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Source Code for Connector/J 8.0.31 - User Impl
Where to get the Java source code for Connector/J 8.0 User Impl module?
✍: FYIcenter.com
Java source code files for Connector/J 8.0 User Impl module are:
⏎ com/mysql/cj/jdbc/ha/SequentialBalanceStrategy.java
/* * Copyright (c) 2007, 2020, Oracle and/or its affiliates. * * This program is free software; you can redistribute it and/or modify it under * the terms of the GNU General Public License, version 2.0, as published by the * Free Software Foundation. * * This program is also distributed with certain software (including but not * limited to OpenSSL) that is licensed under separate terms, as designated in a * particular file or component or in included license documentation. The * authors of MySQL hereby grant you an additional permission to link the * program and your derivative works with the separately licensed software that * they have included with MySQL. * * Without limiting anything contained in the foregoing, this file, which is * part of MySQL Connector/J, is also subject to the Universal FOSS Exception, * version 1.0, a copy of which can be found at * http://oss.oracle.com/licenses/universal-foss-exception. * * 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, version 2.0, * 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.cj.jdbc.ha; import java.lang.reflect.InvocationHandler; import java.sql.SQLException; import java.util.List; import java.util.Map; import com.mysql.cj.jdbc.ConnectionImpl; import com.mysql.cj.jdbc.JdbcConnection; /** * A balancing strategy that starts at a random point, and then advances in the list (wrapping around) for each new pickConnection() call. * * The initial point selection, and subsequent point selections are blocklist-aware. */ public class SequentialBalanceStrategy implements BalanceStrategy { private int currentHostIndex = -1; public SequentialBalanceStrategy() { } @Override public ConnectionImpl pickConnection(InvocationHandler proxy, List<String> configuredHosts, Map<String, JdbcConnection> liveConnections, long[] responseTimes, int numRetries) throws SQLException { int numHosts = configuredHosts.size(); SQLException ex = null; Map<String, Long> blockList = ((LoadBalancedConnectionProxy) proxy).getGlobalBlocklist(); for (int attempts = 0; attempts < numRetries; attempts++) { if (numHosts == 1) { this.currentHostIndex = 0; // pathological case } else if (this.currentHostIndex == -1) { int random = (int) Math.floor((Math.random() * numHosts)); for (int i = random; i < numHosts; i++) { if (!blockList.containsKey(configuredHosts.get(i))) { this.currentHostIndex = i; break; } } if (this.currentHostIndex == -1) { for (int i = 0; i < random; i++) { if (!blockList.containsKey(configuredHosts.get(i))) { this.currentHostIndex = i; break; } } } if (this.currentHostIndex == -1) { blockList = ((LoadBalancedConnectionProxy) proxy).getGlobalBlocklist(); // it may have changed // and the proxy returns a copy try { Thread.sleep(250); } catch (InterruptedException e) { } continue; // retry } } else { int i = this.currentHostIndex + 1; boolean foundGoodHost = false; for (; i < numHosts; i++) { if (!blockList.containsKey(configuredHosts.get(i))) { this.currentHostIndex = i; foundGoodHost = true; break; } } if (!foundGoodHost) { for (i = 0; i < this.currentHostIndex; i++) { if (!blockList.containsKey(configuredHosts.get(i))) { this.currentHostIndex = i; foundGoodHost = true; break; } } } if (!foundGoodHost) { blockList = ((LoadBalancedConnectionProxy) proxy).getGlobalBlocklist(); // it may have changed // and the proxy returns a copy try { Thread.sleep(250); } catch (InterruptedException e) { } continue; // retry } } String hostPortSpec = configuredHosts.get(this.currentHostIndex); ConnectionImpl conn = (ConnectionImpl) liveConnections.get(hostPortSpec); if (conn == null) { try { conn = ((LoadBalancedConnectionProxy) proxy).createConnectionForHost(hostPortSpec); } catch (SQLException sqlEx) { ex = sqlEx; if (((LoadBalancedConnectionProxy) proxy).shouldExceptionTriggerConnectionSwitch(sqlEx)) { ((LoadBalancedConnectionProxy) proxy).addToGlobalBlocklist(hostPortSpec); try { Thread.sleep(250); } catch (InterruptedException e) { } continue; } throw sqlEx; } } return conn; } if (ex != null) { throw ex; } return null; // we won't get here, compiler can't tell } }
⏎ com/mysql/cj/jdbc/ha/SequentialBalanceStrategy.java
Or download all of them as a single archive file:
File name: mysql-connector-java-user-impl-8.0.31.zip File size: 429580 bytes Release date: 2022-09-03 Download
⇒ Downloading mysql-connector-java-5.1.40.zip
⇐ Source Code for Connector/J 8.0.31 - User API
2023-05-09, 7659👍, 0💬
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