com.google.gwt.inject.rebind.binding.RemoteServiceProxyBinding Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of gin Show documentation

GIN (GWT INjection) brings automatic dependency injection to Google Web Toolkit client-side code. GIN is built on top of Guice and uses (a subset of) Guice's binding language.

There is a newer version: 2.1.2

Show newest version

/*
 * Copyright 2008 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.gwt.inject.rebind.binding;

import com.google.gwt.inject.rebind.reflect.NoSourceNameException;
import com.google.gwt.inject.rebind.reflect.ReflectUtil;
import com.google.gwt.inject.rebind.util.GuiceUtil;
import com.google.gwt.inject.rebind.util.SourceWriteUtil;
import com.google.gwt.user.client.rpc.RemoteService;
import com.google.inject.TypeLiteral;

/**
 * A binding that calls {@code GWT.create()} for the non-"Async" version
 * of the requested type.
 */
public class RemoteServiceProxyBinding extends CallGwtDotCreateBinding {

  /**
   * Suffix that is appended to the name of a GWT-RPC service interface to build
   * the name of the asynchronous proxy interface.
   */
  private static final String ASYNC_SERVICE_PROXY_SUFFIX = "Async";

  public static boolean isRemoteServiceProxy(TypeLiteral type) {
    Class rawType = type.getRawType();
    return rawType.isInterface()
        && rawType.getName().endsWith(ASYNC_SERVICE_PROXY_SUFFIX)
        && hasSynchronousServiceInterface(type);
  }

  RemoteServiceProxyBinding(GuiceUtil guiceUtil, TypeLiteral type) {
    super(guiceUtil, type, Context.format("Implicit remote service proxy binding for %s", type));
  }

  @Override
  protected String getTypeNameToCreate() throws NoSourceNameException {
    if (!hasSynchronousServiceInterface(getType())) {
      throw new RuntimeException("Failed to load synchronous service for " + getTypeName());
    }

    return ReflectUtil.getSourceName(getSynchronousServiceClass(getType()));
  }

  @Override
  protected String getExpectedTypeName() throws NoSourceNameException {
    return super.getTypeNameToCreate();
  }

  private static boolean hasSynchronousServiceInterface(TypeLiteral type) {
    Class synchronousType = getSynchronousServiceClass(type);
    return synchronousType != null && RemoteService.class.isAssignableFrom(synchronousType);
  }

  private static Class getSynchronousServiceClass(TypeLiteral type) {
    String name = type.getRawType().getName();
    String serviceInterfaceName =
        name.substring(0, name.length() - ASYNC_SERVICE_PROXY_SUFFIX.length());
    try {
      return RemoteServiceProxyBinding.class.getClassLoader().loadClass(serviceInterfaceName);
    } catch (ClassNotFoundException e) {
      return null;
    }
  }
}