org.apache.camel.component.zookeeper.operations.ExistsOperation Maven / Gradle / Ivy
/**
* 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.ZooKeeper;
import org.apache.zookeeper.data.Stat;
/**
* ExistsOperation is a basic ZooKeeper operation used to test the
* existence of a given node.
*/
public class ExistsOperation extends ZooKeeperOperation {
private boolean mustExist;
public ExistsOperation(ZooKeeper connection, String node) {
this(connection, node, true);
}
public ExistsOperation(ZooKeeper connection, String node, boolean mustExist) {
super(connection, node);
this.mustExist = mustExist;
}
@Override
public OperationResult getResult() {
try {
Stat statistics = connection.exists(node, true);
boolean ok = isOk(statistics);
if (LOG.isTraceEnabled()) {
LOG.trace(ok ? "node exists" : "node does not exist");
}
return new OperationResult(node, statistics, ok);
} catch (Exception e) {
return new OperationResult(e);
}
}
private boolean isOk(Stat statistics) {
boolean ok = false;
if (mustExist) {
ok = statistics != null;
} else {
ok = statistics == null;
}
return ok;
}
}