Class Registry

  • All Implemented Interfaces:
    MBeanRegistration, RegistryMBean

    public class Registry
    extends Object
    implements RegistryMBean, MBeanRegistration
    Registry for modeler MBeans. This is the main entry point into modeler. It provides methods to create and manipulate model mbeans and simplify their use. This class is itself an mbean. IMPORTANT: public methods not marked with @since x.x are experimental or internal. Should not be used.
    Author:
    Craig R. McClanahan, Costin Manolache
    • Constructor Detail

      • Registry

        public Registry()
    • Method Detail

      • getRegistry

        public static Registry getRegistry​(Object key,
                                           Object guard)
        Factory method to create (if necessary) and return our Registry instance.
        Parameters:
        key - Unused
        guard - Prevent access to the registry by untrusted components
        Returns:
        the registry
        Since:
        1.1
      • stop

        public void stop()
        Lifecycle method - clean up the registry metadata. Called from resetMetadata().
        Specified by:
        stop in interface RegistryMBean
        Since:
        1.1
      • registerComponent

        public void registerComponent​(Object bean,
                                      String oname,
                                      String type)
                               throws Exception
        Register a bean by creating a modeler mbean and adding it to the MBeanServer. If metadata is not loaded, we'll look up and read a file named "mbeans-descriptors.ser" or "mbeans-descriptors.xml" in the same package or parent. If the bean is an instance of DynamicMBean. it's metadata will be converted to a model mbean and we'll wrap it - so modeler services will be supported If the metadata is still not found, introspection will be used to extract it automatically. If an mbean is already registered under this name, it'll be first unregistered. If the component implements MBeanRegistration, the methods will be called. If the method has a method "setRegistry" that takes a RegistryMBean as parameter, it'll be called with the current registry.
        Specified by:
        registerComponent in interface RegistryMBean
        Parameters:
        bean - Object to be registered
        oname - Name used for registration
        type - The type of the mbean, as declared in mbeans-descriptors. If null, the name of the class will be used. This can be used as a hint or by subclasses.
        Throws:
        Exception - if a registration error occurred
        Since:
        1.1
      • unregisterComponent

        public void unregisterComponent​(String oname)
        Unregister a component. We'll first check if it is registered, and mask all errors. This is mostly a helper.
        Specified by:
        unregisterComponent in interface RegistryMBean
        Parameters:
        oname - Name used for unregistration
        Since:
        1.1
      • invoke

        public void invoke​(List<ObjectName> mbeans,
                           String operation,
                           boolean failFirst)
                    throws Exception
        Invoke a operation on a list of mbeans. Can be used to implement lifecycle operations.
        Specified by:
        invoke in interface RegistryMBean
        Parameters:
        mbeans - list of ObjectName on which we'll invoke the operations
        operation - Name of the operation ( init, start, stop, etc)
        failFirst - If false, exceptions will be ignored
        Throws:
        Exception - Error invoking operation
        Since:
        1.1
      • getId

        public int getId​(String domain,
                         String name)
        Return an int ID for faster access. Will be used for notifications and for other operations we want to optimize.
        Specified by:
        getId in interface RegistryMBean
        Parameters:
        domain - Namespace
        name - Type of the notification
        Returns:
        A unique id for the domain:name combination
        Since:
        1.1
      • addManagedBean

        public void addManagedBean​(ManagedBean bean)
        Add a new bean metadata to the set of beans known to this registry. This is used by internal components.
        Parameters:
        bean - The managed bean to be added
        Since:
        1.0
      • findManagedBean

        public ManagedBean findManagedBean​(String name)
        Find and return the managed bean definition for the specified bean name, if any; otherwise return null.
        Parameters:
        name - Name of the managed bean to be returned. Since 1.1, both short names or the full name of the class can be used.
        Returns:
        the managed bean
        Since:
        1.0
      • getType

        public String getType​(ObjectName oname,
                              String attName)
        Get the type of an attribute of the object, from the metadata.
        Parameters:
        oname - The bean name
        attName - The attribute name
        Returns:
        null if metadata about the attribute is not found
        Since:
        1.1
      • getMethodInfo

        public MBeanOperationInfo getMethodInfo​(ObjectName oname,
                                                String opName)
        Find the operation info for a method
        Parameters:
        oname - The bean name
        opName - The operation name
        Returns:
        the operation info for the specified operation
      • getMethodInfo

        public MBeanOperationInfo getMethodInfo​(ObjectName oname,
                                                String opName,
                                                int argCount)
                                         throws InstanceNotFoundException
        Find the operation info for a method.
        Parameters:
        oname - The bean name
        opName - The operation name
        argCount - The number of arguments to the method
        Returns:
        the operation info for the specified operation
        Throws:
        InstanceNotFoundException - If the object name is not bound to an MBean
      • unregisterComponent

        public void unregisterComponent​(ObjectName oname)
        Unregister a component. This is just a helper that avoids exceptions by checking if the mbean is already registered
        Parameters:
        oname - The bean name
      • getMBeanServer

        public MBeanServer getMBeanServer()
        Factory method to create (if necessary) and return our MBeanServer instance.
        Returns:
        the MBean server
      • findManagedBean

        public ManagedBean findManagedBean​(Object bean,
                                           Class<?> beanClass,
                                           String type)
                                    throws Exception
        Find or load metadata.
        Parameters:
        bean - The bean
        beanClass - The bean class
        type - The registry type
        Returns:
        the managed bean
        Throws:
        Exception - An error occurred
      • convertValue

        public Object convertValue​(String type,
                                   String value)
        EXPERIMENTAL Convert a string to object, based on type. Used by several components. We could provide some pluggability. It is here to keep things consistent and avoid duplication in other tasks
        Parameters:
        type - Fully qualified class name of the resulting value
        value - String value to be converted
        Returns:
        Converted value
      • load

        public List<ObjectName> load​(String sourceType,
                                     Object source,
                                     String param)
                              throws Exception
        Experimental. Load descriptors.
        Parameters:
        sourceType - The source type
        source - The bean
        param - A type to load
        Returns:
        List of descriptors
        Throws:
        Exception - Error loading descriptors
      • registerComponent

        public void registerComponent​(Object bean,
                                      ObjectName oname,
                                      String type)
                               throws Exception
        Register a component
        Parameters:
        bean - The bean
        oname - The object name
        type - The registry type
        Throws:
        Exception - Error registering component
      • loadDescriptors

        public void loadDescriptors​(String packageName,
                                    ClassLoader classLoader)
        Lookup the component descriptor in the package and in the parent packages.
        Parameters:
        packageName - The package name
        classLoader - The class loader