public static InjectionCallbackArtifact ensureAsyncInjected(
TreeLogger logger,
String packageName,
String className,
String outputClass,
GeneratorContext ctx)
throws UnableToCompleteException {
GwtInjectionMap gwtInjectionMap = getInjectionMap(logger, ctx);
InjectionCallbackArtifact artifact =
gwtInjectionMap.getOrCreateArtifact(ctx, packageName, className);
if (artifact.isTargetUnbound()) {
artifact.bindTo(outputClass);
ensureProviderClass(
logger,
packageName,
artifact.getSimpleName(),
artifact.getCanonicalName(),
artifact.getBoundTarget(),
ctx);
logger =
logger.branch(
Type.TRACE,
"Creating asynchronous callback for "
+ artifact.getCanonicalName()
+ " -> "
+ outputClass);
String generatedName = InjectionUtils.generatedAsyncProviderName(artifact.getGeneratedName());
String implPackage = artifact.getImplementationPackage();
PrintWriter printWriter = ctx.tryCreate(logger, implPackage, generatedName);
if (printWriter == null) {
logger.log(
Type.WARN,
"Could not create the source writer for " + implPackage + "." + generatedName);
return artifact;
}
artifact.addCallback(implPackage + "." + generatedName + ".Deproxy");
ctx.commitArtifact(logger, artifact);
ClassSourceFileComposerFactory composer =
new ClassSourceFileComposerFactory(implPackage, generatedName);
composer.setPrivacy("public final");
composer.addImport(com.google.gwt.core.client.GWT.class.getName());
composer.addImport(RunAsyncCallback.class.getName());
composer.addImport(Fifo.class.getName());
composer.addImport(JsFifo.class.getName());
composer.addImport(AsyncProxy.class.getName());
composer.addImport(ApplyMethod.class.getName());
composer.addImport(ReceivesValue.class.getName());
composer.addImport(ReceiverAdapter.class.getCanonicalName());
composer.addImport(artifact.getCanonicalName());
String simpleName = artifact.getSimpleName();
SourceWriter sw = composer.createSourceWriter(ctx, printWriter);
sw.println();
sw.println("static final class Callbacks implements ApplyMethod{");
sw.indent();
sw.println("public void apply(Object ... args){");
sw.println("}");
sw.outdent();
sw.println("}");
sw.println();
sw.println("static final class Deproxy implements ReceivesValue<" + simpleName + ">{");
sw.indent();
sw.println("public final void set(final " + simpleName + " value){");
sw.indentln("getter = new ReceiverAdapter<" + simpleName + ">(value);");
sw.println("}");
sw.outdent();
sw.println("}");
sw.println();
sw.println(
"private static final class Proxy implements ReceivesValue<ReceivesValue<"
+ simpleName
+ ">>{");
sw.indent();
sw.println("public final void set(final ReceivesValue<" + simpleName + "> receiver){");
sw.indent();
sw.print("GWT.runAsync(");
sw.println(artifact.getCanonicalName() + ".class,new Request(receiver));");
sw.outdent();
sw.println("}");
sw.outdent();
sw.println("}");
sw.println();
sw.println("private static final class Request");
sw.indent();
sw.println("extends AsyncProxy<" + simpleName + "> ");
sw.println("implements RunAsyncCallback{");
DefermentWriter defer = new DefermentWriter(sw);
defer.setStrategy(DefermentStrategy.NONE);
sw.println("private static final Fifo<ReceivesValue<" + simpleName + ">> pending =");
sw.indentln("JsFifo.newFifo();");
sw.println();
sw.println("protected Request(ReceivesValue<" + simpleName + "> receiver){");
sw.indentln("accept(receiver);");
sw.println("}");
sw.println();
sw.println("@Override");
sw.println("protected final Fifo<ReceivesValue<" + simpleName + ">> pending(){");
sw.indentln("return pending;");
sw.println("}");
sw.println();
sw.println("protected final void dispatch(){");
sw.indentln("go();");
sw.println("}");
sw.println();
sw.println("public final void onSuccess(){");
sw.indent();
defer.printStart();
sw.println("final " + simpleName + " value = ");
sw.print(packageName + "." + InjectionUtils.generatedProviderName(simpleName));
sw.println(".theProvider.get();");
sw.println();
sw.print("final ApplyMethod callbacks = GWT.create(");
sw.print(packageName + ".impl." + generatedName + ".Callbacks.class");
sw.println(");");
sw.println("callbacks.apply(value);");
sw.println();
sw.println("apply(value);");
sw.outdent();
sw.println("}");
sw.outdent();
defer.printFinish();
sw.println("}");
sw.println();
sw.println(
"private static ReceivesValue<ReceivesValue<" + simpleName + ">> getter = new Proxy();");
sw.println();
sw.println("static void request(final ReceivesValue<" + simpleName + "> request){");
sw.indentln("getter.set(request);");
sw.println("}");
sw.println();
sw.println("static void go(){");
sw.indentln("request(null);");
sw.println("}");
sw.println();
sw.println("private " + generatedName + "(){}");
sw.commit(logger);
} else {
assert artifact.getBoundTarget().equals(outputClass)
: "The injection target "
+ artifact.getCanonicalName()
+ " was bound "
+ "to "
+ artifact.getBoundTarget()
+ ", but you tried to bind it again, "
+ "to a different class: "
+ outputClass;
}
return artifact;
}
