| /** |
| * 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.client.routing; |
| |
| import com.google.common.collect.Sets; |
| import com.twitter.finagle.NoBrokersAvailableException; |
| import com.twitter.finagle.stats.StatsReceiver; |
| import java.net.SocketAddress; |
| import java.util.HashMap; |
| import java.util.LinkedHashSet; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.CopyOnWriteArrayList; |
| |
| /** |
| * A local routing service that used for testing. |
| */ |
| public class LocalRoutingService implements RoutingService { |
| |
| public static Builder newBuilder() { |
| return new Builder(); |
| } |
| |
| /** |
| * Builder to build a local routing service for testing. |
| */ |
| public static class Builder implements RoutingService.Builder { |
| |
| private Builder() {} |
| |
| @Override |
| public RoutingService.Builder statsReceiver(StatsReceiver statsReceiver) { |
| return this; |
| } |
| |
| @Override |
| public LocalRoutingService build() { |
| return new LocalRoutingService(); |
| } |
| } |
| |
| private final Map<String, LinkedHashSet<SocketAddress>> localAddresses = |
| new HashMap<String, LinkedHashSet<SocketAddress>>(); |
| private final CopyOnWriteArrayList<RoutingListener> listeners = |
| new CopyOnWriteArrayList<RoutingListener>(); |
| |
| boolean allowRetrySameHost = true; |
| |
| @Override |
| public void startService() { |
| // nop |
| } |
| |
| @Override |
| public void stopService() { |
| // nop |
| } |
| |
| @Override |
| public synchronized Set<SocketAddress> getHosts() { |
| Set<SocketAddress> hosts = Sets.newHashSet(); |
| for (LinkedHashSet<SocketAddress> addresses : localAddresses.values()) { |
| hosts.addAll(addresses); |
| } |
| return hosts; |
| } |
| |
| @Override |
| public RoutingService registerListener(RoutingListener listener) { |
| listeners.add(listener); |
| return this; |
| } |
| |
| @Override |
| public RoutingService unregisterListener(RoutingListener listener) { |
| listeners.remove(listener); |
| return this; |
| } |
| |
| public LocalRoutingService setAllowRetrySameHost(boolean enabled) { |
| allowRetrySameHost = enabled; |
| return this; |
| } |
| |
| public LocalRoutingService addHost(String stream, SocketAddress address) { |
| boolean notify = false; |
| synchronized (this) { |
| LinkedHashSet<SocketAddress> addresses = localAddresses.get(stream); |
| if (null == addresses) { |
| addresses = new LinkedHashSet<SocketAddress>(); |
| localAddresses.put(stream, addresses); |
| } |
| if (addresses.add(address)) { |
| notify = true; |
| } |
| } |
| if (notify) { |
| for (RoutingListener listener : listeners) { |
| listener.onServerJoin(address); |
| } |
| } |
| return this; |
| } |
| |
| @Override |
| public synchronized SocketAddress getHost(String key, RoutingContext rContext) |
| throws NoBrokersAvailableException { |
| LinkedHashSet<SocketAddress> addresses = localAddresses.get(key); |
| |
| SocketAddress candidate = null; |
| if (null != addresses) { |
| for (SocketAddress host : addresses) { |
| if (rContext.isTriedHost(host) && !allowRetrySameHost) { |
| continue; |
| } else { |
| candidate = host; |
| break; |
| } |
| } |
| } |
| if (null != candidate) { |
| return candidate; |
| } |
| throw new NoBrokersAvailableException("No host available"); |
| } |
| |
| @Override |
| public void removeHost(SocketAddress address, Throwable reason) { |
| // nop |
| } |
| } |