MasterProcedureEnv.java example

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hbase-master
/**
 * 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.conf.ConfigurationObserver;
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.procedure2.Procedure;
import org.apache.hadoop.hbase.procedure2.ProcedureEvent;
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 implements ConfigurationObserver {
  private static final Log LOG = LogFactory.getLog(MasterProcedureEnv.class);

  @InterfaceAudience.Private
  public static class WALStoreLeaseRecovery implements WALProcedureStore.LeaseRecovery {
    private final MasterServices master;

    public WALStoreLeaseRecovery(final MasterServices 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 isRunning();
        }
      });
    }

    private boolean isRunning() {
      return master.isActiveMaster() && !master.isStopped() &&
        !master.isStopping() && !master.isAborted();
    }
  }

  @InterfaceAudience.Private
  public static class MasterProcedureStoreListener
      implements ProcedureStore.ProcedureStoreListener {
    private final MasterServices master;

    public MasterProcedureStoreListener(final MasterServices master) {
      this.master = master;
    }

    @Override
    public void postSync() {
      // no-op
    }

    @Override
    public void abortProcess() {
      master.abort("The Procedure Store lost the lease", null);
    }
  }

  private final MasterProcedureScheduler procSched;
  private final MasterServices master;

  public MasterProcedureEnv(final MasterServices master) {
    this.master = master;
    this.procSched = new MasterProcedureScheduler(master.getConfiguration());
  }

  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 getProcedureScheduler() {
    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 setEventReady(ProcedureEvent event, boolean isReady) {
    if (isReady) {
      procSched.wakeEvent(event);
    } else {
      procSched.suspendEvent(event);
    }
  }

  @Override
  public void onConfigurationChange(Configuration conf) {
    master.getMasterProcedureExecutor().refreshConfiguration(conf);
  }
}