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# Class w3c.jigsaw.http.socket.SocketClientFactory

    java.lang.Object
       |
       +----w3c.jigsaw.http.socket.SocketClientFactory

public class SocketClientFactory
extends Object
implements ClientFactory, PropertyMonitoring

The client pool is a kind of client factory. Each time the server gets a new connection, it calls the client pool to bound a client object (newly created or spared) to handle it.

##

AVG_DEAD
AVG_HIGH
AVG_LIGHT
AVG_NORMAL
IDLETO
IDLETO_P
MAXCLIENTS
MAXCLIENTS_P
MAXSPARE_FREE
MAXSPARE_FREE_P
MAXSPARE_IDLE
MAXSPARE_IDLE_P
MAXTHREADS
MAXTHREADS_P
MINSPARE_FREE
MINSPARE_FREE_P

##

SocketClientFactory()
  Empty constructor for dynamic class instantiation.

##

addClient(boolean)
  Create a new client for this pool.
clientConnectionFinished(SocketClient)
  Notify that this client has finished with its connection.
clientFinished(SocketClient)
  Notify that this client has been killed.
createServerSocket()
  Create the master socket for this client factory.
deleteClient(SocketClientState)
  Remove this client state from the glohbal client list.
handleConnection(Socket)
  Handle the given connection.
initialize(httpd)
  Initialize the raw, client socket factory.
killClients(boolean)
killSomeClients()
killSomeClients(int)
notifyIdle(SocketClient)
  The client notifies the pool that it enters idle state.
notifyUse(SocketClient)
  The client notifies the pool that is has been activated.
propertyChanged(String)
  Some property have changed, update our setting.
run(SocketClient)
shutdown(boolean)
  Shutdown the client pool.

##

MINSPARE_FREE

      public final static int MINSPARE_FREE

MAXSPARE_FREE

      public final static int MAXSPARE_FREE

MAXSPARE_IDLE

      public final static int MAXSPARE_IDLE

MAXTHREADS

      public final static int MAXTHREADS

MAXCLIENTS

      public final static int MAXCLIENTS

IDLETO

      public final static int IDLETO

AVG_LIGHT

      public final static int AVG_LIGHT

AVG_NORMAL

      public final static int AVG_NORMAL

AVG_HIGH

      public final static int AVG_HIGH

AVG_DEAD

      public final static int AVG_DEAD

MINSPARE_FREE_P

      public final static String MINSPARE_FREE_P

MAXSPARE_FREE_P

      public final static String MAXSPARE_FREE_P

MAXSPARE_IDLE_P

      public final static String MAXSPARE_IDLE_P

MAXTHREADS_P

      public final static String MAXTHREADS_P

MAXCLIENTS_P

      public final static String MAXCLIENTS_P

IDLETO_P

      public final static String IDLETO_P

##

SocketClientFactory

      public SocketClientFactory()

  Empty constructor for dynamic class instantiation.

##

propertyChanged

      public boolean propertyChanged(String name)

  Some property have changed, update our setting.
  Parameters:
    name - The name of the property that has changed.
  Returns:
    A boolean, true if we updated ourself successfully.

deleteClient

      protected synchronized void deleteClient(SocketClientState cs)

  Remove this client state from the glohbal client list.
  Parameters:
    cs - The client state to remove from the list.

addClient

      protected synchronized SocketClientState addClient(boolean free)

  Create a new client for this pool.
  Parameters:
    free - A boolean, if true the client is inserted straight into the free list, otherwise, it is not plugged into any list.
  Returns:
    A SocketClientState instance, if creation of a new client was allowed, null if no more clients could be created.

clientConnectionFinished

      protected boolean clientConnectionFinished(SocketClient client)

  Notify that this client has finished with its connection. If the pool wants the client to be freed (because it has too many of them), it makes the client kill itself (which will trigger a call to the clientFinished method, were enventual cleanup is performed).
  Parameters:
    client - The client that is done with its connection.

clientFinished

      protected void clientFinished(SocketClient client)

  Notify that this client has been killed.
  Parameters:
    client - The client that has terminate.

notifyUse

      protected void notifyUse(SocketClient client)

  The client notifies the pool that is has been activated. The client state object is updated to unmark the client as idle.

  This method needs not be synchronized, as it affect only the client state, not the client list.

  Parameters:
    client - The activated client.

notifyIdle

      protected boolean notifyIdle(SocketClient client)

  The client notifies the pool that it enters idle state.

  This method needs not be synchronized, as it affect only the client state, not the client list.

  Parameters:
    client - The client that is going to be idle.

killSomeClients

      protected void killSomeClients(int howmany)

killSomeClients

      protected final void killSomeClients()

run

      protected void run(SocketClient client)

handleConnection

      public void handleConnection(Socket socket)

  Handle the given connection. Find a free client, bind it to the given socket, and run it. If we have reached our maximum allowed number of clients, kill some connections.

  A client enters the LRU list (and become a candidate for kill) only after it has handle one request (or if some timeout expires). This is performed by the first call to `notifyUse` which will silently insert the client into the LRU if it was not there already.

  This client pool does a lot of nice thinigs, but could probably be implemented in a much better way (while keeping the features it has). Contention arond the pool is probably concern number 1 of performances.

  Parameters:
    socket - The connection to handle.

killClients

      protected synchronized void killClients(boolean force)

shutdown

      public void shutdown(boolean force)

  Shutdown the client pool. If force is true, kill all running clients right now, otherwise, wait for them to terminate gracefully, and return when done.
  Parameters:
    force - Should we interrupt running clients.

createServerSocket

      public ServerSocket createServerSocket() throws IOException

  Create the master socket for this client factory.
  Returns:
    A ServerSocket instance.
  Throws: IOException
    If some IO error occurs while creating the server socket.

initialize

      public void initialize(httpd server)

  Initialize the raw, client socket factory.
  Parameters:
    server - The server context we are attached to.

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