org.springframework.jmx.export.assembler

## Class AbstractReflectiveMBeanInfoAssembler

- java.lang.Object
- - org.springframework.jmx.export.assembler.AbstractMBeanInfoAssembler
  - - org.springframework.jmx.export.assembler.AbstractReflectiveMBeanInfoAssembler

- All Implemented Interfaces:
    MBeanInfoAssembler
  Direct Known Subclasses:
    AbstractConfigurableMBeanInfoAssembler, MetadataMBeanInfoAssembler

      public abstract class AbstractReflectiveMBeanInfoAssembler
      extends AbstractMBeanInfoAssembler

  Builds on the `AbstractMBeanInfoAssembler` superclass to add a basic algorithm for building metadata based on the reflective metadata of the MBean class.

  The logic for creating MBean metadata from the reflective metadata is contained in this class, but this class makes no decisions as to which methods and properties are to be exposed. Instead it gives subclasses a chance to 'vote' on each property or method through the `includeXXX` methods.

  Subclasses are also given the opportunity to populate attribute and operation metadata with additional descriptors once the metadata is assembled through the `populateXXXDescriptor` methods.

  Since:
    1.2
  Author:
    Rob Harrop, Juergen Hoeller, David Boden
  See Also:
    `includeOperation(java.lang.reflect.Method, java.lang.String)`, `includeReadAttribute(java.lang.reflect.Method, java.lang.String)`, `includeWriteAttribute(java.lang.reflect.Method, java.lang.String)`, `populateAttributeDescriptor(javax.management.Descriptor, java.lang.reflect.Method, java.lang.reflect.Method, java.lang.String)`, `populateOperationDescriptor(javax.management.Descriptor, java.lang.reflect.Method, java.lang.String)`

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected static int` | `ATTRIBUTE_OPERATION_VISIBILITY` Lowest visibility, used for operations that correspond to accessors or mutators for attributes.
    `protected static String` | `FIELD_CLASS` Constant identifier for the class field in a JMX `Descriptor`.
    `protected static String` | `FIELD_CURRENCY_TIME_LIMIT` Constant identifier for the currency time limit field in a JMX `Descriptor`.
    `protected static String` | `FIELD_DEFAULT` Constant identifier for the default field in a JMX `Descriptor`.
    `protected static String` | `FIELD_DISPLAY_NAME` Constant identifier for the displayName field in a JMX `Descriptor`.
    `protected static String` | `FIELD_GET_METHOD` Identifies a getter method in a JMX `Descriptor`.
    `protected static String` | `FIELD_LOG` Constant identifier for the log field in a JMX `Descriptor`.
    `protected static String` | `FIELD_LOG_FILE` Constant identifier for the logfile field in a JMX `Descriptor`.
    `protected static String` | `FIELD_METRIC_CATEGORY` Constant identifier for the custom metricCategory field in a JMX `Descriptor`.
    `protected static String` | `FIELD_METRIC_TYPE` Constant identifier for the metricType field in a JMX `Descriptor`.
    `protected static String` | `FIELD_PERSIST_LOCATION` Constant identifier for the persistLocation field in a JMX `Descriptor`.
    `protected static String` | `FIELD_PERSIST_NAME` Constant identifier for the persistName field in a JMX `Descriptor`.
    `protected static String` | `FIELD_PERSIST_PERIOD` Constant identifier for the persistPeriod field in a JMX `Descriptor`.
    `protected static String` | `FIELD_PERSIST_POLICY` Constant identifier for the persistPolicy field in a JMX `Descriptor`.
    `protected static String` | `FIELD_ROLE` Constant identifier for the role field in a JMX `Descriptor`.
    `protected static String` | `FIELD_SET_METHOD` Identifies a setter method in a JMX `Descriptor`.
    `protected static String` | `FIELD_UNITS` Constant identifier for the units field in a JMX `Descriptor`.
    `protected static String` | `FIELD_VISIBILITY` Constant identifier for the visibility field in a JMX `Descriptor`.
    `protected static String` | `ROLE_GETTER` Constant identifier for the getter role field value in a JMX `Descriptor`.
    `protected static String` | `ROLE_OPERATION` Identifies an operation (method) in a JMX `Descriptor`.
    `protected static String` | `ROLE_SETTER` Constant identifier for the setter role field value in a JMX `Descriptor`.

