org.apache.tomcat.util.modeler

Interface RegistryMBean

All Known Implementing Classes:

Registry

public interface RegistryMBean

Interface for modeler MBeans. This is the main entry point into modeler. It provides methods to create and manipulate model mbeans and simplify their use. Starting with version 1.1, this is no longer a singleton and the static methods are strongly deprecated. In a container environment we can expect different applications to use different registries.

Since:

1.1

Author:

Craig R. McClanahan, Costin Manolache

Method Summary

Modifier and Type	Method and Description
int	getId(String domain, String name) Return an int ID for faster access.
void	invoke(List<ObjectName> mbeans, String operation, boolean failFirst) Invoke an operation on a set of mbeans.
void	registerComponent(Object bean, String oname, String type) Register a bean by creating a modeler mbean and adding it to the MBeanServer.
void	stop() Reset all metadata cached by this registry.
void	unregisterComponent(String oname) Unregister a component.

Method Detail

invoke

void invoke(List<ObjectName> mbeans,
            String operation,
            boolean failFirst)
     throws Exception

Invoke an operation on a set of mbeans.

Parameters:

mbeans - List of ObjectNames

operation - Operation to perform. Typically "init" "start" "stop" or "destroy"

failFirst - Behavior in case of exceptions - if false we'll ignore errors

Throws:

Exception - Error invoking operation

registerComponent

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.

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 - Error registering MBean

Since:

1.1

unregisterComponent

void unregisterComponent(String oname)

Unregister a component. We'll first check if it is registered, and mask all errors. This is mostly a helper.

Parameters:

oname - The name used by the bean

Since:

1.1

getId

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.

Parameters:

domain - Namespace

name - Type of the notification

Returns:

An unique id for the domain:name combination

Since:

1.1

stop

void stop()

Reset all metadata cached by this registry. Should be called to support reloading. Existing mbeans will not be affected or modified. It will be called automatically if the Registry is unregistered.

Since:

1.1