| /* |
| * 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.Map; |
| import java.util.function.Predicate; |
| |
| import org.apache.accumulo.core.Constants; |
| import org.apache.accumulo.core.client.Instance; |
| import org.apache.accumulo.core.client.impl.Namespaces; |
| import org.apache.accumulo.core.conf.AccumuloConfiguration; |
| import org.apache.accumulo.core.conf.ConfigurationObserver; |
| import org.apache.accumulo.core.conf.ObservableConfiguration; |
| import org.apache.accumulo.core.conf.Property; |
| import org.apache.accumulo.core.zookeeper.ZooUtil; |
| import org.apache.accumulo.fate.zookeeper.ZooCache; |
| import org.apache.accumulo.fate.zookeeper.ZooCacheFactory; |
| import org.apache.accumulo.server.client.HdfsZooInstance; |
| import org.apache.accumulo.server.conf.ZooCachePropertyAccessor.PropCacheKey; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| public class NamespaceConfiguration extends ObservableConfiguration { |
| private static final Logger log = LoggerFactory.getLogger(NamespaceConfiguration.class); |
| |
| private static final Map<PropCacheKey,ZooCache> propCaches = new java.util.HashMap<>(); |
| |
| private final AccumuloConfiguration parent; |
| private ZooCachePropertyAccessor propCacheAccessor = null; |
| protected String namespaceId = null; |
| protected Instance inst = null; |
| private ZooCacheFactory zcf = new ZooCacheFactory(); |
| |
| public NamespaceConfiguration(String namespaceId, AccumuloConfiguration parent) { |
| this(namespaceId, HdfsZooInstance.getInstance(), parent); |
| } |
| |
| public NamespaceConfiguration(String namespaceId, Instance inst, AccumuloConfiguration parent) { |
| this.inst = inst; |
| this.parent = parent; |
| this.namespaceId = namespaceId; |
| } |
| |
| /** |
| * Gets the parent configuration of this configuration. |
| * |
| * @return parent configuration |
| */ |
| public AccumuloConfiguration getParentConfiguration() { |
| return parent; |
| } |
| |
| void setZooCacheFactory(ZooCacheFactory zcf) { |
| this.zcf = zcf; |
| } |
| |
| private synchronized ZooCachePropertyAccessor getPropCacheAccessor() { |
| if (propCacheAccessor == null) { |
| synchronized (propCaches) { |
| PropCacheKey key = new PropCacheKey(inst.getInstanceID(), namespaceId); |
| ZooCache propCache = propCaches.get(key); |
| if (propCache == null) { |
| propCache = zcf.getZooCache(inst.getZooKeepers(), inst.getZooKeepersSessionTimeOut(), new NamespaceConfWatcher(inst)); |
| propCaches.put(key, propCache); |
| } |
| propCacheAccessor = new ZooCachePropertyAccessor(propCache); |
| } |
| } |
| return propCacheAccessor; |
| } |
| |
| private String getPath() { |
| return ZooUtil.getRoot(inst.getInstanceID()) + Constants.ZNAMESPACES + "/" + getNamespaceId() + Constants.ZNAMESPACE_CONF; |
| } |
| |
| @Override |
| public String get(Property property) { |
| String key = property.getKey(); |
| AccumuloConfiguration getParent; |
| if (!(namespaceId.equals(Namespaces.ACCUMULO_NAMESPACE_ID) && isIteratorOrConstraint(key))) { |
| getParent = parent; |
| } else { |
| // ignore iterators from parent if system namespace |
| getParent = null; |
| } |
| return getPropCacheAccessor().get(property, getPath(), getParent); |
| } |
| |
| private class SystemNamespaceFilter implements Predicate<String> { |
| |
| private Predicate<String> userFilter; |
| |
| SystemNamespaceFilter(Predicate<String> userFilter) { |
| this.userFilter = userFilter; |
| } |
| |
| @Override |
| public boolean test(String key) { |
| if (isIteratorOrConstraint(key)) |
| return false; |
| return userFilter.test(key); |
| } |
| |
| } |
| |
| @Override |
| public void getProperties(Map<String,String> props, Predicate<String> filter) { |
| Predicate<String> parentFilter = filter; |
| // exclude system iterators/constraints from the system namespace |
| // so they don't affect the metadata or root tables. |
| if (getNamespaceId().equals(Namespaces.ACCUMULO_NAMESPACE_ID)) |
| parentFilter = new SystemNamespaceFilter(filter); |
| |
| getPropCacheAccessor().getProperties(props, getPath(), filter, parent, parentFilter); |
| } |
| |
| protected String getNamespaceId() { |
| return namespaceId; |
| } |
| |
| @Override |
| public void addObserver(ConfigurationObserver co) { |
| if (namespaceId == null) { |
| String err = "Attempt to add observer for non-namespace configuration"; |
| log.error(err); |
| throw new RuntimeException(err); |
| } |
| iterator(); |
| super.addObserver(co); |
| } |
| |
| @Override |
| public void removeObserver(ConfigurationObserver co) { |
| if (namespaceId == null) { |
| String err = "Attempt to remove observer for non-namespace configuration"; |
| log.error(err); |
| throw new RuntimeException(err); |
| } |
| super.removeObserver(co); |
| } |
| |
| static boolean isIteratorOrConstraint(String key) { |
| return key.startsWith(Property.TABLE_ITERATOR_PREFIX.getKey()) || key.startsWith(Property.TABLE_CONSTRAINT_PREFIX.getKey()); |
| } |
| |
| @Override |
| public synchronized void invalidateCache() { |
| if (null != propCacheAccessor) { |
| propCacheAccessor.invalidateCache(); |
| } |
| // Else, if the accessor is null, we could lock and double-check |
| // to see if it happened to be created so we could invalidate its cache |
| // but I don't see much benefit coming from that extra check. |
| } |
| } |