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `AbstractReflectiveMBeanInfoAssembler()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `applyCurrencyTimeLimit(Descriptor desc, int currencyTimeLimit)` Apply the given JMX "currencyTimeLimit" value to the given descriptor.
    `protected void` | `applyDefaultCurrencyTimeLimit(Descriptor desc)` Set the `currencyTimeLimit` field to the specified "defaultCurrencyTimeLimit", if any (by default none).
    `protected ModelMBeanOperationInfo` | `createModelMBeanOperationInfo(Method method, String name, String beanKey)` Creates an instance of `ModelMBeanOperationInfo` for the given method.
    `protected String` | `getAttributeDescription(PropertyDescriptor propertyDescriptor, String beanKey)` Get the description for a particular attribute.
    `protected ModelMBeanAttributeInfo[]` | `getAttributeInfo(Object managedBean, String beanKey)` Iterate through all properties on the MBean class and gives subclasses the chance to vote on the inclusion of both the accessor and mutator.
    `protected Class` | `getClassForDescriptor(Object managedBean)` Return the class to be used for the JMX descriptor field "class".
    `protected Integer` | `getDefaultCurrencyTimeLimit()` Return default value for the JMX field "currencyTimeLimit", if any.
    `protected String` | `getOperationDescription(Method method, String beanKey)` Get the description for a particular operation.
    `protected ModelMBeanOperationInfo[]` | `getOperationInfo(Object managedBean, String beanKey)` Iterate through all methods on the MBean class and gives subclasses the chance to vote on their inclusion.
    `protected MBeanParameterInfo[]` | `getOperationParameters(Method method, String beanKey)` Create parameter info for the given method.
    `protected ParameterNameDiscoverer` | `getParameterNameDiscoverer()` Return the ParameterNameDiscoverer to use for resolving method parameter names if needed (may be `null` in order to skip parameter detection).
    `protected abstract boolean` | `includeOperation(Method method, String beanKey)` Allows subclasses to vote on the inclusion of a particular operation.
    `protected abstract boolean` | `includeReadAttribute(Method method, String beanKey)` Allows subclasses to vote on the inclusion of a particular attribute accessor.
    `protected abstract boolean` | `includeWriteAttribute(Method method, String beanKey)` Allows subclasses to vote on the inclusion of a particular attribute mutator.
    `protected boolean` | `isExposeClassDescriptor()` Return whether to expose the JMX descriptor field "class" for managed operations.
    `protected boolean` | `isUseStrictCasing()` Return whether strict casing for attributes is enabled.
    `protected void` | `populateAttributeDescriptor(Descriptor desc, Method getter, Method setter, String beanKey)` Allows subclasses to add extra fields to the `Descriptor` for a particular attribute.
    `protected void` | `populateMBeanDescriptor(Descriptor descriptor, Object managedBean, String beanKey)` Allows subclasses to add extra fields to the `Descriptor` for an MBean.
    `protected void` | `populateOperationDescriptor(Descriptor desc, Method method, String beanKey)` Allows subclasses to add extra fields to the `Descriptor` for a particular operation.
    `void` | `setDefaultCurrencyTimeLimit(Integer defaultCurrencyTimeLimit)` Set the default for the JMX field "currencyTimeLimit".
    `void` | `setExposeClassDescriptor(boolean exposeClassDescriptor)` Set whether to expose the JMX descriptor field "class" for managed operations.
    `void` | `setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer)` Set the ParameterNameDiscoverer to use for resolving method parameter names if needed (e.g.
    `void` | `setUseStrictCasing(boolean useStrictCasing)` Set whether to use strict casing for attributes.

    - ### Methods inherited from class org.springframework.jmx.export.assembler.AbstractMBeanInfoAssembler

      `checkManagedBean, getClassName, getClassToExpose, getClassToExpose, getConstructorInfo, getDescription, getMBeanInfo, getNotificationInfo, getTargetClass`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### FIELD_GET_METHOD

          protected static final String FIELD_GET_METHOD

      Identifies a getter method in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_SET_METHOD

          protected static final String FIELD_SET_METHOD

      Identifies a setter method in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_ROLE

          protected static final String FIELD_ROLE

      Constant identifier for the role field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### ROLE_GETTER

          protected static final String ROLE_GETTER

      Constant identifier for the getter role field value in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### ROLE_SETTER

          protected static final String ROLE_SETTER

      Constant identifier for the setter role field value in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### ROLE_OPERATION

          protected static final String ROLE_OPERATION

      Identifies an operation (method) in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_VISIBILITY

          protected static final String FIELD_VISIBILITY

      Constant identifier for the visibility field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### ATTRIBUTE_OPERATION_VISIBILITY

          protected static final int ATTRIBUTE_OPERATION_VISIBILITY

      Lowest visibility, used for operations that correspond to accessors or mutators for attributes.
      See Also:
        `FIELD_VISIBILITY`, Constant Field Values

