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Java example source code file (InternalServletModule.java)
The InternalServletModule.java Java example source code/** * Copyright (C) 2009 Google Inc. * * 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 com.google.inject.servlet; import static com.google.inject.servlet.ServletScopes.REQUEST; import static com.google.inject.servlet.ServletScopes.SESSION; import com.google.inject.AbstractModule; import com.google.inject.Inject; import com.google.inject.Key; import com.google.inject.Provider; import com.google.inject.Provides; import com.google.inject.Singleton; import java.util.Map; import java.util.logging.Logger; import javax.servlet.ServletContext; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; /** * This is a left-factoring of all ServletModules installed in the system. * In other words, this module contains the bindings common to all ServletModules, * and is bound exactly once per injector. * * @author dhanji@gmail.com (Dhanji R. Prasanna) */ final class InternalServletModule extends AbstractModule { /** * Special Provider that tries to obtain an injected servlet context, specific * to the current injector, failing which, it falls back to the static singleton * instance that is available in the legacy Guice Servlet. */ @Singleton static class BackwardsCompatibleServletContextProvider implements Provider<ServletContext> { private ServletContext injectedServletContext; @Inject BackwardsCompatibleServletContextProvider() {} // This setter is called by the GuiceServletContextListener void set(ServletContext injectedServletContext) { this.injectedServletContext = injectedServletContext; } public ServletContext get() { if (null != injectedServletContext) { return injectedServletContext; } Logger.getLogger(InternalServletModule.class.getName()) .warning("You are attempting to use a deprecated API (specifically," + " attempting to @Inject ServletContext inside an eagerly created" + " singleton. While we allow this for backwards compatibility, be" + " warned that this MAY have unexpected behavior if you have more" + " than one injector (with ServletModule) running in the same JVM." + " Please consult the Guice documentation at" + " https://github.com/google/guice/wiki/Servlets for more" + " information."); return GuiceFilter.getServletContext(); } } @Override protected void configure() { bindScope(RequestScoped.class, REQUEST); bindScope(SessionScoped.class, SESSION); bind(ServletRequest.class).to(HttpServletRequest.class); bind(ServletResponse.class).to(HttpServletResponse.class); // inject the pipeline into GuiceFilter so it can route requests correctly // Unfortunate staticness... =( // NOTE(dhanji): This is maintained for legacy purposes. requestStaticInjection(GuiceFilter.class); bind(ManagedFilterPipeline.class); bind(ManagedServletPipeline.class); bind(FilterPipeline.class).to(ManagedFilterPipeline.class).asEagerSingleton(); bind(ServletContext.class).toProvider(BackwardsCompatibleServletContextProvider.class); bind(BackwardsCompatibleServletContextProvider.class); } @Provides @Singleton @ScopingOnly GuiceFilter provideScopingOnlyGuiceFilter() { return new GuiceFilter(new DefaultFilterPipeline()); } @Provides @RequestScoped HttpServletRequest provideHttpServletRequest() { return GuiceFilter.getRequest(Key.get(HttpServletRequest.class)); } @Provides @RequestScoped HttpServletResponse provideHttpServletResponse() { return GuiceFilter.getResponse(Key.get(HttpServletResponse.class)); } @Provides HttpSession provideHttpSession() { return GuiceFilter.getRequest(Key.get(HttpSession.class)).getSession(); } @SuppressWarnings("unchecked") // defined by getParameterMap() @Provides @RequestScoped @RequestParameters Map<String, String[]> provideRequestParameters( ServletRequest req) { return req.getParameterMap(); } @Override public boolean equals(Object o) { // Is only ever installed internally, so we don't need to check state. return o instanceof InternalServletModule; } @Override public int hashCode() { return InternalServletModule.class.hashCode(); } } Other Java examples (source code examples)Here is a short list of links related to this Java InternalServletModule.java source code file: |
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