content: /*
   * Copyright 1999-2018 Alibaba Group Holding Ltd.
   *
   * Licensed 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 com.alibaba.csp.sentinel.cluster.server.connection;
  
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  import java.util.concurrent.ConcurrentSkipListSet;
  import java.util.concurrent.CopyOnWriteArraySet;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import com.alibaba.csp.sentinel.cluster.server.ServerConstants;
  import com.alibaba.csp.sentinel.util.AssertUtil;
  
  /**
   * The connection group stores connection set for a specific namespace.
   *
   * @author Eric Zhao
   * @since 1.4.0
   */
  public class ConnectionGroup {
  
      private final String namespace;
  
      private final Set<ConnectionDescriptor> connectionSet = new CopyOnWriteArraySet<>();
      private final AtomicInteger connectedCount = new AtomicInteger();
  
      public ConnectionGroup(String namespace) {
          AssertUtil.notEmpty(namespace, "namespace cannot be empty");
          this.namespace = namespace;
      }
  
      public ConnectionGroup() {
          this(ServerConstants.DEFAULT_NAMESPACE);
      }
  
      public ConnectionGroup addConnection(String address) {
          AssertUtil.notEmpty(address, "address cannot be empty");
  
          String[] ip = address.split(":");
          String host;
          if (ip != null && ip.length >= 1) {
              host = ip[0];
          } else {
              host = address;
          }
          boolean newAdded = connectionSet.add(new ConnectionDescriptor().setAddress(address).setHost(host));
          if (newAdded) {
              connectedCount.incrementAndGet();
          }
  
          return this;
      }
  
      public ConnectionGroup removeConnection(String address) {
          AssertUtil.notEmpty(address, "address cannot be empty");
  
          if (connectionSet.remove(new ConnectionDescriptor().setAddress(address))) {
              connectedCount.decrementAndGet();
          }
  
          return this;
      }
  
      public String getNamespace() {
          return namespace;
      }
  
      public Set<ConnectionDescriptor> getConnectionSet() {
          return connectionSet;
      }
  
      public int getConnectedCount() {
          return connectedCount.get();
      }
  }
  