/**
    * 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.master.procedure;
  
  import java.io.IOException;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.classification.InterfaceStability;
  import org.apache.hadoop.hbase.ipc.RpcServer;
  import org.apache.hadoop.hbase.master.HMaster;
  import org.apache.hadoop.hbase.master.MasterCoprocessorHost;
  import org.apache.hadoop.hbase.master.MasterServices;
  import org.apache.hadoop.hbase.master.procedure.MasterProcedureScheduler.ProcedureEvent;
  import org.apache.hadoop.hbase.procedure2.Procedure;
  import org.apache.hadoop.hbase.procedure2.store.ProcedureStore;
  import org.apache.hadoop.hbase.procedure2.store.wal.WALProcedureStore;
  import org.apache.hadoop.hbase.security.User;
  import org.apache.hadoop.hbase.security.Superusers;
  import org.apache.hadoop.hbase.util.CancelableProgressable;
  import org.apache.hadoop.hbase.util.FSUtils;
  
  @InterfaceAudience.Private
  @InterfaceStability.Evolving
  public class MasterProcedureEnv {
    private static final Log LOG = LogFactory.getLog(MasterProcedureEnv.class);
  
    @InterfaceAudience.Private
    public static class WALStoreLeaseRecovery implements WALProcedureStore.LeaseRecovery {
      private final HMaster master;
  
      public WALStoreLeaseRecovery(final HMaster master) {
        this.master = master;
      }
  
      @Override
      public void recoverFileLease(final FileSystem fs, final Path path) throws IOException {
        final Configuration conf = master.getConfiguration();
        final FSUtils fsUtils = FSUtils.getInstance(fs, conf);
        fsUtils.recoverFileLease(fs, path, conf, new CancelableProgressable() {
          @Override
          public boolean progress() {
            LOG.debug("Recover Procedure Store log lease: " + path);
            return master.isActiveMaster();
          }
        });
      }
    }
  
    @InterfaceAudience.Private
    public static class MasterProcedureStoreListener
        implements ProcedureStore.ProcedureStoreListener {
      private final HMaster master;
  
      public MasterProcedureStoreListener(final HMaster master) {
        this.master = master;
      }
  
      @Override
      public void postSync() {
        // no-op
      }
  
      @Override
      public void abortProcess() {
        master.abort("The Procedure Store lost the lease");
      }
    }
  
    private final MasterProcedureScheduler procSched;
    private final MasterServices master;
  
    public MasterProcedureEnv(final MasterServices master) {
      this.master = master;
      this.procSched = new MasterProcedureScheduler(master.getConfiguration(),
        master.getTableLockManager());
    }
  
    public User getRequestUser() {
     User user = RpcServer.getRequestUser();
     if (user == null) {
       user = Superusers.getSystemUser();
     }
     return user;
   }
 
   public MasterServices getMasterServices() {
     return master;
   }
 
   public Configuration getMasterConfiguration() {
     return master.getConfiguration();
   }
 
   public MasterCoprocessorHost getMasterCoprocessorHost() {
     return master.getMasterCoprocessorHost();
   }
 
   public MasterProcedureScheduler getProcedureQueue() {
     return procSched;
   }
 
   public boolean isRunning() {
     return master.getMasterProcedureExecutor().isRunning();
   }
 
   public boolean isInitialized() {
     return master.isInitialized();
   }
 
   public boolean waitInitialized(Procedure proc) {
     return procSched.waitEvent(((HMaster)master).getInitializedEvent(), proc);
   }
 
   public boolean waitServerCrashProcessingEnabled(Procedure proc) {
     return procSched.waitEvent(((HMaster)master).getServerCrashProcessingEnabledEvent(), proc);
   }
 
   public void wake(ProcedureEvent event) {
     procSched.wake(event);
   }
 
   public void suspend(ProcedureEvent event) {
     procSched.suspend(event);
   }
 
   public void setEventReady(ProcedureEvent event, boolean isReady) {
     if (isReady) {
       procSched.wake(event);
     } else {
       procSched.suspend(event);
     }
   }
 }