| /** |
| * 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.distributedlog; |
| |
| import com.google.common.base.Preconditions; |
| import org.apache.distributedlog.ZooKeeperClient.Credentials; |
| import org.apache.distributedlog.ZooKeeperClient.DigestCredentials; |
| import org.apache.distributedlog.impl.BKNamespaceDriver; |
| import org.apache.bookkeeper.stats.NullStatsLogger; |
| import org.apache.bookkeeper.stats.StatsLogger; |
| import org.apache.bookkeeper.zookeeper.RetryPolicy; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.net.URI; |
| |
| /** |
| * Builder to build zookeeper client. |
| */ |
| public class ZooKeeperClientBuilder { |
| |
| static final Logger LOG = LoggerFactory.getLogger(ZooKeeperClientBuilder.class); |
| |
| /** |
| * Create a zookeeper client builder to build zookeeper clients. |
| * |
| * @return zookeeper client builder. |
| */ |
| public static ZooKeeperClientBuilder newBuilder() { |
| return new ZooKeeperClientBuilder(); |
| } |
| |
| // name |
| private String name = "default"; |
| // sessionTimeoutMs |
| private int sessionTimeoutMs = -1; |
| // conectionTimeoutMs |
| private int conectionTimeoutMs = -1; |
| // zkServers |
| private String zkServers = null; |
| // retry policy |
| private RetryPolicy retryPolicy = null; |
| // stats logger |
| private StatsLogger statsLogger = NullStatsLogger.INSTANCE; |
| // retry executor thread count |
| private int retryThreadCount = 1; |
| // zookeeper access requestRateLimit limit |
| private double requestRateLimit = 0; |
| // Did call the zkAclId setter on the builder, used to ensure the setter is set. |
| private boolean zkAclIdSet = false; |
| private String zkAclId; |
| |
| // Cached ZooKeeper Client |
| private ZooKeeperClient cachedClient = null; |
| |
| private ZooKeeperClientBuilder() {} |
| |
| /** |
| * Set zookeeper client name |
| * |
| * @param name zookeeper client name |
| * @return zookeeper client builder |
| */ |
| public synchronized ZooKeeperClientBuilder name(String name) { |
| this.name = name; |
| return this; |
| } |
| |
| /** |
| * Set zookeeper session timeout in milliseconds. |
| * |
| * @param sessionTimeoutMs |
| * session timeout in milliseconds. |
| * @return zookeeper client builder. |
| */ |
| public synchronized ZooKeeperClientBuilder sessionTimeoutMs(int sessionTimeoutMs) { |
| this.sessionTimeoutMs = sessionTimeoutMs; |
| if (this.conectionTimeoutMs <= 0) { |
| this.conectionTimeoutMs = 2 * sessionTimeoutMs; |
| } |
| return this; |
| } |
| |
| public synchronized ZooKeeperClientBuilder retryThreadCount(int retryThreadCount) { |
| this.retryThreadCount = retryThreadCount; |
| return this; |
| } |
| |
| public synchronized ZooKeeperClientBuilder requestRateLimit(double requestRateLimit) { |
| this.requestRateLimit = requestRateLimit; |
| return this; |
| } |
| |
| /** |
| * Set zookeeper connection timeout in milliseconds |
| * |
| * @param connectionTimeoutMs |
| * connection timeout ms. |
| * @return builder |
| */ |
| public synchronized ZooKeeperClientBuilder connectionTimeoutMs(int connectionTimeoutMs) { |
| this.conectionTimeoutMs = connectionTimeoutMs; |
| return this; |
| } |
| |
| /** |
| * Set ZooKeeper Connect String. |
| * |
| * @param zkServers |
| * zookeeper servers to connect. |
| * @return builder |
| */ |
| public synchronized ZooKeeperClientBuilder zkServers(String zkServers) { |
| this.zkServers = zkServers; |
| return this; |
| } |
| |
| /** |
| * Set DistributedLog URI. |
| * |
| * @param uri |
| * distributedlog uri. |
| * @return builder. |
| */ |
| public synchronized ZooKeeperClientBuilder uri(URI uri) { |
| this.zkServers = BKNamespaceDriver.getZKServersFromDLUri(uri); |
| return this; |
| } |
| |
| /** |
| * Build zookeeper client using existing <i>zkc</i> client. |
| * |
| * @param zkc |
| * zookeeper client. |
| * @return builder |
| */ |
| public synchronized ZooKeeperClientBuilder zkc(ZooKeeperClient zkc) { |
| this.cachedClient = zkc; |
| return this; |
| } |
| |
| /** |
| * Build zookeeper client with given retry policy <i>retryPolicy</i>. |
| * |
| * @param retryPolicy |
| * retry policy |
| * @return builder |
| */ |
| public synchronized ZooKeeperClientBuilder retryPolicy(RetryPolicy retryPolicy) { |
| this.retryPolicy = retryPolicy; |
| return this; |
| } |
| |
| /** |
| * Build zookeeper client with given stats logger <i>statsLogger</i>. |
| * |
| * @param statsLogger |
| * stats logger to expose zookeeper stats |
| * @return builder |
| */ |
| public synchronized ZooKeeperClientBuilder statsLogger(StatsLogger statsLogger) { |
| this.statsLogger = statsLogger; |
| return this; |
| } |
| |
| /** |
| * * Build zookeeper client with given zk acl digest id <i>zkAclId</i>. |
| */ |
| public synchronized ZooKeeperClientBuilder zkAclId(String zkAclId) { |
| this.zkAclIdSet = true; |
| this.zkAclId = zkAclId; |
| return this; |
| } |
| |
| private void validateParameters() { |
| Preconditions.checkNotNull(zkServers, "No zk servers provided."); |
| Preconditions.checkArgument(conectionTimeoutMs > 0, |
| "Invalid connection timeout : %d", conectionTimeoutMs); |
| Preconditions.checkArgument(sessionTimeoutMs > 0, |
| "Invalid session timeout : %d", sessionTimeoutMs); |
| Preconditions.checkNotNull(statsLogger, "No stats logger provided."); |
| Preconditions.checkArgument(zkAclIdSet, "Zookeeper acl id not set."); |
| } |
| |
| /** |
| * Build a zookeeper client. |
| * |
| * @return zookeeper client. |
| */ |
| public synchronized ZooKeeperClient build() { |
| if (null == cachedClient) { |
| cachedClient = buildClient(); |
| } |
| return cachedClient; |
| } |
| |
| private ZooKeeperClient buildClient() { |
| validateParameters(); |
| |
| Credentials credentials = Credentials.NONE; |
| if (null != zkAclId) { |
| credentials = new DigestCredentials(zkAclId, zkAclId); |
| } |
| |
| return new ZooKeeperClient( |
| name, |
| sessionTimeoutMs, |
| conectionTimeoutMs, |
| zkServers, |
| retryPolicy, |
| statsLogger, |
| retryThreadCount, |
| requestRateLimit, |
| credentials |
| ); |
| } |
| } |