| // 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. |
| |
| using System.Collections.Concurrent; |
| using System.Collections.Generic; |
| using System.Linq; |
| using System.Net; |
| using System.Threading; |
| using Org.Apache.REEF.Common.Io; |
| using Org.Apache.REEF.Network.Naming.Events; |
| using Org.Apache.REEF.Wake.Remote.Impl; |
| |
| namespace Org.Apache.REEF.Network.Naming |
| { |
| /// <summary> |
| /// Helper class to send lookup events to the name server |
| /// </summary> |
| internal sealed class NameLookupClient |
| { |
| private readonly TransportClient<NamingEvent> _client; |
| private readonly BlockingCollection<NamingLookupResponse> _lookupResponseQueue; |
| private readonly BlockingCollection<NamingGetAllResponse> _getAllResponseQueue; |
| |
| /// <summary> |
| /// Constructs a new NameLookupClient. |
| /// </summary> |
| /// <param name="client">The transport client used to connect to the NameServer</param> |
| /// <param name="lookupQueue">The queue used to signal that a response |
| /// has been received from the NameServer</param> |
| /// <param name="getAllQueue">The queue used to signal that a GetAllResponse |
| /// has been received from the NameServer</param> |
| public NameLookupClient(TransportClient<NamingEvent> client, |
| BlockingCollection<NamingLookupResponse> lookupQueue, |
| BlockingCollection<NamingGetAllResponse> getAllQueue) |
| { |
| _client = client; |
| _lookupResponseQueue = lookupQueue; |
| _getAllResponseQueue = getAllQueue; |
| } |
| |
| /// <summary> |
| /// Look up the IPEndPoint that has been registered with the NameServer using |
| /// the given identifier as the key. |
| /// </summary> |
| /// <param name="id">The id for the IPEndPoint</param> |
| /// <param name="token">The cancellation token used for timeout</param> |
| /// <returns>The registered IPEndpoint, or null if the identifier has not |
| /// been registered with the NameServer or if the operation times out.</returns> |
| public IPEndPoint Lookup(string id, CancellationToken token) |
| { |
| List<string> ids = new List<string> { id }; |
| List<NameAssignment> assignment = Lookup(ids); |
| return (assignment == null || assignment.Count == 0) ? null : assignment.First().Endpoint; |
| } |
| |
| /// <summary> |
| /// Look up IPEndPoints that have been registered with the NameService |
| /// </summary> |
| /// <param name="ids">The list of ids to look up</param> |
| /// <returns>A list of NameAssignments representing the mapped identifier/IPEndpoint |
| /// pairs</returns> |
| public List<NameAssignment> Lookup(List<string> ids) |
| { |
| _client.Send(new NamingLookupRequest(ids)); |
| NamingLookupResponse response = _lookupResponseQueue.Take(); |
| return response.NameAssignments; |
| } |
| |
| /// <summary> |
| /// Synchronously gets all of the identifier/IPEndpoint pairs registered with the NameService. |
| /// </summary> |
| /// <returns>A list of NameAssignments representing the mapped identifier/IPEndpoint |
| /// pairs</returns> |
| public List<NameAssignment> GetAll() |
| { |
| _client.Send(new NamingGetAllRequest()); |
| NamingGetAllResponse response = _getAllResponseQueue.Take(); |
| return response.Assignments; |
| } |
| } |
| } |