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package javax.ejb.spi;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import javax.ejb.EJBObject;
import javax.ejb.EJBHome;
/**
* The HandleDelegate interface is implemented by the EJB container.
* It is used by portable implementations of javax.ejb.Handle and
* javax.ejb.HomeHandle.
* It is not used by EJB 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
*/
public interface HandleDelegate {
/**
* 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.
*
* @param ejbObject The EJBObject reference to be serialized.
*
* @param ostream The output stream.
*
* @exception IOException The EJBObject could not be serialized
* because of a system-level failure.
*/
public void writeEJBObject(EJBObject ejbObject, ObjectOutputStream ostream)
throws IOException;
/**
* 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.
*
* @param istream The input stream.
*
* @return The deserialized EJBObject reference.
*
* @exception IOException The EJBObject could not be deserialized
* because of a system-level failure.
* @exception ClassNotFoundException The EJBObject could not be deserialized
* because some class could not be found.
*/
public javax.ejb.EJBObject readEJBObject(ObjectInputStream istream)
throws IOException, ClassNotFoundException;
/**
* 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.
*
* @param ejbHome The EJBHome reference to be serialized.
*
* @param ostream The output stream.
*
* @exception IOException The EJBObject could not be serialized
* because of a system-level failure.
*/
public void writeEJBHome(EJBHome ejbHome, ObjectOutputStream ostream)
throws IOException;
/**
* 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.
*
* @param istream The input stream.
*
* @return The deserialized EJBHome reference.
*
* @exception IOException The EJBHome could not be deserialized
* because of a system-level failure.
* @exception ClassNotFoundException The EJBHome could not be deserialized
* because some class could not be found.
*/
public javax.ejb.EJBHome readEJBHome(ObjectInputStream istream)
throws IOException, ClassNotFoundException;
}