/*
    * 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.omid.tso;
  
  import org.apache.curator.framework.CuratorFramework;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class PausableLeaseManager extends LeaseManager {
  
      private static final Logger LOG = LoggerFactory.getLogger(PausableLeaseManager.class);
  
      private volatile boolean pausedInTryToGetInitialLeasePeriod = false;
      private volatile boolean pausedInTryToRenewLeasePeriod = false;
      private volatile boolean pausedInStillInLeasePeriod = false;
  
      public PausableLeaseManager(String id,
                                  TSOChannelHandler tsoChannelHandler,
                                  TSOStateManager stateManager,
                                  long leasePeriodInMs,
                                  String tsoLeasePath,
                                  String currentTSOPath,
                                  CuratorFramework zkClient,
                                  Panicker panicker) {
          super(id, tsoChannelHandler, stateManager, leasePeriodInMs, tsoLeasePath, currentTSOPath, zkClient, panicker);
      }
  
      @Override
      public void tryToGetInitialLeasePeriod() throws Exception {
          while (pausedInTryToGetInitialLeasePeriod) {
              synchronized (this) {
                  try {
                      LOG.info("{} paused in tryToGetInitialLeasePeriod()", this);
                      this.wait();
                  } catch (InterruptedException e) {
                      LOG.error("Interrupted whilst paused");
                      Thread.currentThread().interrupt();
                  }
              }
          }
          super.tryToGetInitialLeasePeriod();
      }
  
      @Override
      public void tryToRenewLeasePeriod() throws Exception {
          while (pausedInTryToRenewLeasePeriod) {
              synchronized (this) {
                  try {
                      LOG.info("{} paused in tryToRenewLeasePeriod()", this);
                      this.wait();
                  } catch (InterruptedException e) {
                      LOG.error("Interrupted whilst paused");
                      Thread.currentThread().interrupt();
                  }
              }
          }
          super.tryToRenewLeasePeriod();
      }
  
      @Override
      public boolean stillInLeasePeriod() {
          while (pausedInStillInLeasePeriod) {
              synchronized (this) {
                  try {
                      LOG.info("{} paused in stillInLeasePeriod()", this);
                      this.wait();
                  } catch (InterruptedException e) {
                      LOG.error("Interrupted whilst paused");
                      Thread.currentThread().interrupt();
                  }
              }
          }
          return super.stillInLeasePeriod();
      }
  
      // ----------------------------------------------------------------------------------------------------------------
      // Helper Methods to pause functionality
      // ----------------------------------------------------------------------------------------------------------------
  
      public synchronized void pausedInTryToGetInitialLeasePeriod() {
          pausedInTryToGetInitialLeasePeriod = true;
          this.notifyAll();
      }
  
     public synchronized void pausedInTryToRenewLeasePeriod() {
         pausedInTryToRenewLeasePeriod = true;
         this.notifyAll();
     }
 
     public synchronized void pausedInStillInLeasePeriod() {
         pausedInStillInLeasePeriod = true;
         this.notifyAll();
     }
 
     public synchronized void resume() {
         pausedInTryToGetInitialLeasePeriod = false;
         pausedInTryToRenewLeasePeriod = false;
         pausedInStillInLeasePeriod = false;
         this.notifyAll();
     }
 
 }