Java tutorial
/* * Copyright 2012, We The Internet Ltd. * * All rights reserved. * * Distributed under a modified BSD License as follow: * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution, unless otherwise * agreed to in a written document signed by a director of We The Internet Ltd. * * Neither the name of We The Internet nor the names of its contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ package xapi.dev.generators; import java.io.PrintWriter; import xapi.collect.api.Fifo; import xapi.dev.util.DefermentWriter; import xapi.dev.util.InjectionCallbackArtifact; import xapi.gwt.collect.JsFifo; import xapi.util.api.ApplyMethod; import xapi.util.api.ProvidesValue; import xapi.util.api.ReceivesValue; import com.google.gwt.core.client.Scheduler; import com.google.gwt.core.client.Scheduler.ScheduledCommand; import com.google.gwt.core.ext.GeneratorContext; import com.google.gwt.core.ext.RebindMode; import com.google.gwt.core.ext.RebindResult; import com.google.gwt.core.ext.TreeLogger; import com.google.gwt.core.ext.TreeLogger.Type; import com.google.gwt.core.ext.UnableToCompleteException; import com.google.gwt.core.shared.GWT; import com.google.gwt.user.client.Timer; import com.google.gwt.user.rebind.ClassSourceFileComposerFactory; import com.google.gwt.user.rebind.SourceWriter; public class RunAsyncInjectionGenerator extends AbstractInjectionGenerator { @Override public RebindResult generateIncrementally(TreeLogger logger, GeneratorContext context, String typeName) throws UnableToCompleteException { Iterable<InjectionCallbackArtifact> artifacts = getInjectionMap(logger, context).getArtifacts(); // ctx.getArtifacts().find(InjectionCallbackArtifact.class); if (typeName.endsWith(".Callbacks")) { typeName = typeName.substring(0, typeName.length() - 10); logger.log(Type.INFO, "" + typeName); for (InjectionCallbackArtifact artifact : artifacts) { if (artifact.getAsyncInjectionName().equals(typeName)) { //we have our injectable artifact! int packageIndex = typeName.lastIndexOf('.'); String packageName = typeName.substring(0, packageIndex); String generatedName = "RunAsync" + typeName.substring(packageIndex + 12); typeName = packageName + "." + generatedName; logger.log(Type.INFO, "WIN " + typeName + " <- " + artifact); PrintWriter printWriter = context.tryCreate(logger, packageName, generatedName); if (printWriter == null) { logger.log(Type.TRACE, "Re-Using existing " + typeName); return new RebindResult(RebindMode.USE_EXISTING, typeName); } ClassSourceFileComposerFactory composer = new ClassSourceFileComposerFactory(packageName, generatedName); composer.addImplementedInterface(ApplyMethod.class.getName()); composer.setPrivacy("public final"); composer.addImport(GWT.class.getName()); composer.addImport(ApplyMethod.class.getName()); composer.addImport(ProvidesValue.class.getName()); composer.addImport(ReceivesValue.class.getName()); composer.addImport(Runnable.class.getName()); composer.addImport(Fifo.class.getName()); composer.addImport(JsFifo.class.getName()); composer.addImport(Timer.class.getName()); composer.addImport(Scheduler.class.getName()); composer.addImport(ScheduledCommand.class.getCanonicalName()); SourceWriter sw = composer.createSourceWriter(printWriter); sw.println("private static final Fifo<Object> callbacks;"); sw.println("static{"); sw.indent(); sw.println("callbacks = JsFifo.newFifo();"); for (String callback : artifact.getCallbacks()) { sw.println("callbacks.give(GWT.create(" + callback + ".class));"); } sw.outdent(); sw.println("}"); sw.println("@SuppressWarnings({\"unchecked\", \"rawtypes\"})"); sw.println("public void apply(final Object ... args){"); DefermentWriter defer = new DefermentWriter(sw); defer.printStart();//used to optionally push callbacks into new execution block //for now, we are only sending the service object as parameter sw.println(" Object service = args[0], callback;"); sw.println(" while(!callbacks.isEmpty()){"); sw.indent(); sw.println(" callback = callbacks.take();"); sw.println(" if (callback instanceof ReceivesValue){"); sw.println(" ((ReceivesValue)callback).set(service);"); sw.println(" }"); sw.println(" else if (callback instanceof ApplyMethod){"); sw.println(" ((ApplyMethod)callback).apply(args);"); sw.println(" }"); sw.println(" else if (callback instanceof ProvidesValue){"); sw.println(" ((ProvidesValue<ReceivesValue>)callback).get().set(service);"); sw.println(" }"); sw.println(" else if (callback instanceof Runnable){"); sw.println(" ((Runnable)callback).run();"); sw.println(" }"); sw.println("}"); sw.outdent(); defer.printFinish(); sw.println("}"); // sw.println("}"); sw.commit(logger); context.commit(logger, printWriter); return new RebindResult(RebindMode.USE_ALL_NEW, typeName); } } } logger.log(Type.INFO, "No callback class found for " + typeName + "; returning untransformed."); return new RebindResult(RebindMode.USE_EXISTING, typeName); } }