Package org.apache.tomcat.util.modeler

Class Registry

java.lang.Object
org.apache.tomcat.util.modeler.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.
Author:
Craig R. McClanahan, Costin Manolache

  • Constructor Details

    • Registry

      public Registry()

  • Method Details

    • 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)
      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
      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

    • preRegister

      public ObjectName preRegister(MBeanServer server, ObjectName name) throws Exception
      Specified by:
      preRegister in interface MBeanRegistration
      Throws:
      Exception

    • postRegister

      public void postRegister(Boolean registrationDone)
      Specified by:
      postRegister in interface MBeanRegistration

    • preDeregister

      public void preDeregister() throws Exception
      Specified by:
      preDeregister in interface MBeanRegistration
      Throws:
      Exception

    • postDeregister

      public void postDeregister()
      Specified by:
      postDeregister in interface MBeanRegistration