| /** |
| * 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 static com.google.common.base.Preconditions.checkArgument; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import io.netty.channel.EventLoopGroup; |
| import io.netty.util.HashedWheelTimer; |
| import java.util.Optional; |
| import org.apache.bookkeeper.feature.FeatureProvider; |
| import org.apache.bookkeeper.stats.NullStatsLogger; |
| import org.apache.bookkeeper.stats.StatsLogger; |
| |
| /** |
| * Builder to build bookkeeper client. |
| */ |
| public class BookKeeperClientBuilder { |
| |
| /** |
| * Create a bookkeeper client builder to build bookkeeper clients. |
| * |
| * @return bookkeeper client builder. |
| */ |
| public static BookKeeperClientBuilder newBuilder() { |
| return new BookKeeperClientBuilder(); |
| } |
| |
| // client name |
| private String name = null; |
| // dl config |
| private DistributedLogConfiguration dlConfig = null; |
| // bookkeeper settings |
| // zookeeper client |
| private ZooKeeperClient zkc = null; |
| // or zookeeper servers |
| private String zkServers = null; |
| // ledgers path |
| private String ledgersPath = null; |
| // statsLogger |
| private StatsLogger statsLogger = NullStatsLogger.INSTANCE; |
| // client channel factory |
| private EventLoopGroup eventLoopGroup = null; |
| // request timer |
| private HashedWheelTimer requestTimer = null; |
| // feature provider |
| private Optional<FeatureProvider> featureProvider = Optional.empty(); |
| |
| // Cached BookKeeper Client |
| private BookKeeperClient cachedClient = null; |
| |
| /** |
| * Private bookkeeper builder. |
| */ |
| private BookKeeperClientBuilder() {} |
| |
| /** |
| * Set client name. |
| * |
| * @param name |
| * client name. |
| * @return builder |
| */ |
| public synchronized BookKeeperClientBuilder name(String name) { |
| this.name = name; |
| return this; |
| } |
| |
| /** |
| * <i>dlConfig</i> used to configure bookkeeper client. |
| * |
| * @param dlConfig |
| * distributedlog config. |
| * @return builder. |
| */ |
| public synchronized BookKeeperClientBuilder dlConfig(DistributedLogConfiguration dlConfig) { |
| this.dlConfig = dlConfig; |
| return this; |
| } |
| |
| /** |
| * Set the zkc used to build bookkeeper client. If a zookeeper client is provided in this |
| * method, bookkeeper client will use it rather than creating a brand new one. |
| * |
| * @param zkc |
| * zookeeper client. |
| * @return builder |
| * @see #zkServers(String) |
| */ |
| public synchronized BookKeeperClientBuilder zkc(ZooKeeperClient zkc) { |
| this.zkc = zkc; |
| return this; |
| } |
| |
| /** |
| * Set the zookeeper servers that bookkeeper client would connect to. If no zookeeper client |
| * is provided by {@link #zkc(ZooKeeperClient)}, bookkeeper client will use the given string |
| * to create a brand new zookeeper client. |
| * |
| * @param zkServers |
| * zookeeper servers that bookkeeper client would connect to. |
| * @return builder |
| * @see #zkc(ZooKeeperClient) |
| */ |
| public synchronized BookKeeperClientBuilder zkServers(String zkServers) { |
| this.zkServers = zkServers; |
| return this; |
| } |
| |
| /** |
| * Set the ledgers path that bookkeeper client is going to access. |
| * |
| * @param ledgersPath |
| * ledgers path |
| * @return builder |
| * @see org.apache.bookkeeper.conf.ClientConfiguration#getZkLedgersRootPath() |
| */ |
| public synchronized BookKeeperClientBuilder ledgersPath(String ledgersPath) { |
| this.ledgersPath = ledgersPath; |
| return this; |
| } |
| |
| /** |
| * Build BookKeeper client using existing <i>bkc</i> client. |
| * |
| * @param bkc |
| * bookkeeper client. |
| * @return builder |
| */ |
| public synchronized BookKeeperClientBuilder bkc(BookKeeperClient bkc) { |
| this.cachedClient = bkc; |
| return this; |
| } |
| |
| /** |
| * Build BookKeeper client using existing <i>channelFactory</i>. |
| * |
| * @param eventLoopGroup |
| * event loop group used to build bookkeeper client. |
| * @return bookkeeper client builder. |
| */ |
| public synchronized BookKeeperClientBuilder eventLoopGroup(EventLoopGroup eventLoopGroup) { |
| this.eventLoopGroup = eventLoopGroup; |
| return this; |
| } |
| |
| /** |
| * Build BookKeeper client using existing <i>request timer</i>. |
| * |
| * @param requestTimer |
| * HashedWheelTimer used to build bookkeeper client. |
| * @return bookkeeper client builder. |
| */ |
| public synchronized BookKeeperClientBuilder requestTimer(HashedWheelTimer requestTimer) { |
| this.requestTimer = requestTimer; |
| return this; |
| } |
| |
| /** |
| * Build BookKeeper Client using given stats logger <i>statsLogger</i>. |
| * |
| * @param statsLogger |
| * stats logger to report stats |
| * @return builder. |
| */ |
| public synchronized BookKeeperClientBuilder statsLogger(StatsLogger statsLogger) { |
| this.statsLogger = statsLogger; |
| return this; |
| } |
| |
| public synchronized BookKeeperClientBuilder featureProvider(Optional<FeatureProvider> featureProvider) { |
| this.featureProvider = featureProvider; |
| return this; |
| } |
| |
| private void validateParameters() { |
| checkNotNull(name, "Missing client name."); |
| checkNotNull(dlConfig, "Missing DistributedLog Configuration."); |
| checkArgument(null == zkc || null == zkServers, "Missing zookeeper setting."); |
| checkNotNull(ledgersPath, "Missing Ledgers Root Path."); |
| } |
| |
| public synchronized BookKeeperClient build() { |
| if (null == cachedClient) { |
| cachedClient = buildClient(); |
| } |
| return cachedClient; |
| } |
| |
| private BookKeeperClient buildClient() { |
| validateParameters(); |
| return new BookKeeperClient( |
| dlConfig, |
| name, |
| zkServers, |
| zkc, |
| ledgersPath, |
| eventLoopGroup, |
| requestTimer, |
| statsLogger, |
| featureProvider); |
| } |
| } |