content: /*
   * 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.camel.component.zookeeper.operations;
  
  import org.apache.zookeeper.Watcher.Event.EventType;
  import org.apache.zookeeper.ZooKeeper;
  import org.apache.zookeeper.data.Stat;
  
  /**
   * <code>DataChangedOperation</code> is an watch driven operation. It will wait for an watched event indicating that a
   * given node has been created or deleted.
   */
  public class ExistenceChangedOperation extends FutureEventDrivenOperation<String> {
  
      public ExistenceChangedOperation(ZooKeeper connection, String znode) {
          super(connection, znode, EventType.NodeCreated, EventType.NodeDeleted);
      }
  
      @Override
      protected void installWatch() {
          connection.exists(getNode(), this, (int rc, String path, Object ctx, Stat stat) -> {
          }, null);
          if (LOG.isDebugEnabled()) {
              LOG.debug("Installed exists watch");
          }
      }
  
      @Override
      public OperationResult<String> getResult() {
          try {
              String path = getNode();
              Stat statistics = connection.exists(path, true);
              return new OperationResult<>(path, statistics);
          } catch (InterruptedException e) {
              Thread.currentThread().interrupt();
              return new OperationResult<>(e);
          } catch (Exception e) {
              return new OperationResult<>(e);
          }
      }
  }
  