| /** |
| * 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.curator.x.discovery; |
| |
| import org.apache.curator.x.discovery.details.InstanceProvider; |
| import java.io.Closeable; |
| import java.util.Collection; |
| |
| /** |
| * The main API for Discovery. This class is essentially a facade over a {@link ProviderStrategy} |
| * paired with an {@link InstanceProvider} |
| */ |
| public interface ServiceProvider<T> extends Closeable |
| { |
| /** |
| * The provider must be started before use |
| * |
| * @throws Exception any errors |
| */ |
| public void start() throws Exception; |
| |
| /** |
| * Return an instance for a single use. <b>IMPORTANT: </b> users |
| * should not hold on to the instance returned. They should always get a fresh instance. |
| * |
| * @return the instance to use |
| * @throws Exception any errors |
| */ |
| public ServiceInstance<T> getInstance() throws Exception; |
| |
| /** |
| * Return the current available set of instances <b>IMPORTANT: </b> users |
| * should not hold on to the instance returned. They should always get a fresh list. |
| * |
| * @return all known instances |
| * @throws Exception any errors |
| */ |
| public Collection<ServiceInstance<T>> getAllInstances() throws Exception; |
| |
| /** |
| * Take note of an error connecting to the given instance. The instance will potentially |
| * be marked as "down" depending on the {@link DownInstancePolicy}. |
| * |
| * @param instance instance that had an error |
| */ |
| public void noteError(ServiceInstance<T> instance); |
| } |