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ConnectionGroupManager.java

/*
  Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved.

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception
  <http://www.mysql.com/about/legal/licensing/foss-exception.html>.

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA
 
 */
package com.mysql.jdbc;

import java.sql.SQLException;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.mysql.jdbc.jmx.LoadBalanceConnectionGroupManager;

00036 public class ConnectionGroupManager {

      private static HashMap GROUP_MAP = new HashMap();

      private static LoadBalanceConnectionGroupManager mbean = new LoadBalanceConnectionGroupManager();
      
      private static boolean hasRegisteredJmx = false;
      
      
      public static synchronized ConnectionGroup getConnectionGroupInstance(String groupName){
            if(GROUP_MAP.containsKey(groupName)){
                  return (ConnectionGroup) GROUP_MAP.get(groupName);
            }
            ConnectionGroup group = new ConnectionGroup(groupName);
            GROUP_MAP.put(groupName, group);
            return group;
      }
      
      public static void registerJmx() throws SQLException {
            if(hasRegisteredJmx){
                  return;
            }
            
            mbean.registerJmx();
            hasRegisteredJmx = true;
      }
      
      public static ConnectionGroup getConnectionGroup(String groupName){
            return (ConnectionGroup) GROUP_MAP.get(groupName);
      }
      
      private static Collection getGroupsMatching(String group){
            if(group == null || group.equals("")){
                  Set s = new HashSet();
                  
                  s.addAll(GROUP_MAP.values());
                  return s;
            }
            Set s = new HashSet();
            Object o = GROUP_MAP.get(group);
            if(o != null){
                  s.add(o);
            }
            return s;
            
      }

      public static void addHost(String group, String host, boolean forExisting) {
            Collection s = getGroupsMatching(group);
            for(Iterator i = s.iterator(); i.hasNext();){
                  ((ConnectionGroup) i.next()).addHost(host, forExisting);
            }
      }

      public static int getActiveHostCount(String group) {
            
            Set active = new HashSet();
            Collection s = getGroupsMatching(group);
            for(Iterator i = s.iterator(); i.hasNext();){
                  active.addAll(((ConnectionGroup) i.next()).getInitialHosts());
            }
            return active.size();
      }
      
      

      public static long getActiveLogicalConnectionCount(String group) {
            int count = 0;
            Collection s = getGroupsMatching(group);
            for(Iterator i = s.iterator(); i.hasNext();){
                  count += ((ConnectionGroup) i.next()).getActiveLogicalConnectionCount();
            }
            return count;
      }

      public static long getActivePhysicalConnectionCount(String group) {
            int count = 0;
            Collection s = getGroupsMatching(group);
            for(Iterator i = s.iterator(); i.hasNext();){
                  count += ((ConnectionGroup) i.next()).getActivePhysicalConnectionCount();
            }
            return count;
      }


      public static int getTotalHostCount(String group) {
            Collection s = getGroupsMatching(group);
            Set hosts = new HashSet();
            for(Iterator i = s.iterator(); i.hasNext();){
                  ConnectionGroup cg = (ConnectionGroup) i.next();
                  hosts.addAll(cg.getInitialHosts());
                  hosts.addAll(cg.getClosedHosts());
            }
            return hosts.size();
      }

      public static long getTotalLogicalConnectionCount(String group) {
            long count = 0;
            Collection s = getGroupsMatching(group);
            for(Iterator i = s.iterator(); i.hasNext();){
                  count += ((ConnectionGroup) i.next()).getTotalLogicalConnectionCount();
            }
            return count;
      }

      public static long getTotalPhysicalConnectionCount(String group) {
            long count = 0;
            Collection s = getGroupsMatching(group);
            for(Iterator i = s.iterator(); i.hasNext();){
                  count += ((ConnectionGroup) i.next()).getTotalPhysicalConnectionCount();
            }
            return count;
      }

      public static long getTotalTransactionCount(String group) {
            long count = 0;
            Collection s = getGroupsMatching(group);
            for(Iterator i = s.iterator(); i.hasNext();){
                  count += ((ConnectionGroup) i.next()).getTotalTransactionCount();
            }
            return count;
      }

      public static void removeHost(String group, String host) throws SQLException {
            removeHost(group, host, false);
      }
      
      public static void removeHost(String group, String host, boolean removeExisting) throws SQLException {
            Collection s = getGroupsMatching(group);
            for(Iterator i = s.iterator(); i.hasNext();){
                  ((ConnectionGroup) i.next()).removeHost(host, removeExisting);
            }
      }
      
      public static String getActiveHostLists(String group) {
            Collection s = getGroupsMatching(group);
            Map hosts = new HashMap();
            for(Iterator i = s.iterator(); i.hasNext();){
                  
                  Collection l = ((ConnectionGroup) i.next()).getInitialHosts();
                  for(Iterator j = l.iterator(); j.hasNext();  ){
                        String host = j.next().toString();
                        Object o = hosts.get(host);
                        if(o == null){
                              o = Integer.valueOf(1);
                        } else {
                              o = Integer.valueOf(((Integer) o).intValue() + 1);
                        }
                        hosts.put(host, o);
                        
                  }
            }
            
            StringBuffer sb = new StringBuffer();
            String sep = "";
            for(Iterator i = hosts.keySet().iterator(); i.hasNext();){
                  String host = i.next().toString();
                  
                  sb.append(sep);
                  sb.append(host);
                  sb.append('(');
                  sb.append(hosts.get(host));
                  sb.append(')');
                  sep = ",";
            }
            return sb.toString();
      }

      public static String getRegisteredConnectionGroups() {
            Collection s = getGroupsMatching(null);
            StringBuffer sb = new StringBuffer();
            String sep = "";
            for(Iterator i = s.iterator(); i.hasNext();){
                  String group = ((ConnectionGroup)i.next()).getGroupName();
                  sb.append(sep);
                  sb.append(group);
                  sep = ",";
            }
            return sb.toString();

      }
      
      
      
}

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