Package org.apache.mina.filter.codec

Class ProtocolCodecFilter

java.lang.Object

org.apache.mina.core.filterchain.IoFilterAdapter

org.apache.mina.filter.codec.ProtocolCodecFilter

All Implemented Interfaces:

IoFilter

Direct Known Subclasses:

HttpClientCodec, HttpServerCodec

public class ProtocolCodecFilter
extends IoFilterAdapter

An IoFilter which translates binary or protocol specific data into message objects and vice versa using ProtocolCodecFactory, ProtocolEncoder, or ProtocolDecoder.

Author:

Apache MINA Project

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.mina.core.filterchain.IoFilter

IoFilter.NextFilter

Constructor Summary

Constructors

Constructor	Description
ProtocolCodecFilter(Class<? extends ProtocolEncoder> encoderClass, Class<? extends ProtocolDecoder> decoderClass)	Creates a new instance of ProtocolCodecFilter, without any factory.
ProtocolCodecFilter(ProtocolCodecFactory factory)	Creates a new instance of ProtocolCodecFilter, associating a factory for the creation of the encoder and decoder.
ProtocolCodecFilter(ProtocolEncoder encoder, ProtocolDecoder decoder)	Creates a new instance of ProtocolCodecFilter, without any factory.

Method Summary

Modifier and Type	Method	Description
void	filterWrite(IoFilter.NextFilter nextFilter, IoSession session, WriteRequest writeRequest)	Filters IoSession.write(Object) method invocation.
ProtocolEncoder	getEncoder(IoSession session)	Get the encoder instance from a given session.
void	messageReceived(IoFilter.NextFilter nextFilter, IoSession session, Object message)	Process the incoming message, calling the session decoder.
void	messageSent(IoFilter.NextFilter nextFilter, IoSession session, WriteRequest writeRequest)	Filters IoHandler.messageSent(IoSession,Object) event.
void	onPostRemove(IoFilterChain parent, String name, IoFilter.NextFilter nextFilter)	Invoked after this filter is removed from the specified parent.
void	onPreAdd(IoFilterChain parent, String name, IoFilter.NextFilter nextFilter)	Invoked before this filter is added to the specified parent.
void	sessionClosed(IoFilter.NextFilter nextFilter, IoSession session)	Filters IoHandler.sessionClosed(IoSession) event.

Methods inherited from class org.apache.mina.core.filterchain.IoFilterAdapter

destroy, event, exceptionCaught, filterClose, init, inputClosed, onPostAdd, onPreRemove, sessionCreated, sessionIdle, sessionOpened, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

ProtocolCodecFilter

public ProtocolCodecFilter(ProtocolCodecFactory factory)

Creates a new instance of ProtocolCodecFilter, associating a factory for the creation of the encoder and decoder.

Parameters:

factory - The associated factory

ProtocolCodecFilter

public ProtocolCodecFilter(ProtocolEncoder encoder,
                           ProtocolDecoder decoder)

Creates a new instance of ProtocolCodecFilter, without any factory. The encoder/decoder factory will be created as an inner class, using the two parameters (encoder and decoder).

Parameters:

encoder - The class responsible for encoding the message

decoder - The class responsible for decoding the message

ProtocolCodecFilter

public ProtocolCodecFilter(Class<? extends ProtocolEncoder> encoderClass,
                           Class<? extends ProtocolDecoder> decoderClass)

Creates a new instance of ProtocolCodecFilter, without any factory. The encoder/decoder factory will be created as an inner class, using the two parameters (encoder and decoder), which are class names. Instances for those classes will be created in this constructor.

Parameters:

encoderClass - The class responsible for encoding the message

decoderClass - The class responsible for decoding the message

Method Detail

getEncoder

public ProtocolEncoder getEncoder(IoSession session)

Get the encoder instance from a given session.

Parameters:

session - The associated session we will get the encoder from

Returns:

The encoder instance, if any

onPreAdd

public void onPreAdd(IoFilterChain parent,
                     String name,
                     IoFilter.NextFilter nextFilter)
              throws Exception

Invoked before this filter is added to the specified parent. Please note that this method can be invoked more than once if this filter is added to more than one parents. This method is not invoked before IoFilter.init() is invoked.

Specified by:

onPreAdd in interface IoFilter

Overrides:

onPreAdd in class IoFilterAdapter

Parameters:

parent - the parent who called this method

name - the name assigned to this filter

nextFilter - the IoFilter.NextFilter for this filter. You can reuse this object until this filter is removed from the chain.

Throws:

Exception - If an error occurred while processing the event

onPostRemove

public void onPostRemove(IoFilterChain parent,
                         String name,
                         IoFilter.NextFilter nextFilter)
                  throws Exception

Invoked after this filter is removed from the specified parent. Please note that this method can be invoked more than once if this filter is removed from more than one parents. This method is always invoked before IoFilter.destroy() is invoked.

Specified by:

onPostRemove in interface IoFilter

Overrides:

onPostRemove in class IoFilterAdapter

Parameters:

parent - the parent who called this method

name - the name assigned to this filter

nextFilter - the IoFilter.NextFilter for this filter. You can reuse this object until this filter is removed from the chain.

Throws:

Exception - If an error occurred while processing the event

messageReceived

public void messageReceived(IoFilter.NextFilter nextFilter,
                            IoSession session,
                            Object message)
                     throws Exception

Process the incoming message, calling the session decoder. As the incoming buffer might contains more than one messages, we have to loop until the decoder throws an exception. while ( buffer not empty ) try decode ( buffer ) catch break;

Specified by:

messageReceived in interface IoFilter

Overrides:

messageReceived in class IoFilterAdapter

Parameters:

nextFilter - the IoFilter.NextFilter for this filter. You can reuse this object until this filter is removed from the chain.

session - The IoSession which has received this event

message - The received message

Throws:

Exception - If an error occurred while processing the event

messageSent

public void messageSent(IoFilter.NextFilter nextFilter,
                        IoSession session,
                        WriteRequest writeRequest)
                 throws Exception

Filters IoHandler.messageSent(IoSession,Object) event.

Specified by:

messageSent in interface IoFilter

Overrides:

messageSent in class IoFilterAdapter

Parameters:

nextFilter - the IoFilter.NextFilter for this filter. You can reuse this object until this filter is removed from the chain.

session - The IoSession which has received this event

writeRequest - The WriteRequest that contains the sent message

Throws:

Exception - If an error occurred while processing the event

filterWrite

public void filterWrite(IoFilter.NextFilter nextFilter,
                        IoSession session,
                        WriteRequest writeRequest)
                 throws Exception

Filters IoSession.write(Object) method invocation.

Specified by:

filterWrite in interface IoFilter

Overrides:

filterWrite in class IoFilterAdapter

Parameters:

nextFilter - the IoFilter.NextFilter for this filter. You can reuse this object until this filter is removed from the chain.

session - The IoSession which has to process this invocation

writeRequest - The WriteRequest to process

Throws:

Exception - If an error occurred while processing the event

sessionClosed

public void sessionClosed(IoFilter.NextFilter nextFilter,
                          IoSession session)
                   throws Exception

Filters IoHandler.sessionClosed(IoSession) event.

Specified by:

sessionClosed in interface IoFilter

Overrides:

sessionClosed in class IoFilterAdapter

Parameters:

nextFilter - the IoFilter.NextFilter for this filter. You can reuse this object until this filter is removed from the chain.

session - The IoSession which has received this event

Throws:

Exception - If an error occurred while processing the event