AbstractPoolEntry.java 文件源码

/**
 * Layers a protocol on top of an established tunnel.
 *
 * @param context   the context for layering
 * @param params    the parameters for layering
 *
 * @throws IOException  in case of a problem
 */
public void layerProtocol(final HttpContext context, final HttpParams params)
    throws IOException {

    //@@@ is context allowed to be null? depends on operator?
    Args.notNull(params, "HTTP parameters");
    Asserts.notNull(this.tracker, "Route tracker");
    Asserts.check(this.tracker.isConnected(), "Connection not open");
    Asserts.check(this.tracker.isTunnelled(), "Protocol layering without a tunnel not supported");
    Asserts.check(!this.tracker.isLayered(), "Multiple protocol layering not supported");
    // - collect the arguments
    // - call the operator
    // - update the tracking data
    // In this order, we can be sure that only a successful
    // layering on top of the connection will be tracked.

    final HttpHost target = tracker.getTargetHost();

    connOperator.updateSecureConnection(this.connection, target,
                                         context, params);

    this.tracker.layerProtocol(this.connection.isSecure());

}