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/*
Copyright (c) 2010, 2015, 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 FOSS 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;
public class ConnectionGroup {
private String groupName;
private long connections = 0;
private long activeConnections = 0;
private HashMap<Long, LoadBalancedConnectionProxy> connectionProxies = new HashMap<Long, LoadBalancedConnectionProxy>();
private Set<String> hostList = new HashSet<String>();
private boolean isInitialized = false;
private long closedProxyTotalPhysicalConnections = 0;
private long closedProxyTotalTransactions = 0;
private int activeHosts = 0;
private Set<String> closedHosts = new HashSet<String>();
ConnectionGroup(String groupName) {
this.groupName = groupName;
}
public long registerConnectionProxy(LoadBalancedConnectionProxy proxy, List<String> localHostList) {
long currentConnectionId;
synchronized (this) {
if (!this.isInitialized) {
this.hostList.addAll(localHostList);
this.isInitialized = true;
this.activeHosts = localHostList.size();
}
currentConnectionId = ++this.connections;
this.connectionProxies.put(Long.valueOf(currentConnectionId), proxy);
}
this.activeConnections++;
return currentConnectionId;
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#getGroupName()
*/
public String getGroupName() {
return this.groupName;
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#getInitialHostList()
*/
public Collection<String> getInitialHosts() {
return this.hostList;
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#getActiveHostCount()
*/
public int getActiveHostCount() {
return this.activeHosts;
}
public Collection<String> getClosedHosts() {
return this.closedHosts;
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#getTotalLogicalConnectionCount()
*/
public long getTotalLogicalConnectionCount() {
return this.connections;
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#getActiveLogicalConnectionCount()
*/
public long getActiveLogicalConnectionCount() {
return this.activeConnections;
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#getActivePhysicalConnectionCount()
*/
public long getActivePhysicalConnectionCount() {
long result = 0;
Map<Long, LoadBalancedConnectionProxy> proxyMap = new HashMap<Long, LoadBalancedConnectionProxy>();
synchronized (this.connectionProxies) {
proxyMap.putAll(this.connectionProxies);
}
Iterator<Map.Entry<Long, LoadBalancedConnectionProxy>> i = proxyMap.entrySet().iterator();
while (i.hasNext()) {
LoadBalancedConnectionProxy proxy = i.next().getValue();
result += proxy.getActivePhysicalConnectionCount();
}
return result;
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#getTotalPhysicalConnectionCount()
*/
public long getTotalPhysicalConnectionCount() {
long allConnections = this.closedProxyTotalPhysicalConnections;
Map<Long, LoadBalancedConnectionProxy> proxyMap = new HashMap<Long, LoadBalancedConnectionProxy>();
synchronized (this.connectionProxies) {
proxyMap.putAll(this.connectionProxies);
}
Iterator<Map.Entry<Long, LoadBalancedConnectionProxy>> i = proxyMap.entrySet().iterator();
while (i.hasNext()) {
LoadBalancedConnectionProxy proxy = i.next().getValue();
allConnections += proxy.getTotalPhysicalConnectionCount();
}
return allConnections;
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#getTotalTransactionCount()
*/
public long getTotalTransactionCount() {
// need to account for closed connection proxies
long transactions = this.closedProxyTotalTransactions;
Map<Long, LoadBalancedConnectionProxy> proxyMap = new HashMap<Long, LoadBalancedConnectionProxy>();
synchronized (this.connectionProxies) {
proxyMap.putAll(this.connectionProxies);
}
Iterator<Map.Entry<Long, LoadBalancedConnectionProxy>> i = proxyMap.entrySet().iterator();
while (i.hasNext()) {
LoadBalancedConnectionProxy proxy = i.next().getValue();
transactions += proxy.getTransactionCount();
}
return transactions;
}
public void closeConnectionProxy(LoadBalancedConnectionProxy proxy) {
this.activeConnections--;
this.connectionProxies.remove(Long.valueOf(proxy.getConnectionGroupProxyID()));
this.closedProxyTotalPhysicalConnections += proxy.getTotalPhysicalConnectionCount();
this.closedProxyTotalTransactions += proxy.getTransactionCount();
}
public void removeHost(String host) throws SQLException {
removeHost(host, false);
}
public void removeHost(String host, boolean killExistingConnections) throws SQLException {
this.removeHost(host, killExistingConnections, true);
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#removeHost(java.lang.String, boolean, boolean)
*/
public synchronized void removeHost(String host, boolean killExistingConnections, boolean waitForGracefulFailover) throws SQLException {
if (this.activeHosts == 1) {
throw SQLError.createSQLException("Cannot remove host, only one configured host active.", null);
}
if (this.hostList.remove(host)) {
this.activeHosts--;
} else {
throw SQLError.createSQLException("Host is not configured: " + host, null);
}
if (killExistingConnections) {
// make a local copy to keep synchronization overhead to minimum
Map<Long, LoadBalancedConnectionProxy> proxyMap = new HashMap<Long, LoadBalancedConnectionProxy>();
synchronized (this.connectionProxies) {
proxyMap.putAll(this.connectionProxies);
}
Iterator<Map.Entry<Long, LoadBalancedConnectionProxy>> i = proxyMap.entrySet().iterator();
while (i.hasNext()) {
LoadBalancedConnectionProxy proxy = i.next().getValue();
if (waitForGracefulFailover) {
proxy.removeHostWhenNotInUse(host);
} else {
proxy.removeHost(host);
}
}
}
this.closedHosts.add(host);
}
public void addHost(String host) {
addHost(host, false);
}
/*
* (non-Javadoc)
*
* @see com.mysql.jdbc.ConnectionGroupMBean#addHost(java.lang.String, boolean)
*/
public void addHost(String host, boolean forExisting) {
synchronized (this) {
if (this.hostList.add(host)) {
this.activeHosts++;
}
}
// all new connections will have this host
if (!forExisting) {
return;
}
// make a local copy to keep synchronization overhead to minimum
Map<Long, LoadBalancedConnectionProxy> proxyMap = new HashMap<Long, LoadBalancedConnectionProxy>();
synchronized (this.connectionProxies) {
proxyMap.putAll(this.connectionProxies);
}
Iterator<Map.Entry<Long, LoadBalancedConnectionProxy>> i = proxyMap.entrySet().iterator();
while (i.hasNext()) {
LoadBalancedConnectionProxy proxy = i.next().getValue();
proxy.addHost(host);
}
}
}