      return persister;
    } else {
      // Only location given, use MBean name
      FilePersister persister = new FilePersister(location, mbeanName);
      if (logger.isEnabledFor(Logger.DEBUG))
        logger.debug("Persistence is realized through file system in " + persister.getFileName());
      return persister;
    }
  }