| /** |
| * 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 static com.google.common.base.Preconditions.checkNotNull; |
| |
| import com.google.common.collect.Sets; |
| import com.twitter.finagle.NoBrokersAvailableException; |
| import com.twitter.finagle.stats.StatsReceiver; |
| import java.net.SocketAddress; |
| import java.util.Set; |
| import java.util.concurrent.CopyOnWriteArraySet; |
| |
| /** |
| * Single Host Routing Service. |
| */ |
| public class SingleHostRoutingService implements RoutingService { |
| |
| public static SingleHostRoutingService of(SocketAddress address) { |
| return new SingleHostRoutingService(address); |
| } |
| |
| /** |
| * Builder to build single host based routing service. |
| * |
| * @return builder to build single host based routing service. |
| */ |
| public static Builder newBuilder() { |
| return new Builder(); |
| } |
| |
| /** |
| * Builder to build single host based routing service. |
| */ |
| public static class Builder implements RoutingService.Builder { |
| |
| private SocketAddress address; |
| |
| private Builder() {} |
| |
| public Builder address(SocketAddress address) { |
| this.address = address; |
| return this; |
| } |
| |
| @Override |
| public RoutingService.Builder statsReceiver(StatsReceiver statsReceiver) { |
| return this; |
| } |
| |
| @Override |
| public RoutingService build() { |
| checkNotNull(address, "Host is null"); |
| return new SingleHostRoutingService(address); |
| } |
| } |
| |
| private SocketAddress address; |
| private final CopyOnWriteArraySet<RoutingListener> listeners = |
| new CopyOnWriteArraySet<RoutingListener>(); |
| |
| SingleHostRoutingService(SocketAddress address) { |
| this.address = address; |
| } |
| |
| public void setAddress(SocketAddress address) { |
| this.address = address; |
| } |
| |
| @Override |
| public Set<SocketAddress> getHosts() { |
| return Sets.newHashSet(address); |
| } |
| |
| @Override |
| public void startService() { |
| // no-op |
| for (RoutingListener listener : listeners) { |
| listener.onServerJoin(address); |
| } |
| } |
| |
| @Override |
| public void stopService() { |
| // no-op |
| } |
| |
| @Override |
| public RoutingService registerListener(RoutingListener listener) { |
| listeners.add(listener); |
| return this; |
| } |
| |
| @Override |
| public RoutingService unregisterListener(RoutingListener listener) { |
| listeners.remove(listener); |
| return null; |
| } |
| |
| @Override |
| public SocketAddress getHost(String key, RoutingContext rContext) |
| throws NoBrokersAvailableException { |
| if (rContext.isTriedHost(address)) { |
| throw new NoBrokersAvailableException("No hosts is available : routing context = " + rContext); |
| } |
| return address; |
| } |
| |
| @Override |
| public void removeHost(SocketAddress address, Throwable reason) { |
| // no-op |
| } |
| } |