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Class com.sun.jaw.impl.agent.services.loader.rmi.NetClassLoader

java.lang.Object
   |
   +----java.lang.ClassLoader
           |
           +----com.sun.jaw.impl.agent.services.loader.rmi.NetClassLoader

public class NetClassLoader

extends ClassLoader

implements LibraryLoaderIf, Externalizable, ActivatableIf

The class loader can be instantiated at start time in the agent or dynamically. Several instances of the NetClassLoader can co-exist within the same agent.

When initializing the class loader, an object name must be assigned to the instance. The object name is used by the class loader for retrieving configuration information. So the following key properties need to be specified in the object name:

• host: The hostname where the class server is running. By default this is the local host.
• port: The port number to use. By default this is 1099.
• service: The service name of the RMI object acting as server. By default this is NetClassServer.
• secure: true, the classloader loads only classes signed by a trusted signer. false, the classloader loads any class signed/not-signed by a trusted/not-trusted signer. By default this is false.

See Also:

NetClassServerImpl

NetClassLoader()

Default constructor.

NetClassLoader(ObjectName)

Initialize the NetClassLoader service.

deleteCmf()

Deletes the net class loader.

getClassVersion()

Returns the version of this class.

getLibPaths()

Returns the current libpath used by the loader for storing native libraries

getLoaderName()

Gets the object name of this instance of NetClassLoader.

initCmf(Framework, ObjectName, boolean, ModificationList)

Initialize the NetClassLoader service.

isActive()

Tests if the NetClassLoader is active.

loadClass(String)

loadLibrary(String, String)

Loads a dynamic native library.

performStart()

Activates the NetClassLoader.

performStop()

Deactivates the NetClassLoader.

readExternal(ObjectInput)

This method reads the objects contents during Object Serialization.

setLibPaths(Vector)

Set library path from where native libraries are loaded

writeExternal(ObjectOutput)

This method saves the objects contents during Object Serialization.

 public NetClassLoader()

Default constructor.

 public NetClassLoader(ObjectName name)

Initialize the NetClassLoader service.

Parameters:

name - Object name containing configuration infotmation.

 public void initCmf(Framework cmf,
                     ObjectName name,
                     boolean db,
                     ModificationList list) throws InstanceAlreadyExistException

Initialize the NetClassLoader service. The method will declare the object to the Core Management Framework. The name of the class server as well as host/port information are contained in the object name.
For internal use only.

Parameters:

agent - The core management framework to register the service with.

name - Object name containing configuration information.

db - Indicates if persistent storage is required.

list - The modification list to use for setting up parameters.

Throws: InstanceAlreadyExistException

The m-bean is already registered in the repository.

 public void deleteCmf()

Deletes the net class loader.

 public void loadLibrary(String baseName,
                         String libName) throws SecurityException, UnsatisfiedLinkError

Loads a dynamic native library.

Parameters:

basename - The basename argument is the unique library base name where the library is stored on the management server.

libname - The libname argument is either the full pathname of the library below the library base path or is a simple, architecture-independent library name where the path, prefix, and suffix for the library name are generated based on the appliance type on which the loadLibrary() call was made.

Throws: SecurityException

If the current thread cannot load the specified dynamic library.

Throws: UnsatisfiedLinkError

If the library does not exist.

 public Class loadClass(String name) throws ClassNotFoundException

Throws: ClassNotFoundException

The specified class could not be found.

Overrides:

loadClass in class ClassLoader

 public synchronized void performStart()

Activates the NetClassLoader.

 public synchronized void performStop()

Deactivates the NetClassLoader.

 public boolean isActive()

Tests if the NetClassLoader is active.

 public static String getClassVersion()

Returns the version of this class.

 public ObjectName getLoaderName()

Gets the object name of this instance of NetClassLoader.

Returns:

The object name of this instance of NetClassLoader.

 public Vector getLibPaths()

Returns the current libpath used by the loader for storing native libraries

 public void setLibPaths(Vector newValue) throws RemoteException

Set library path from where native libraries are loaded

Throws: RemoteException

See java.rmi.RemoteException.

 public void writeExternal(ObjectOutput out) throws IOException

This method saves the objects contents during Object Serialization.

Parameters:

out - The serialization output stream.

Throws: IOException

Signals that an I/O exception of some sort has occurred.

 public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException

This method reads the objects contents during Object Serialization.

Parameters:

in - The serialization input stream.

Throws: IOException

Signals that an I/O exception of some sort has occurred.

Throws: ClassNotFoundException

The class for an object being restored cannot be found.

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