Java Doc for MessageWriter.java in  » Science » Cougaar12_4 » org » cougaar » mts » base » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.mts.base 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


org.cougaar.mts.base.MessageWriter

All known Subclasses:   org.cougaar.mts.base.MessageWriterImpl,  org.cougaar.mts.base.MessageWriterDelegateImplBase,
MessageWriter
public interface MessageWriter (Code)
This is the final station in the sender for serializling LinkProyocols. MessageWriter and MessageReader allow aspect authors to examine and filter the serialized data stream.

Aspect implementers must either call the package-access addFilter AttribuedMessage method or use pushValue("Filter", className) to get the MessageWriter and MessageReader delegates to be attached. Each message has the aspect chain built for it and the target's aspect chain is governed by the list as given by the sender. Normally the attribute is added in the DestinationLink's forwardMessage or addAttributes method.

The previous stop is DestinationLink. The next stop is MessageReader on the receiving side.
See Also:   AttributedMessage.addFilter(Object)
See Also:   Attributes.pushValue(StringObject)
See Also:   SendLink
See Also:   SendQueue
See Also:   Router
See Also:   DestinationQueue
See Also:   DestinationLink
See Also:   MessageReader
See Also:   MessageDeliverer
See Also:   ReceiveLink
See Also:   Javadoc contributions by George Mount.





Method Summary
 voidfinalizeAttributes(AttributedMessage msg)
     Called during serialization to give the MessageWriter the opportunity to view and modify the message attributes.
 voidfinishOutput()
     Called during AttributedMessage serialization after the message body has been written to the OutputStream returned from getObjectOutputStream.
 OutputStreamgetObjectOutputStream(ObjectOutput out)
     Called by AttributedMessage during serialization.
 voidpostProcess()
     Called after all data is written to the output stream in finishOutput.
 voidpreProcess()
     Called by AttributedMessage during serialization before getObjectOutputStream and after finalizeAttributes.



Method Detail
finalizeAttributes
void finalizeAttributes(AttributedMessage msg)(Code)
Called during serialization to give the MessageWriter the opportunity to view and modify the message attributes.
Parameters:
  msg - The message for which this MessageWriter is designated.
See Also:   MessageWriter.preProcess()



finishOutput
void finishOutput() throws java.io.IOException(Code)
Called during AttributedMessage serialization after the message body has been written to the OutputStream returned from getObjectOutputStream.
throws:
  java.io.IOException - The stream could be cached so an IOException can be thrown here.
See Also:   MessageWriter.getObjectOutputStream(ObjectOutput)



getObjectOutputStream
OutputStream getObjectOutputStream(ObjectOutput out) throws java.io.IOException(Code)
Called by AttributedMessage during serialization. The stream is used to write the serialized message body. The returned OutputStream is usually a filtered stream that modifies the contents before writing them to out.
Parameters:
  out - The next innermost stream in the nesting. An OutputStream to be used for serialization of the message.
See Also:   MessageWriter.preProcess
See Also:   MessageWriter.finishOutput



postProcess
void postProcess()(Code)
Called after all data is written to the output stream in finishOutput.
See Also:   MessageWriter.finishOutput()



preProcess
void preProcess()(Code)
Called by AttributedMessage during serialization before getObjectOutputStream and after finalizeAttributes.
See Also:   MessageWriter.finalizeAttributes(AttributedMessage)
See Also:   MessageWriter.getObjectOutputStream(ObjectOutput)



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