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/*
 * Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.sessions.server;

import org.eclipse.persistence.internal.databaseaccess.*;
import org.eclipse.persistence.logging.SessionLog;
import org.eclipse.persistence.sessions.Login;
import org.eclipse.persistence.exceptions.*;

/**
 * 

* Purpose: This subclass is intended to be used with external connection pools. * For these pools, TopLink does not control the pooling behavior. * The login should have the usesExternalConnectionPooling set to "true". */ public class ExternalConnectionPool extends ConnectionPool { protected Accessor cachedConnection; /** * PUBLIC: * Build a new external connection pool. The JDBC driver is responsible for pooling the connections. */ public ExternalConnectionPool() { super(); } /** * PUBLIC: * Build a new external connection pool. The JDBC driver is responsible for pooling the connections. */ public ExternalConnectionPool(String name, Login login, ServerSession owner) { super(name, login, 0, 0, 0, owner); } /** * INTERNAL: * When we acquire a connection from an ExternalConnectionPool we build * a new connection (retrieve it from the external pool). */ public Accessor acquireConnection() throws ConcurrencyException { // Check for dead database and fail-over. if (this.isDead) { return failover(); } Accessor connection = (Accessor)this.cachedConnection.clone(); if (this.owner.shouldLog(SessionLog.FINEST, SessionLog.CONNECTION)) { Object[] args = new Object[1]; args[0] = this.name; this.owner.log(SessionLog.FINEST, SessionLog.CONNECTION, "acquire_connection", args, connection); } return connection; } /** * INTERNAL: * Return the currently cached connection to the external connection pool * @return org.eclipse.persistence.internal.databaseaccess.Accessor */ protected Accessor getCachedConnection() { return cachedConnection; } /** * INTERNAL: * Assume true as the driver is responsible for blocking. */ public boolean hasConnectionAvailable() { return true; } /** * INTERNAL: * Checks for a conflict between pool's type and pool's login */ public boolean isThereConflictBetweenLoginAndType() { return !getLogin().shouldUseExternalConnectionPooling(); } /** * INTERNAL: * When you release an external connection, you simply let it go. */ public void releaseConnection(Accessor connection) throws DatabaseException { if (this.owner.shouldLog(SessionLog.FINEST, SessionLog.CONNECTION)) { Object[] args = new Object[1]; args[0] = this.name; this.owner.log(SessionLog.FINEST, SessionLog.CONNECTION, "release_connection", args, connection); } if (!this.failoverConnectionPools.isEmpty()) { if (!connection.isValid()) { if (this.checkConnections) { // If 2nd dead connection, then assume dead. this.isDead = true; } else { this.checkConnections = true; } } else { this.checkConnections = false; } } connection.closeConnection(); connection.releaseCustomizer(); } /** * Set the currently cached connection to the external connection pool. * @param cachedConnection */ protected void setCachedConnection(Accessor cachedConnection) { this.cachedConnection = cachedConnection; } /** * INTERNAL: * This method is called to indicate that all available connections should be checked. * Noop on external connection pool. */ public void setCheckConnections() { } /** * INTERNAL: * This mehtod is a no-op for external pools. */ public synchronized void shutDown() { //do nothing setIsConnected(false); } /** * INTERNAL: * Build the default connection. * This validates that connect will work and sets up the parent accessor to clone. */ public synchronized void startUp() { setCachedConnection(buildConnection()); setIsConnected(true); } }





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