content: /*
   * 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.bifromq.basecluster.memberlist.agent;
  
  import org.apache.bifromq.basecluster.agent.proto.AgentEndpoint;
  import org.apache.bifromq.basecluster.membership.proto.HostEndpoint;
  import org.apache.bifromq.basecluster.membership.proto.HostMember;
  import io.reactivex.rxjava3.core.Observable;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Set;
  
  public class AgentAddressProvider implements IAgentAddressProvider {
      private final String agentId;
      private final Observable<Map<HostEndpoint, HostMember>> aliveHosts;
  
      public AgentAddressProvider(String agentId, Observable<Map<HostEndpoint, HostMember>> aliveHosts) {
          this.agentId = agentId;
          this.aliveHosts = aliveHosts;
      }
  
      @Override
      public Observable<Set<AgentEndpoint>> agentAddress() {
          return aliveHosts
              .map(aliveHostList -> {
                  Set<AgentEndpoint> agentHosts = new HashSet<>();
                  for (HostMember record : aliveHostList.values()) {
                      if (record.containsAgent(agentId)) {
                          agentHosts.add(AgentEndpoint.newBuilder()
                              .setEndpoint(record.getEndpoint())
                              .setIncarnation(record.getAgentMap().get(agentId))
                              .build());
                      }
                  }
                  return agentHosts;
              })
              .distinctUntilChanged();
      }
  }
  