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Lift Framework example source code file (Servlet30AsyncProvider.scala)
The Lift Framework Servlet30AsyncProvider.scala source code/* * Copyright 2010-2011 WorldWide Conferencing, LLC * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.liftweb package http package provider package servlet package containers import javax.servlet.http.HttpServletRequest import javax.servlet._ import net.liftweb.common._ import net.liftweb.http._ import net.liftweb.http.provider._ import net.liftweb.http.provider.servlet._ import net.liftweb.util._ import Helpers._ object Servlet30AsyncProvider extends AsyncProviderMeta { private lazy val (hasContinuations_?, cc, asyncClass, startAsync, getResponse, complete, isSupported) = { try { val cc = Class.forName("javax.servlet.ServletRequest") val asyncClass = Class.forName("javax.servlet.AsyncContext") val startAsync = cc.getMethod("startAsync") val getResponse = asyncClass.getMethod("getResponse") val complete = asyncClass.getMethod("complete") val isSupported = cc.getMethod("isAsyncSupported") (true, cc, asyncClass, startAsync, getResponse, complete, isSupported) } catch { case e => (false, null, null, null, null, null, null) } } def suspendResumeSupport_? : Boolean = { hasContinuations_? } /** * return a function that vends the ServletAsyncProvider */ def providerFunction: Box[HTTPRequest => ServletAsyncProvider] = Full(req => new Servlet30AsyncProvider(req)). filter(i => suspendResumeSupport_?) } /** * Servlet30AsyncProvider * * Implemented by using Servlet30 Continuation API * */ class Servlet30AsyncProvider(req: HTTPRequest) extends ServletAsyncProvider with Loggable { private var asyncCtx: Object = null import Servlet30AsyncProvider._ private lazy val servletReq = (req.asInstanceOf[HTTPRequestServlet]).req def suspendResumeSupport_? : Boolean = hasContinuations_? && isSupported.invoke(servletReq).asInstanceOf[Boolean] def resumeInfo: Option[(Req, LiftResponse)] = None def suspend(timeout: Long): RetryState.Value = { asyncCtx = startAsync.invoke(servletReq) logger.trace("Servlet 3.0 suspend") RetryState.SUSPENDED } def resume(what: (Req, LiftResponse)): Boolean = { logger.trace("Servlet 3.0 begin resume") val httpRes = getResponse.invoke(asyncCtx).asInstanceOf[javax.servlet.http.HttpServletResponse] val httpResponse = new HTTPResponseServlet(httpRes) val liftServlet = req.provider.liftServlet liftServlet.sendResponse(what._2, httpResponse, what._1) complete.invoke(asyncCtx) logger.trace("Servlet 3.0 resume") true } } Other Lift Framework examples (source code examples)Here is a short list of links related to this Lift Framework Servlet30AsyncProvider.scala source code file: |
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