org.apache.accumulo.server.conf.TableConfWatcher.java Source code

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Here is the source code for org.apache.accumulo.server.conf.TableConfWatcher.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
 *
 *     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.accumulo.server.conf;

import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.client.Instance;
import org.apache.accumulo.core.zookeeper.ZooUtil;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.zookeeper.WatchedEvent;
import org.apache.zookeeper.Watcher;

class TableConfWatcher implements Watcher {
    static {
        Logger.getLogger("org.apache.zookeeper").setLevel(Level.WARN);
        Logger.getLogger("org.apache.hadoop.io.compress").setLevel(Level.WARN);
    }

    private static final Logger log = Logger.getLogger(TableConfWatcher.class);
    private final Instance instance;
    private final String tablesPrefix;
    private ServerConfigurationFactory scf;

    TableConfWatcher(Instance instance) {
        this.instance = instance;
        tablesPrefix = ZooUtil.getRoot(instance) + Constants.ZTABLES + "/";
        scf = new ServerConfigurationFactory(instance);
    }

    static String toString(WatchedEvent event) {
        return new StringBuilder("{path=").append(event.getPath()).append(",state=").append(event.getState())
                .append(",type=").append(event.getType()).append("}").toString();
    }

    @Override
    public void process(WatchedEvent event) {
        String path = event.getPath();
        if (log.isTraceEnabled())
            log.trace("WatchedEvent : " + toString(event));

        String tableId = null;
        String key = null;

        if (path != null) {
            if (path.startsWith(tablesPrefix)) {
                tableId = path.substring(tablesPrefix.length());
                if (tableId.contains("/")) {
                    tableId = tableId.substring(0, tableId.indexOf('/'));
                    if (path.startsWith(tablesPrefix + tableId + Constants.ZTABLE_CONF + "/"))
                        key = path.substring((tablesPrefix + tableId + Constants.ZTABLE_CONF + "/").length());
                }
            }

            if (tableId == null) {
                log.warn("Zookeeper told me about a path I was not watching: " + path + ", event "
                        + toString(event));
                return;
            }
        }

        switch (event.getType()) {
        case NodeDataChanged:
            if (log.isTraceEnabled())
                log.trace("EventNodeDataChanged " + event.getPath());
            if (key != null)
                scf.getTableConfiguration(tableId).propertyChanged(key);
            break;
        case NodeChildrenChanged:
            scf.getTableConfiguration(tableId).propertiesChanged();
            break;
        case NodeDeleted:
            if (key == null) {
                // only remove the AccumuloConfiguration object when a
                // table node is deleted, not when a tables property is
                // deleted.
                ServerConfigurationFactory.removeCachedTableConfiguration(instance.getInstanceID(), tableId);
            }
            break;
        case None:
            switch (event.getState()) {
            case Expired:
                ServerConfigurationFactory.expireAllTableObservers();
                break;
            case SyncConnected:
                break;
            case Disconnected:
                break;
            default:
                log.warn("EventNone event not handled " + toString(event));
            }
            break;
        case NodeCreated:
            switch (event.getState()) {
            case SyncConnected:
                break;
            default:
                log.warn("Event NodeCreated event not handled " + toString(event));
            }
            break;
        default:
            log.warn("Event not handled " + toString(event));
        }
    }
}