    - #### FIELD_CLASS

          protected static final String FIELD_CLASS

      Constant identifier for the class field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_LOG

          protected static final String FIELD_LOG

      Constant identifier for the log field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_LOG_FILE

          protected static final String FIELD_LOG_FILE

      Constant identifier for the logfile field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_CURRENCY_TIME_LIMIT

          protected static final String FIELD_CURRENCY_TIME_LIMIT

      Constant identifier for the currency time limit field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_DEFAULT

          protected static final String FIELD_DEFAULT

      Constant identifier for the default field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_PERSIST_POLICY

          protected static final String FIELD_PERSIST_POLICY

      Constant identifier for the persistPolicy field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_PERSIST_PERIOD

          protected static final String FIELD_PERSIST_PERIOD

      Constant identifier for the persistPeriod field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_PERSIST_LOCATION

          protected static final String FIELD_PERSIST_LOCATION

      Constant identifier for the persistLocation field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_PERSIST_NAME

          protected static final String FIELD_PERSIST_NAME

      Constant identifier for the persistName field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_DISPLAY_NAME

          protected static final String FIELD_DISPLAY_NAME

      Constant identifier for the displayName field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_UNITS

          protected static final String FIELD_UNITS

      Constant identifier for the units field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_METRIC_TYPE

          protected static final String FIELD_METRIC_TYPE

      Constant identifier for the metricType field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

    - #### FIELD_METRIC_CATEGORY

          protected static final String FIELD_METRIC_CATEGORY

      Constant identifier for the custom metricCategory field in a JMX `Descriptor`.
      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### AbstractReflectiveMBeanInfoAssembler

          public AbstractReflectiveMBeanInfoAssembler()

  - ### Method Detail

    - #### setDefaultCurrencyTimeLimit

          public void setDefaultCurrencyTimeLimit(Integer defaultCurrencyTimeLimit)

      Set the default for the JMX field "currencyTimeLimit". The default will usually indicate to never cache attribute values.

      Default is none, not explicitly setting that field, as recommended by the JMX 1.2 specification. This should result in "never cache" behavior, always reading attribute values freshly (which corresponds to a "currencyTimeLimit" of `-1` in JMX 1.2).

      However, some JMX implementations (that do not follow the JMX 1.2 spec in that respect) might require an explicit value to be set here to get "never cache" behavior: for example, JBoss 3.2.x.

      Note that the "currencyTimeLimit" value can also be specified on a managed attribute or operation. The default value will apply if not overridden with a "currencyTimeLimit" value `>= 0` there: a metadata "currencyTimeLimit" value of `-1` indicates to use the default; a value of `0` indicates to "always cache" and will be translated to `Integer.MAX_VALUE`; a positive value indicates the number of cache seconds.

      See Also:
        `AbstractJmxAttribute.setCurrencyTimeLimit(int)`, `applyCurrencyTimeLimit(javax.management.Descriptor, int)`

    - #### getDefaultCurrencyTimeLimit

          protected Integer getDefaultCurrencyTimeLimit()

      Return default value for the JMX field "currencyTimeLimit", if any.

    - #### setUseStrictCasing

          public void setUseStrictCasing(boolean useStrictCasing)

      Set whether to use strict casing for attributes. Enabled by default.

      When using strict casing, a JavaBean property with a getter such as `getFoo()` translates to an attribute called `Foo`. With strict casing disabled, `getFoo()` would translate to just `foo`.

    - #### isUseStrictCasing

          protected boolean isUseStrictCasing()

      Return whether strict casing for attributes is enabled.

    - #### setExposeClassDescriptor

          public void setExposeClassDescriptor(boolean exposeClassDescriptor)

      Set whether to expose the JMX descriptor field "class" for managed operations. Default is "false", letting the JMX implementation determine the actual class through reflection.

      Set this property to `true` for JMX implementations that require the "class" field to be specified, for example WebLogic's. In that case, Spring will expose the target class name there, in case of a plain bean instance or a CGLIB proxy. When encountering a JDK dynamic proxy, the first interface implemented by the proxy will be specified.

