org.zookeeper.app.ConfigWatcher.java Source code

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Here is the source code for org.zookeeper.app.ConfigWatcher.java

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/**
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.zookeeper.app;

import com.netflix.curator.framework.CuratorFramework;
import com.netflix.curator.framework.api.CuratorWatcher;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;

public class ConfigWatcher implements CuratorWatcher {
    private ActiveKeyValueStore store;
    public static int readNumber;

    public ConfigWatcher(CuratorFramework client) {
        this.store = new ActiveKeyValueStore(client);
    }

    public void displayConfig() throws Exception {
        String value = store.read(ConfigUpdater.PATH, this);
        System.out.printf("Read %s as %s\n", ConfigUpdater.PATH, value);
        readNumber++;
    }

    @Override
    public void process(WatchedEvent event) {
        if (event.getType() == Watcher.Event.EventType.NodeDataChanged)
            try {
                displayConfig();
            } catch (InterruptedException e) {
                System.err.println("Interrupted. Exiting.");
                Thread.currentThread().interrupt();
            } catch (KeeperException e) {
                System.err.printf("KeeperException: %s. Exiting.\n", e);
            } catch (Exception e) {
                System.err.println("Unsupported. Exiting.");
                Thread.currentThread().interrupt();
            }
    }

}