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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.solr.cloud;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.SolrException.ErrorCode;
import org.apache.solr.common.cloud.SolrZkClient;
import org.apache.solr.common.cloud.ZkCmdExecutor;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.KeeperException.NodeExistsException;
import org.apache.zookeeper.data.Stat;
/**
* A distributed map.
* This supports basic map functions e.g. get, put, contains for interaction with zk which
* don't have to be ordered i.e. DistributedQueue.
*/
public class DistributedMap {
protected final String dir;
protected SolrZkClient zookeeper;
protected static final String PREFIX = "mn-";
public DistributedMap(SolrZkClient zookeeper, String dir) {
this.dir = dir;
ZkCmdExecutor cmdExecutor = new ZkCmdExecutor(zookeeper.getZkClientTimeout());
try {
cmdExecutor.ensureExists(dir, zookeeper);
} catch (KeeperException e) {
throw new SolrException(ErrorCode.SERVER_ERROR, e);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new SolrException(ErrorCode.SERVER_ERROR, e);
}
this.zookeeper = zookeeper;
}
public void put(String trackingId, byte[] data) throws KeeperException, InterruptedException {
zookeeper.makePath(dir + "/" + PREFIX + trackingId, data, CreateMode.PERSISTENT, null, false, true);
}
/**
* Puts an element in the map only if there isn't one with the same trackingId already
* @return True if the the element was added. False if it wasn't (because the key already exists)
*/
public boolean putIfAbsent(String trackingId, byte[] data) throws KeeperException, InterruptedException {
try {
zookeeper.makePath(dir + "/" + PREFIX + trackingId, data, CreateMode.PERSISTENT, null, true, true);
return true;
} catch (NodeExistsException e) {
return false;
}
}
public byte[] get(String trackingId) throws KeeperException, InterruptedException {
return zookeeper.getData(dir + "/" + PREFIX + trackingId, null, null, true);
}
public boolean contains(String trackingId) throws KeeperException, InterruptedException {
return zookeeper.exists(dir + "/" + PREFIX + trackingId, true);
}
public int size() throws KeeperException, InterruptedException {
Stat stat = new Stat();
zookeeper.getData(dir, null, stat, true);
return stat.getNumChildren();
}
/**
* return true if the znode was successfully deleted
* false if the node didn't exist and therefore not deleted
* exception an exception occurred while deleting
*/
public boolean remove(String trackingId) throws KeeperException, InterruptedException {
try {
zookeeper.delete(dir + "/" + PREFIX + trackingId, -1, true);
} catch (KeeperException.NoNodeException e) {
return false;
}
return true;
}
/**
* Helper method to clear all child nodes for a parent node.
*/
public void clear() throws KeeperException, InterruptedException {
List childNames = zookeeper.getChildren(dir, null, true);
for(String childName: childNames) {
zookeeper.delete(dir + "/" + childName, -1, true);
}
}
/**
* Returns the keys of all the elements in the map
*/
public Collection keys() throws KeeperException, InterruptedException {
List childs = zookeeper.getChildren(dir, null, true);
final List ids = new ArrayList<>(childs.size());
childs.stream().forEach((child) -> ids.add(child.substring(PREFIX.length())));
return ids;
}
}
