Package org.apache.accumulo.server.conf

Source Code of org.apache.accumulo.server.conf.TableConfiguration

/*
* 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 java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.TreeMap;
import java.util.Map.Entry;

import org.apache.accumulo.core.Constants;
import org.apache.accumulo.core.client.Instance;
import org.apache.accumulo.core.conf.AccumuloConfiguration;
import org.apache.accumulo.core.conf.ConfigurationObserver;
import org.apache.accumulo.core.conf.Property;
import org.apache.accumulo.core.zookeeper.ZooCache;
import org.apache.accumulo.core.zookeeper.ZooUtil;
import org.apache.accumulo.server.client.HdfsZooInstance;
import org.apache.log4j.Logger;

public class TableConfiguration extends AccumuloConfiguration {
  private static final Logger log = Logger.getLogger(TableConfiguration.class);
 
  private static ZooCache tablePropCache = null;
  private final String instanceId;
  private final AccumuloConfiguration parent;
 
  private String table = null;
  private Set<ConfigurationObserver> observers;
 
  public TableConfiguration(String instanceId, String table, AccumuloConfiguration parent) {
    this.instanceId = instanceId;
    this.table = table;
    this.parent = parent;
   
    this.observers = Collections.synchronizedSet(new HashSet<ConfigurationObserver>());
  }
 
  /**
   * @deprecated not for client use
   */
  @Deprecated
  private static ZooCache getTablePropCache() {
    Instance inst = HdfsZooInstance.getInstance();
    if (tablePropCache == null)
      synchronized (TableConfiguration.class) {
        if (tablePropCache == null)
          tablePropCache = new ZooCache(inst.getZooKeepers(), inst.getZooKeepersSessionTimeOut(), new TableConfWatcher(inst.getInstanceID()));
      }
    return tablePropCache;
  }
 
  public void addObserver(ConfigurationObserver co) {
    if (table == null) {
      String err = "Attempt to add observer for non-table configuration";
      log.error(err);
      throw new RuntimeException(err);
    }
    iterator();
    observers.add(co);
  }
 
  public void removeObserver(ConfigurationObserver configObserver) {
    if (table == null) {
      String err = "Attempt to remove observer for non-table configuration";
      log.error(err);
      throw new RuntimeException(err);
    }
    observers.remove(configObserver);
  }
 
  public void expireAllObservers() {
    Collection<ConfigurationObserver> copy = Collections.unmodifiableCollection(observers);
    for (ConfigurationObserver co : copy)
      co.sessionExpired();
  }
 
  public void propertyChanged(String key) {
    Collection<ConfigurationObserver> copy = Collections.unmodifiableCollection(observers);
    for (ConfigurationObserver co : copy)
      co.propertyChanged(key);
  }
 
  public void propertiesChanged(String key) {
    Collection<ConfigurationObserver> copy = Collections.unmodifiableCollection(observers);
    for (ConfigurationObserver co : copy)
      co.propertiesChanged();
  }
 
  public String get(Property property) {
    String key = property.getKey();
    String value = get(key);
   
    if (value == null || !property.getType().isValidFormat(value)) {
      if (value != null)
        log.error("Using default value for " + key + " due to improperly formatted " + property.getType() + ": " + value);
      value = parent.get(property);
    }
    return value;
  }
 
  private String get(String key) {
    String zPath = ZooUtil.getRoot(instanceId) + Constants.ZTABLES + "/" + table + Constants.ZTABLE_CONF + "/" + key;
    byte[] v = getTablePropCache().get(zPath);
    String value = null;
    if (v != null)
      value = new String(v);
    return value;
  }
 
  public static void invalidateCache() {
    if (tablePropCache != null)
      tablePropCache.clear();
  }
 
  @Override
  public Iterator<Entry<String,String>> iterator() {
    TreeMap<String,String> entries = new TreeMap<String,String>();
   
    for (Entry<String,String> parentEntry : parent)
      entries.put(parentEntry.getKey(), parentEntry.getValue());
   
    List<String> children = getTablePropCache().getChildren(ZooUtil.getRoot(instanceId) + Constants.ZTABLES + "/" + table + Constants.ZTABLE_CONF);
    if (children != null) {
      for (String child : children) {
        String value = get(child);
        if (child != null && value != null)
          entries.put(child, value);
      }
    }
   
    return entries.entrySet().iterator();
  }
}
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