CLDC Generic Connection Framework framework

• Generalization of J2SE NW and I/O framework
• Can map to low level hardware/J2SE classes
• General Form

Connector.open(":

;");

• Static function
  

• No network protocols defined in CLDC
• Bulk of App code stays same for diff protocols
• Protocol Binding done at runtime.
• Implemented as a hierarchy of connection interfaces(7)
• One exception class: ConnectorNotFound
  

Classes and Interfaces

• Interface Connection- Basic Connection
  

public void close() throws IOException;

• Interface InputConnection- Device with data read capability
  

public InputStream openInputStream() throws IOException;
public DataInputStream openDataInputStream() throws IOException;

• Interface OutputConnection- Device with Data write capability

public OutputStream openOutputStream() throws IOException;
DataOutputStream openDataOutputStream() throws IOException;

• Interface StreamConnection-Combines InputConnection & OutputConnection
• Interface ContentConnection -Sub interface of StreamConnection-Access to HTTP metadata

public String getType();
public String getEncoding();
public long getLength();

• Interface StreamConnectionNotifier

public StreamConnection acceptAndOpen() throws IOException;

• Interface DatagramConnection -Datagram endpoint

public int getMaximumLength() IOException;
public int getNominalLength() IOException;

• Other functions for
  
• send,
  
• receive,
• 4 newDatagram(with params byte, size, address)
  

Datagram type

• has a data buffer associated with it.
  
• Use DataInput and DataOutput.
  
• Can behave like a stream