Module jakarta.ejb

Package jakarta.ejb.spi

Interface HandleDelegate

public interface HandleDelegate

The HandleDelegate interface is implemented by the enterprise bean container. It is used by portable implementations of jakarta.ejb.Handle and jakarta.ejb.HomeHandle. It is not used by enterprise bean components or by client components. It provides methods to serialize and deserialize EJBObject and EJBHome references to streams.

The HandleDelegate object is obtained by JNDI lookup at the reserved name "java:comp/HandleDelegate".

Since:

EJB 2.0

Method Summary

Modifier and Type	Method	Description
EJBHome	readEJBHome(ObjectInputStream istream)	Deserialize the EJBHome reference corresponding to a HomeHandle.
EJBObject	readEJBObject(ObjectInputStream istream)	Deserialize the EJBObject reference corresponding to a Handle.
void	writeEJBHome(EJBHome ejbHome, ObjectOutputStream ostream)	Serialize the EJBHome reference corresponding to a HomeHandle.
void	writeEJBObject(EJBObject ejbObject, ObjectOutputStream ostream)	Serialize the EJBObject reference corresponding to a Handle.

Method Details

writeEJBObject

void writeEJBObject(EJBObject ejbObject,
 ObjectOutputStream ostream)
             throws IOException

Serialize the EJBObject reference corresponding to a Handle.

This method is called from the writeObject method of portable Handle implementation classes. The ostream object is the same object that was passed in to the Handle class's writeObject method.

Parameters:

ejbObject - The EJBObject reference to be serialized.

ostream - The output stream.

Throws:

IOException - The EJBObject could not be serialized because of a system-level failure.

readEJBObject

EJBObject readEJBObject(ObjectInputStream istream)
                 throws IOException,
ClassNotFoundException

Deserialize the EJBObject reference corresponding to a Handle.

The readEJBObject method is called from the readObject method of portable Handle implementation classes. The istream object is the same object that was passed in to the Handle class's readObject method. WhenreadEJBObject is called, istream must point to the location in the stream at which the EJBObject reference can be read. The container must ensure that the EJBObject reference is capable of performing invocations immediately after deserialization.

Parameters:

istream - The input stream.

Returns:

The deserialized EJBObject reference.

Throws:

IOException - The EJBObject could not be deserialized because of a system-level failure.

ClassNotFoundException - The EJBObject could not be deserialized because some class could not be found.

writeEJBHome

void writeEJBHome(EJBHome ejbHome,
 ObjectOutputStream ostream)
           throws IOException

Serialize the EJBHome reference corresponding to a HomeHandle.

This method is called from the writeObject method of portable HomeHandle implementation classes. The ostream object is the same object that was passed in to the Handle class's writeObject method.

Parameters:

ejbHome - The EJBHome reference to be serialized.

ostream - The output stream.

Throws:

IOException - The EJBObject could not be serialized because of a system-level failure.

readEJBHome

EJBHome readEJBHome(ObjectInputStream istream)
             throws IOException,
ClassNotFoundException

Deserialize the EJBHome reference corresponding to a HomeHandle.

The readEJBHome method is called from the readObject method of portable HomeHandle implementation classes. The istream object is the same object that was passed in to the HomeHandle class's readObject method. When readEJBHome is called, istream must point to the location in the stream at which the EJBHome reference can be read. The container must ensure that the EJBHome reference is capable of performing invocations immediately after deserialization.

Parameters:

istream - The input stream.

Returns:

The deserialized EJBHome reference.

Throws:

IOException - The EJBHome could not be deserialized because of a system-level failure.

ClassNotFoundException - The EJBHome could not be deserialized because some class could not be found.