/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.hadoop.hbase.ipc;

import java.io.IOException;
import java.net.InetSocketAddress;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.CellScanner;
import org.apache.hadoop.hbase.monitoring.MonitoredRPCHandler;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.security.authorize.PolicyProvider;

import com.google.common.annotations.VisibleForTesting;
import com.google.protobuf.BlockingService;
import com.google.protobuf.Descriptors.MethodDescriptor;
import com.google.protobuf.Message;
import com.google.protobuf.ServiceException;

/**
 * RpcServer Interface.
 * Start calls {@link #openServer()} and then {@link #startThreads()}.  Prefer {@link #start()}
 * and {@link #stop()}.  Only use {@link #openServer()} and {@link #startThreads()} if in a
 * situation where you could start getting requests though the server not up and fully
 * initiaalized.
 */
@InterfaceAudience.Private
public interface RpcServerInterface {
  void start();
  void openServer();
  void startThreads();
  boolean isStarted();

  void stop();
  void join() throws InterruptedException;

  void setSocketSendBufSize(int size);
  InetSocketAddress getListenerAddress();

  Pair<Message, CellScanner> call(BlockingService service, MethodDescriptor md,
    Message param, CellScanner cellScanner, long receiveTime, MonitoredRPCHandler status)
  throws IOException, ServiceException;

  void setErrorHandler(HBaseRPCErrorHandler handler);
  HBaseRPCErrorHandler getErrorHandler();

  /**
   * Returns the metrics instance for reporting RPC call statistics
   */
  MetricsHBaseServer getMetrics();

  /**
   * Add/subtract from the current size of all outstanding calls.  Called on setup of a call to add
   * call total size and then again at end of a call to remove the call size.
   * @param diff Change (plus or minus)
   */
  void addCallSize(long diff);

  /**
   * Refresh authentication manager policy.
   * @param pp
   */
  @VisibleForTesting
  void refreshAuthManager(PolicyProvider pp);
}