Package org.apache.tomcat.websocket.server

Class WsFilter

java.lang.Object
org.apache.tomcat.websocket.server.WsFilter
All Implemented Interfaces:
Filter
public class WsFilter extends Object implements Filter
Handles the initial HTTP connection for WebSocket connections.

  • Constructor Summary

    Constructors
    Constructor
    Description
    WsFilter()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    destroy()
    Called by the web container to indicate to a filter that it is being taken out of service.
    void
    doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
    The doFilter method of the Filter is called by the container each time a request/response pair is passed through the chain due to a client request for a resource at the end of the chain.
    void
    init(FilterConfig filterConfig)
    Called by the web container to indicate to a filter that it is being placed into service.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • WsFilter

      public WsFilter()

  • Method Details

    • init

      public void init(FilterConfig filterConfig) throws ServletException
      Description copied from interface: javax.servlet.Filter
      Called by the web container to indicate to a filter that it is being placed into service. The servlet container calls the init method exactly once after instantiating the filter. The init method must complete successfully before the filter is asked to do any filtering work.

      The web container cannot place the filter into service if the init method either:

      • Throws a ServletException
      • Does not return within a time period defined by the web container
      Specified by:
      init in interface Filter
      Parameters:
      filterConfig - The configuration information associated with the filter instance being initialised
      Throws:
      ServletException - if the initialisation fails

    • doFilter

      public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
      Description copied from interface: javax.servlet.Filter
      The doFilter method of the Filter is called by the container each time a request/response pair is passed through the chain due to a client request for a resource at the end of the chain. The FilterChain passed in to this method allows the Filter to pass on the request and response to the next entity in the chain.

      A typical implementation of this method would follow the following pattern:-
      1. Examine the request
      2. Optionally wrap the request object with a custom implementation to filter content or headers for input filtering
      3. Optionally wrap the response object with a custom implementation to filter content or headers for output filtering
      4. a) Either invoke the next entity in the chain using the FilterChain object (chain.doFilter()),
      4. b) or not pass on the request/response pair to the next entity in the filter chain to block the request processing
      5. Directly set headers on the response after invocation of the next entity in the filter chain.

      Specified by:
      doFilter in interface Filter
      Parameters:
      request - The request to process
      response - The response associated with the request
      chain - Provides access to the next filter in the chain for this filter to pass the request and response to for further processing
      Throws:
      IOException - if an I/O error occurs during this filter's processing of the request
      ServletException - if the processing fails for any other reason

    • destroy

      public void destroy()
      Description copied from interface: javax.servlet.Filter
      Called by the web container to indicate to a filter that it is being taken out of service. This method is only called once all threads within the filter's doFilter method have exited or after a timeout period has passed. After the web container calls this method, it will not call the doFilter method again on this instance of the filter.

      This method gives the filter an opportunity to clean up any resources that are being held (for example, memory, file handles, threads) and make sure that any persistent state is synchronized with the filter's current state in memory.
      Specified by:
      destroy in interface Filter