      WARNING: Review your proxy definitions when exposing a JDK dynamic proxy through JMX, in particular with this property turned to `true`: the specified interface list should start with your management interface in this case, with all other interfaces following. In general, consider exposing your target bean directly or a CGLIB proxy for it instead.

      See Also:
        `getClassForDescriptor(Object)`

    - #### isExposeClassDescriptor

          protected boolean isExposeClassDescriptor()

      Return whether to expose the JMX descriptor field "class" for managed operations.

    - #### setParameterNameDiscoverer

          public void setParameterNameDiscoverer(ParameterNameDiscoverer parameterNameDiscoverer)

      Set the ParameterNameDiscoverer to use for resolving method parameter names if needed (e.g. for parameter names of MBean operation methods).

      The default is `LocalVariableTableParameterNameDiscoverer`.

    - #### getParameterNameDiscoverer

          protected ParameterNameDiscoverer getParameterNameDiscoverer()

      Return the ParameterNameDiscoverer to use for resolving method parameter names if needed (may be `null` in order to skip parameter detection).

    - #### getAttributeInfo

          protected ModelMBeanAttributeInfo[] getAttributeInfo(Object managedBean,
                                                   String beanKey)
                                                        throws JMException

      Iterate through all properties on the MBean class and gives subclasses the chance to vote on the inclusion of both the accessor and mutator. If a particular accessor or mutator is voted for inclusion, the appropriate metadata is assembled and passed to the subclass for descriptor population.
      Specified by:
        `getAttributeInfo` in class `AbstractMBeanInfoAssembler`
      Parameters:
        `managedBean` - the bean instance (might be an AOP proxy)
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        the attribute metadata
      Throws:
        `JMException` - in case of errors
      See Also:
        `populateAttributeDescriptor(javax.management.Descriptor, java.lang.reflect.Method, java.lang.reflect.Method, java.lang.String)`

    - #### getOperationInfo

          protected ModelMBeanOperationInfo[] getOperationInfo(Object managedBean,
                                                   String beanKey)

      Iterate through all methods on the MBean class and gives subclasses the chance to vote on their inclusion. If a particular method corresponds to the accessor or mutator of an attribute that is inclued in the managment interface, then the corresponding operation is exposed with the "role" descriptor field set to the appropriate value.
      Specified by:
        `getOperationInfo` in class `AbstractMBeanInfoAssembler`
      Parameters:
        `managedBean` - the bean instance (might be an AOP proxy)
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        the operation metadata
      See Also:
        `populateOperationDescriptor(javax.management.Descriptor, java.lang.reflect.Method, java.lang.String)`

    - #### createModelMBeanOperationInfo

          protected ModelMBeanOperationInfo createModelMBeanOperationInfo(Method method,
                                                              String name,
                                                              String beanKey)

      Creates an instance of `ModelMBeanOperationInfo` for the given method. Populates the parameter info for the operation.
      Parameters:
        `method` - the `Method` to create a `ModelMBeanOperationInfo` for
        `name` - the logical name for the operation (method name or property name); not used by the default implementation but possibly by subclasses
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        the `ModelMBeanOperationInfo`

    - #### getClassForDescriptor

          protected Class getClassForDescriptor(Object managedBean)

      Return the class to be used for the JMX descriptor field "class". Only applied when the "exposeClassDescriptor" property is "true".

      The default implementation returns the first implemented interface for a JDK proxy, and the target class else.

      Parameters:
        `managedBean` - the bean instance (might be an AOP proxy)
      Returns:
        the class to expose in the descriptor field "class"
      See Also:
        `setExposeClassDescriptor(boolean)`, `AbstractMBeanInfoAssembler.getClassToExpose(Class)`, `AopProxyUtils.proxiedUserInterfaces(Object)`

    - #### includeReadAttribute

          protected abstract boolean includeReadAttribute(Method method,
                                     String beanKey)

      Allows subclasses to vote on the inclusion of a particular attribute accessor.
      Parameters:
        `method` - the accessor `Method`
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        `true` if the accessor should be included in the management interface, otherwise `false`

    - #### includeWriteAttribute

          protected abstract boolean includeWriteAttribute(Method method,
                                      String beanKey)

      Allows subclasses to vote on the inclusion of a particular attribute mutator.
      Parameters:
        `method` - the mutator `Method`.
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        `true` if the mutator should be included in the management interface, otherwise `false`

    - #### includeOperation

          protected abstract boolean includeOperation(Method method,
                                 String beanKey)

      Allows subclasses to vote on the inclusion of a particular operation.
      Parameters:
        `method` - the operation method
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        whether the operation should be included in the management interface

    - #### getAttributeDescription

          protected String getAttributeDescription(PropertyDescriptor propertyDescriptor,
                                       String beanKey)

      Get the description for a particular attribute.

