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Class connection.ConnectionManager 

java.lang.Object
   |
   +----connection.ConnectionManager
public class ConnectionManager
extends Object
ConnectionManager is a class for delivering messages (reading, writing, and handling). It is composed of a MessageHandler, a MessageReader, and a MessageWriter.

Version:
0.30, 1998/04/01
Author:
FRED development team, Antti Viljamaa
See Also:
MessageHandler, MessageReader, MessageWriter

Variable Index

o exceptionObservers
The objetcs that are notified upon an exception during a read or a write.
o messageHandler
The handler for incoming messages.
o messagePrintingEnabled
Determies whether to print debug info to System.out.
o messageReader
The message reader.
o messageWriter
The message writer.

Constructor Index

o ConnectionManager(InputStream, OutputStream)
Constructs a connection manager and initilises it with a message reader attached to the given input stream and a message writer attached to the given output stream.
o ConnectionManager(InputStream, OutputStream, MessageHandler)
Constructs a connection manager and initilises it with a message reader attached to the given input stream, a message writer attached to the given output stream, and a message handler.

Method Index

o getExceptionObservers()
Returns the exception observers.
o getMessageHandler()
Returns the message handler.
o getMessageReader()
Returns the message reader.
o getMessageWriter()
Returns the message writer.
o isMessagePrintingEnabled()
Determines if message printing is enabled.
o notifyAllExceptionObservers(Exception)
Notifies all registered exception observers.
o receiveMessage()
Blocks for receiving a new message, and once it arrives, asks the handler to handle it.
o registerExceptionObserver(ExceptionObserver)
Registeres a new exception observer.
o sendMessage(Message)
Sends the given message.
o setMessageHandler(MessageHandler)
Sets the message handler.
o setMessagePrintingEnabled(boolean)
Sets the flag that determines if message printing is enabled.
o setMessageReader(MessageReader)
Sets the message reader.
o setMessageWriter(MessageWriter)
Sets the message writer.

Variables

o exceptionObservers 
 private Vector exceptionObservers
The objetcs that are notified upon an exception during a read or a write.

o messageReader 
 private MessageReader messageReader
The message reader.

o messageWriter 
 private MessageWriter messageWriter
The message writer.

o messageHandler 
 private MessageHandler messageHandler
The handler for incoming messages.

o messagePrintingEnabled 
 private boolean messagePrintingEnabled
Determies whether to print debug info to System.out.

Constructors

o ConnectionManager 
 public ConnectionManager(InputStream inputStream,
                          OutputStream outputStream)
Constructs a connection manager and initilises it with a message reader attached to the given input stream and a message writer attached to the given output stream. No message handler is created.

Parameters:
inputStream - The input stream that is connected to this connection manager.
outputStream - The output stream that is connected to this connection manager.
o ConnectionManager 
 public ConnectionManager(InputStream inputStream,
                          OutputStream outputStream,
                          MessageHandler messageHandler)
Constructs a connection manager and initilises it with a message reader attached to the given input stream, a message writer attached to the given output stream, and a message handler.

Parameters:
inputStream - The input stream that is connected to this connection manager.
outputStream - The output stream that is connected to this connection manager.
messageHandler - The root handler for messages.

Methods

o sendMessage 
 public void sendMessage(Message m)
Sends the given message. If an exception occurs during the receive, notifies all exception observers.

Parameters:
m - The message that is sent.
o receiveMessage 
 public boolean receiveMessage()
Blocks for receiving a new message, and once it arrives, asks the handler to handle it. If an exception occurs during the receive, notifies all exception observers.

Returns:
boolean if the message was handled, otherwise.
o getMessageHandler 
 public MessageHandler getMessageHandler()
Returns the message handler.

o getMessageReader 
 public MessageReader getMessageReader()
Returns the message reader.

o getMessageWriter 
 public MessageWriter getMessageWriter()
Returns the message writer.

o setMessageReader 
 public void setMessageReader(MessageReader mr)
Sets the message reader.

o setMessageWriter 
 public void setMessageWriter(MessageWriter mw)
Sets the message writer.

o setMessageHandler 
 public void setMessageHandler(MessageHandler mh)
Sets the message handler.

o registerExceptionObserver 
 public void registerExceptionObserver(ExceptionObserver observer)
Registeres a new exception observer. Exception observers are notified if an exception occurs when sending or receiving messages.

o notifyAllExceptionObservers 
 protected void notifyAllExceptionObservers(Exception exception)
Notifies all registered exception observers.

o getExceptionObservers 
 public Vector getExceptionObservers()
Returns the exception observers.

o isMessagePrintingEnabled 
 public boolean isMessagePrintingEnabled()
Determines if message printing is enabled.

o setMessagePrintingEnabled 
 public void setMessagePrintingEnabled(boolean flag)
Sets the flag that determines if message printing is enabled. 

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