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## php.java.bridge.http
Class ContextServer

    java.lang.Object
      php.java.bridge.http.ContextServer

All Implemented Interfaces:
  ContextFactory.ICredentials

    public final class ContextServer

extends java.lang.Object
implements ContextFactory.ICredentials

A bridge pattern which either uses the PipeContextServer or the SocketContextServer, depending on the OS and/or the security restrictions. On windows, which cannot use named pipes, a SocketContextServer is used. All other operating systems use a PipeContextServer unless the system property php.java.bridge.promiscuous is set to true or the system property php.java.bridge.no_pipe_server is set to true.

A ContextServer instance represents the current web context. When the PipeContextServer is used, there can be more than one PipeContextServer instance per classloader, the ContextFactory.get() checks if it is called with the same ContextServer and throws a SecurityException otherwise. So one cannot access contexts belonging to other web contexts.

The SocketContextServer uses only one server socket for all shared web contexts and cannot do any security checks.

Author:
  jostb
See Also:
  `PipeContextServer`, `SocketContextServer`

Constructor Summary
`ContextServer(java.lang.String contextName)` Create a new ContextServer using a thread pool.

Method Summary
`void` | `destroy()` Destroy the pipe or socket context server.
`ContextFactory.ICredentials` | `getCredentials(java.lang.String channelName, java.lang.String kontext)` Return the credentials provided by the ContextServer.
`AbstractChannelName` | `getFallbackChannelName(java.lang.String channelName, java.lang.String kontext, IContextFactory currentCtx)` Return the channelName which be passed to the client as X_JAVABRIDGE_REDIRECT
`boolean` | `isAvailable(java.lang.String channelName)` Check if either the pipe of the socket context server is available.
`void` | `recycle(AbstractChannelName channelName)` Recycle a ContextRunner, if possible.
`ContextRunner` | `schedule(AbstractChannelName channelName)` Check for a ContextRunner for channelName
`void` | `start(AbstractChannelName channelName)` Start a channel name.

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### ContextServer

    public ContextServer(java.lang.String contextName)

  Create a new ContextServer using a thread pool.

  Parameters:
    `contextName` - The the name of the web context to which this server belongs.

Method Detail

### destroy

    public void destroy()

  Destroy the pipe or socket context server.

### isAvailable

    public boolean isAvailable(java.lang.String channelName)

  Check if either the pipe of the socket context server is available. This function may try start a SocketContextServer, if a PipeContextServer is not available.

  Parameters:
    `channelName` - The header value for X_JAVABRIDGE_CHANNEL, may be null.
  Returns:
    true if either the pipe or the socket context server is available.

### start

    public void start(AbstractChannelName channelName)

  Start a channel name.

  Parameters:
    `channelName` - The ChannelName.
  Throws:
    `java.lang.IllegalStateException` - if there's no Pipe- or SocketContextServer available

### schedule

    public ContextRunner schedule(AbstractChannelName channelName)

  Check for a ContextRunner for channelName

  Parameters:
    `channelName` - The ChannelName
  Returns:
    The ContextRunner or null.

### recycle

    public void recycle(AbstractChannelName channelName)

  Recycle a ContextRunner, if possible.

  Parameters:
    `channelName` - The ChannelName.

### getFallbackChannelName

    public AbstractChannelName getFallbackChannelName(java.lang.String channelName,
                                                      java.lang.String kontext,
                                                      IContextFactory currentCtx)

  Return the channelName which be passed to the client as X_JAVABRIDGE_REDIRECT

  Parameters:
    `channelName` - The name of the channel, see X_JAVABRIDGE_CHANNEL
    `kontext` - The name of the client's default ContextFactory, see X_JAVABRIDGE_CONTEXT_DEFAULT
    `currentCtx` - The current ContextFactory, see X_JAVABRIDGE_CONTEXT
  Returns:
    The channel name of the Pipe- or SocketContextServer.

### getCredentials

    public ContextFactory.ICredentials getCredentials(java.lang.String channelName,
                                                      java.lang.String kontext)

  Return the credentials provided by the ContextServer. The SocketContextServer is insecure and cannot provide any, because there's only one SocketContextServer instance for all shared web contexts. The PipeContextServer returns a token which will be used in ContextFactory.get() to check if the web context is allowed to access this contextFactory instance or not.

  Parameters:
    `channelName` - The name of the channel, see X_JAVABRIDGE_CHANNEL
    `kontext` - The name of the client's default ContextFactory, see X_JAVABRIDGE_CONTEXT_DEFAULT
  Returns:
    A security token.

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