com.google.appengine.tools.development.ContainerUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of appengine-api-stubs

SDK for dev_appserver (local development) with some of the dependencies shaded (repackaged)

There is a newer version: 2.0.31

/*
 * Copyright 2021 Google 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
 *
 *     https://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.appengine.tools.development;

import com.google.appengine.tools.info.AppengineSdk;

/** helper to load a {@link ContainerService} instance */
public class ContainerUtils {

  /**
   * Load a {@link ContainerService} instance based on the implementation: Jetty9 or Jetty12.
   *
   * @return the deployed {@link ContainerService} instance.
   * @throws IllegalArgumentException if the container cannot be loaded.
   */
  public static ContainerService loadContainer() {
    ContainerService result;

    // Try to load the correct Jetty service.
      try {
      result =
          Class.forName(
                  AppengineSdk.getSdk().getJettyContainerService(),
                  true,
                  DevAppServerImpl.class.getClassLoader())
              .asSubclass(ContainerService.class)
              .getDeclaredConstructor()
              .newInstance();
      } catch (ReflectiveOperationException e) {
        throw new IllegalArgumentException("Cannot load any servlet container.", e);
      }
      return result;
  }

  /** Returns the server info string with the dev-appserver version. */
  public static String getServerInfo() {
    return "Google App Engine Development/dev";
  }

  // There are no instances of this class.
  private ContainerUtils() {}
}