/**
    *
    * 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;
  
  public class MetricsHBaseServerWrapperImpl implements MetricsHBaseServerWrapper {
  
    private RpcServer server;
  
    MetricsHBaseServerWrapperImpl(RpcServer server) {
      this.server = server;
    }
  
    private boolean isServerStarted() {
      return this.server != null && this.server.isStarted();
    }
  
    @Override
    public long getTotalQueueSize() {
      if (!isServerStarted()) {
        return 0;
      }
      return server.callQueueSize.get();
    }
  
    @Override
    public int getGeneralQueueLength() {
      if (!isServerStarted() || this.server.getScheduler() == null) {
        return 0;
      }
      return server.getScheduler().getGeneralQueueLength();
    }
  
    @Override
    public int getReplicationQueueLength() {
      if (!isServerStarted() || this.server.getScheduler() == null) {
        return 0;
      }
      return server.getScheduler().getReplicationQueueLength();
    }
  
    @Override
    public int getPriorityQueueLength() {
      if (!isServerStarted() || this.server.getScheduler() == null) {
        return 0;
      }
      return server.getScheduler().getPriorityQueueLength();
    }
  
    @Override
    public int getNumOpenConnections() {
      if (!isServerStarted()) {
        return 0;
      }
      return server.numConnections;
    }
  
    @Override
    public int getActiveRpcHandlerCount() {
      if (!isServerStarted() || this.server.getScheduler() == null) {
        return 0;
      }
      return server.getScheduler().getActiveRpcHandlerCount();
    }
  
    @Override
    public int getActiveGeneralRpcHandlerCount() {
      if (!isServerStarted() || this.server.getScheduler() == null) {
        return 0;
      }
      return server.getScheduler().getActiveGeneralRpcHandlerCount();
    }
  
    @Override
    public int getActivePriorityRpcHandlerCount() {
      if (!isServerStarted() || this.server.getScheduler() == null) {
        return 0;
      }
      return server.getScheduler().getActivePriorityRpcHandlerCount();
    }
  
    @Override
    public int getActiveReplicationRpcHandlerCount() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getActiveReplicationRpcHandlerCount();
   }
 
   @Override
   public long getNumGeneralCallsDropped() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getNumGeneralCallsDropped();
   }
 
   @Override
   public long getNumLifoModeSwitches() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getNumLifoModeSwitches();
   }
 
   @Override
   public int getWriteQueueLength() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getWriteQueueLength();
   }
 
   @Override
   public int getReadQueueLength() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getReadQueueLength();
   }
 
   @Override
   public int getScanQueueLength() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getScanQueueLength();
   }
 
   @Override
   public int getActiveWriteRpcHandlerCount() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getActiveWriteRpcHandlerCount();
   }
 
   @Override
   public int getActiveReadRpcHandlerCount() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getActiveReadRpcHandlerCount();
   }
 
   @Override
   public int getActiveScanRpcHandlerCount() {
     if (!isServerStarted() || this.server.getScheduler() == null) {
       return 0;
     }
     return server.getScheduler().getActiveScanRpcHandlerCount();
   }
 }