--- old/src/java.corba/share/classes/com/sun/corba/se/impl/transport/CorbaConnectionCacheBase.java 2018-01-30 20:20:39.000000000 -0500 +++ /dev/null 2018-01-30 20:20:39.000000000 -0500 @@ -1,268 +0,0 @@ -/* - * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * This code 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 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ - -package com.sun.corba.se.impl.transport; - -import java.util.Collection; -import java.util.Iterator; - -import com.sun.corba.se.pept.broker.Broker; -import com.sun.corba.se.pept.transport.Connection; -import com.sun.corba.se.pept.transport.ConnectionCache; - -import com.sun.corba.se.spi.logging.CORBALogDomains; -import com.sun.corba.se.spi.orb.ORB; -import com.sun.corba.se.spi.transport.CorbaConnection; -import com.sun.corba.se.spi.transport.CorbaConnectionCache; - -import com.sun.corba.se.impl.logging.ORBUtilSystemException; -import com.sun.corba.se.impl.orbutil.ORBUtility; - -/** - * @author Harold Carr - */ -public abstract class CorbaConnectionCacheBase - implements - ConnectionCache, - CorbaConnectionCache -{ - protected ORB orb; - protected long timestamp = 0; - protected String cacheType; - protected String monitoringName; - protected ORBUtilSystemException wrapper; - - protected CorbaConnectionCacheBase(ORB orb, String cacheType, - String monitoringName) - { - this.orb = orb; - this.cacheType = cacheType; - this.monitoringName = monitoringName; - wrapper =ORBUtilSystemException.get(orb,CORBALogDomains.RPC_TRANSPORT); - registerWithMonitoring(); - dprintCreation(); - } - - //////////////////////////////////////////////////// - // - // pept.transport.ConnectionCache - // - - public String getCacheType() - { - return cacheType; - } - - public synchronized void stampTime(Connection c) - { - // _REVISIT_ Need to worry about wrap around some day - c.setTimeStamp(timestamp++); - } - - public long numberOfConnections() - { - synchronized (backingStore()) { - return values().size(); - } - } - - public void close() { - synchronized (backingStore()) { - for (Object obj : values()) { - ((CorbaConnection)obj).closeConnectionResources() ; - } - } - } - - public long numberOfIdleConnections() - { - long count = 0; - synchronized (backingStore()) { - Iterator connections = values().iterator(); - while (connections.hasNext()) { - if (! ((Connection)connections.next()).isBusy()) { - count++; - } - } - } - return count; - } - - public long numberOfBusyConnections() - { - long count = 0; - synchronized (backingStore()) { - Iterator connections = values().iterator(); - while (connections.hasNext()) { - if (((Connection)connections.next()).isBusy()) { - count++; - } - } - } - return count; - } - - /** - * Discarding least recently used Connections that are not busy - * - * This method must be synchronized since one WorkerThread could - * be reclaming connections inside the synchronized backingStore - * block and a second WorkerThread (or a SelectorThread) could have - * already executed the if (numberOfConnections {@literal <=} .... ). As a - * result the second thread would also attempt to reclaim connections. - * - * If connection reclamation becomes a performance issue, the connection - * reclamation could make its own task and consequently executed in - * a separate thread. - * Currently, the accept {@literal &} reclaim are done in the same thread, WorkerThread - * by default. It could be changed such that the SelectorThread would do - * it for SocketChannels and WorkerThreads for Sockets by updating the - * ParserTable. - */ - synchronized public boolean reclaim() - { - try { - long numberOfConnections = numberOfConnections(); - - if (orb.transportDebugFlag) { - dprint(".reclaim->: " + numberOfConnections - + " (" - + orb.getORBData().getHighWaterMark() - + "/" - + orb.getORBData().getLowWaterMark() - + "/" - + orb.getORBData().getNumberToReclaim() - + ")"); - } - - if (numberOfConnections <= orb.getORBData().getHighWaterMark() || - numberOfConnections < orb.getORBData().getLowWaterMark()) { - return false; - } - - Object backingStore = backingStore(); - synchronized (backingStore) { - - // REVISIT - A less expensive alternative connection reclaiming - // algorithm could be investigated. - - for (int i=0; i < orb.getORBData().getNumberToReclaim(); i++) { - Connection toClose = null; - long lru = java.lang.Long.MAX_VALUE; - Iterator iterator = values().iterator(); - - // Find least recently used and not busy connection in cache - while ( iterator.hasNext() ) { - Connection c = (Connection) iterator.next(); - if ( !c.isBusy() && c.getTimeStamp() < lru ) { - toClose = c; - lru = c.getTimeStamp(); - } - } - - if ( toClose == null ) { - return false; - } - - try { - if (orb.transportDebugFlag) { - dprint(".reclaim: closing: " + toClose); - } - toClose.close(); - } catch (Exception ex) { - // REVISIT - log - } - } - - if (orb.transportDebugFlag) { - dprint(".reclaim: connections reclaimed (" - + (numberOfConnections - numberOfConnections()) + ")"); - } - } - - // XXX is necessary to do a GC to reclaim - // closed network connections ?? - // java.lang.System.gc(); - - return true; - } finally { - if (orb.transportDebugFlag) { - dprint(".reclaim<-: " + numberOfConnections()); - } - } - } - - //////////////////////////////////////////////////// - // - // spi.transport.ConnectionCache - // - - public String getMonitoringName() - { - return monitoringName; - } - - //////////////////////////////////////////////////// - // - // Implementation - // - - // This is public so folb.Server test can access it. - public abstract Collection values(); - - protected abstract Object backingStore(); - - protected abstract void registerWithMonitoring(); - - protected void dprintCreation() - { - if (orb.transportDebugFlag) { - dprint(".constructor: cacheType: " + getCacheType() - + " monitoringName: " + getMonitoringName()); - } - } - - protected void dprintStatistics() - { - if (orb.transportDebugFlag) { - dprint(".stats: " - + numberOfConnections() + "/total " - + numberOfBusyConnections() + "/busy " - + numberOfIdleConnections() + "/idle" - + " (" - + orb.getORBData().getHighWaterMark() + "/" - + orb.getORBData().getLowWaterMark() + "/" - + orb.getORBData().getNumberToReclaim() - + ")"); - } - } - - protected void dprint(String msg) - { - ORBUtility.dprint("CorbaConnectionCacheBase", msg); - } -} - -// End of file.