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/*
 * Copyright 2014 The gRPC Authors
 *
 * 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 io.grpc;

/**
 * Definition of a method exposed by a {@link Server}.
 *
 * @see ServerServiceDefinition
 */
public final class ServerMethodDefinition {
  private final MethodDescriptor method;
  private final ServerCallHandler handler;

  private ServerMethodDefinition(MethodDescriptor method,
      ServerCallHandler handler) {
    this.method = method;
    this.handler = handler;
  }

  /**
   * Create a new instance.
   *
   * @param method the {@link MethodDescriptor} for this method.
   * @param handler to dispatch calls to.
   * @return a new instance.
   */
  public static  ServerMethodDefinition create(
      MethodDescriptor method,
      ServerCallHandler handler) {
    return new ServerMethodDefinition<>(method, handler);
  }

  /** The {@code MethodDescriptor} for this method. */
  public MethodDescriptor getMethodDescriptor() {
    return method;
  }

  /** Handler for incoming calls. */
  public ServerCallHandler getServerCallHandler() {
    return handler;
  }

  /**
   * Create a new method definition with a different call handler.
   *
   * @param handler to bind to a cloned instance of this.
   * @return a cloned instance of this with the new handler bound.
   */
  public ServerMethodDefinition withServerCallHandler(
      ServerCallHandler handler) {
    return new ServerMethodDefinition<>(method, handler);
  }
}