org.apache.jk.common
Class ChannelJni

java.lang.Object
  org.apache.jk.core.JkHandler
      org.apache.jk.common.JniHandler
          org.apache.jk.common.ChannelJni

All Implemented Interfaces:

java.util.EventListener, JkChannel, javax.management.MBeanRegistration, javax.management.NotificationListener

public class ChannelJni

extends JniHandler

implements JkChannel

Pass messages using jni

Author:

Costin Manolache

Field Summary

Fields inherited from class org.apache.jk.common.JniHandler

apr, C2B_NOTE, JK_HANDLE_JNI_DISPATCH, JK_HANDLE_SHM_DISPATCH, jkHome, MB_NOTE, MSG_NOTE, nativeJkHandlerP

Fields inherited from class org.apache.jk.core.JkHandler

domain, ERROR, HANDLE_FLUSH, HANDLE_RECEIVE_PACKET, HANDLE_SEND_PACKET, HANDLE_THREAD_END, id, LAST, mserver, name, next, nextName, OK, oname, properties, wEnv

Constructor Summary

ChannelJni()

Method Summary

int	flush(Msg msg, MsgContext ep) Flush the data to the client.
java.lang.String	getChannelName() Return the identifying name of this Channel.
void	init() You must call initNative() inside the component init()
int	invoke(Msg msg, MsgContext ep) Receive a packet from the C side.
boolean	isSameAddress(MsgContext ep) Confirm that a shutdown request was recieved form us.
int	receive(Msg msg, MsgContext ep) Receives does nothing - send will put the response in the same buffer
void	registerRequest(Request req, MsgContext ep, int count) Register a new Request in the Request pool.
int	send(Msg msg, MsgContext ep) Send the packet.

Methods inherited from class org.apache.jk.common.JniHandler

appendString, createMsgContext, destroyJkComponent, getJkHome, initJkComponent, initNative, nativeDispatch, pause, recycleNative, resume, setJkHome, setNativeAttribute, setNativeEndpoint

Methods inherited from class org.apache.jk.core.JkHandler

addHandlerCallback, destroy, getDomain, getId, getName, getNext, getObjectName, getProperty, handleNotification, postDeregister, postRegister, preDeregister, preRegister, setId, setName, setNext, setNext, setProperty, setWorkerEnv

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jk.core.JkChannel

createMsgContext

Constructor Detail

ChannelJni

public ChannelJni()

Method Detail

init

public void init()
          throws java.io.IOException

Description copied from class: JniHandler

You must call initNative() inside the component init()

Overrides:

init in class JniHandler

Throws:

java.io.IOException

receive

public int receive(Msg msg,
                   MsgContext ep)
            throws java.io.IOException

Receives does nothing - send will put the response in the same buffer

Specified by:

receive in interface JkChannel

Parameters:

msg - The place to recieve the data into.

ep - The connection point for this request.

Throws:

java.io.IOException

send

public int send(Msg msg,
                MsgContext ep)
         throws java.io.IOException

Send the packet. XXX This will modify msg !!! We could use 2 packets, or sendAndReceive().

Specified by:

send in interface JkChannel

Parameters:

msg - The message to send.

ep - The connection point for this request.

Throws:

java.io.IOException

flush

public int flush(Msg msg,
                 MsgContext ep)
          throws java.io.IOException

Description copied from interface: JkChannel

Flush the data to the client.

Specified by:

flush in interface JkChannel

Throws:

java.io.IOException

isSameAddress

public boolean isSameAddress(MsgContext ep)

Description copied from interface: JkChannel

Confirm that a shutdown request was recieved form us.

Specified by:

isSameAddress in interface JkChannel

registerRequest

public void registerRequest(Request req,
                            MsgContext ep,
                            int count)

Description copied from interface: JkChannel

Register a new Request in the Request pool.

Specified by:

registerRequest in interface JkChannel

getChannelName

public java.lang.String getChannelName()

Description copied from interface: JkChannel

Return the identifying name of this Channel.

Specified by:

getChannelName in interface JkChannel

invoke

public int invoke(Msg msg,
                  MsgContext ep)
           throws java.io.IOException

Receive a packet from the C side. This is called from the C code using invocation, but only for the first packet - to avoid recursivity and thread problems. This may look strange, but seems the best solution for the problem ( the problem is that we don't have 'continuation' ). sendPacket will move the thread execution on the C side, and return when another packet is available. For packets that are one way it'll return after it is processed too ( having 2 threads is far more expensive ). Again, the goal is to be efficient and behave like all other Channels ( so the rest of the code can be shared ). Playing with java objects on C is extremely difficult to optimize and do right ( IMHO ), so we'll try to keep it simple - byte[] passing, the conversion done in java ( after we know the encoding and if anyone asks for it - same lazy behavior as in 3.3 ).

Specified by:

invoke in interface JkChannel

Overrides:

invoke in class JniHandler

Throws:

java.io.IOException