/*
 * Copyright 2016-2018 shardingsphere.io.
 * <p>
 * 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.
 * </p>
 */

package io.shardingsphere.proxy.backend.common.jdbc;

import io.shardingsphere.core.routing.router.masterslave.MasterVisitedManager;
import io.shardingsphere.proxy.backend.common.ProxyMode;
import io.shardingsphere.proxy.config.RuleRegistry;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;

/**
 * Connection manager.
 *
 * @author zhaojun
 */
public final class ConnectionManager implements AutoCloseable {
    
    private final Map<String, Connection> dataSourceConnectionMap = new HashMap<>();
    
    private final Collection<Connection> cachedConnections = new LinkedList<>();
    
    /**
     * Get connection of current thread datasource.
     *
     * @param dataSourceName data source name
     * @return connection
     * @throws SQLException SQL exception
     */
    public Connection getConnection(final String dataSourceName) throws SQLException {
        DataSource dataSource = RuleRegistry.getInstance().getDataSourceMap().get(dataSourceName);
        Connection result;
        if (ProxyMode.MEMORY_STRICTLY == RuleRegistry.getInstance().getProxyMode()) {
            result = dataSource.getConnection();
        } else {
            if (!dataSourceConnectionMap.containsKey(dataSourceName)) {
                dataSourceConnectionMap.put(dataSourceName, dataSource.getConnection());
            }
            result = dataSourceConnectionMap.get(dataSourceName);
        }
        cachedConnections.add(result);
        return result;
    }
    
    @Override
    public void close() {
        try {
            for (Connection each : cachedConnections) {
                each.close();
            }
        } catch (final SQLException ignored) {
        }
        MasterVisitedManager.clear();
    }
}

@@ -781,115 +781,29 @@
 oxy.
-backend.common.ProxyMode;%0Aimport io.shardingsphere.proxy.config.RuleRegistry;%0A%0Aimport javax.sql.DataSource;
+config.RuleRegistry;%0A
 %0Aimp
@@ -890,34 +890,8 @@
 on;%0A
-import java.util.HashMap;%0A
 impo
@@ -918,30 +918,8 @@
 ist;
-%0Aimport java.util.Map;
 %0A%0A/*
@@ -1042,98 +1042,8 @@
    %0A
-    private final Map%3CString, Connection%3E dataSourceConnectionMap = new HashMap%3C%3E();%0A    %0A
     
@@ -1412,392 +1412,76 @@
     
-DataSource dataSource = RuleRegistry.getInstance().getDataSourceMap().get(dataSourceName);%0A        Connection result;%0A        if (ProxyMode.MEMORY_STRICTLY == RuleRegistry.getInstance().getProxyMode()) %7B%0A            result = dataSource.getConnection();%0A        %7D else %7B%0A            if (!dataSourceConnectionMap.containsKey(dataSourceName)) %7B%0A                dataSourceConnectionMap.pu
+Connection result = RuleRegistry.getInstance().getDataSourceMap().ge
 t(da
@@ -1496,20 +1496,9 @@
 Name
-, dataSource
+)
 .get
@@ -1513,100 +1513,9 @@
 on()
-);%0A            %7D%0A            result = dataSourceConnectionMap.get(dataSourceName);%0A        %7D
+;
 %0A   

simplify ConnectionManager