      The default implementation returns a description for the operation that is the name of corresponding `Method`.

      Parameters:
        `propertyDescriptor` - the PropertyDescriptor for the attribute
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        the description for the attribute

    - #### getOperationDescription

          protected String getOperationDescription(Method method,
                                       String beanKey)

      Get the description for a particular operation.

      The default implementation returns a description for the operation that is the name of corresponding `Method`.

      Parameters:
        `method` - the operation method
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        the description for the operation

    - #### getOperationParameters

          protected MBeanParameterInfo[] getOperationParameters(Method method,
                                                    String beanKey)

      Create parameter info for the given method.

      The default implementation returns an empty array of `MBeanParameterInfo`.

      Parameters:
        `method` - the `Method` to get the parameter information for
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      Returns:
        the `MBeanParameterInfo` array

    - #### populateMBeanDescriptor

          protected void populateMBeanDescriptor(Descriptor descriptor,
                                     Object managedBean,
                                     String beanKey)

      Allows subclasses to add extra fields to the `Descriptor` for an MBean.

      The default implementation sets the `currencyTimeLimit` field to the specified "defaultCurrencyTimeLimit", if any (by default none).

      Overrides:
        `populateMBeanDescriptor` in class `AbstractMBeanInfoAssembler`
      Parameters:
        `descriptor` - the `Descriptor` for the MBean resource.
        `managedBean` - the bean instance (might be an AOP proxy)
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      See Also:
        `setDefaultCurrencyTimeLimit(Integer)`, `applyDefaultCurrencyTimeLimit(javax.management.Descriptor)`

    - #### populateAttributeDescriptor

          protected void populateAttributeDescriptor(Descriptor desc,
                                         Method getter,
                                         Method setter,
                                         String beanKey)

      Allows subclasses to add extra fields to the `Descriptor` for a particular attribute.

      The default implementation sets the `currencyTimeLimit` field to the specified "defaultCurrencyTimeLimit", if any (by default none).

      Parameters:
        `desc` - the attribute descriptor
        `getter` - the accessor method for the attribute
        `setter` - the mutator method for the attribute
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      See Also:
        `setDefaultCurrencyTimeLimit(Integer)`, `applyDefaultCurrencyTimeLimit(javax.management.Descriptor)`

    - #### populateOperationDescriptor

          protected void populateOperationDescriptor(Descriptor desc,
                                         Method method,
                                         String beanKey)

      Allows subclasses to add extra fields to the `Descriptor` for a particular operation.

      The default implementation sets the `currencyTimeLimit` field to the specified "defaultCurrencyTimeLimit", if any (by default none).

      Parameters:
        `desc` - the operation descriptor
        `method` - the method corresponding to the operation
        `beanKey` - the key associated with the MBean in the beans map of the `MBeanExporter`
      See Also:
        `setDefaultCurrencyTimeLimit(Integer)`, `applyDefaultCurrencyTimeLimit(javax.management.Descriptor)`

    - #### applyDefaultCurrencyTimeLimit

          protected final void applyDefaultCurrencyTimeLimit(Descriptor desc)

      Set the `currencyTimeLimit` field to the specified "defaultCurrencyTimeLimit", if any (by default none).
      Parameters:
        `desc` - the JMX attribute or operation descriptor
      See Also:
        `setDefaultCurrencyTimeLimit(Integer)`

    - #### applyCurrencyTimeLimit

          protected void applyCurrencyTimeLimit(Descriptor desc,
                                    int currencyTimeLimit)

      Apply the given JMX "currencyTimeLimit" value to the given descriptor.

      The default implementation sets a value `>0` as-is (as number of cache seconds), turns a value of `0` into `Integer.MAX_VALUE` ("always cache") and sets the "defaultCurrencyTimeLimit" (if any, indicating "never cache") in case of a value `<0`. This follows the recommendation in the JMX 1.2 specification.

      Parameters:
        `desc` - the JMX attribute or operation descriptor
        `currencyTimeLimit` - the "currencyTimeLimit" value to apply
      See Also:
        `setDefaultCurrencyTimeLimit(Integer)`, `applyDefaultCurrencyTimeLimit(javax.management.Descriptor)`