| /* |
| * Copyright (c) 1996, 2003, 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. |
| */ |
| /* |
| * Licensed Materials - Property of IBM |
| * RMI-IIOP v1.0 |
| * Copyright IBM Corp. 1998 1999 All Rights Reserved |
| * |
| */ |
| |
| package com.sun.corba.se.impl.oa.toa; |
| |
| import com.sun.corba.se.impl.orbutil.ORBUtility ; |
| import com.sun.corba.se.spi.orb.ORB ; |
| |
| public final class TransientObjectManager { |
| private ORB orb ; |
| private int maxSize = 128; |
| private Element[] elementArray; |
| private Element freeList; |
| |
| void dprint( String msg ) { |
| ORBUtility.dprint( this, msg ) ; |
| } |
| |
| public TransientObjectManager( ORB orb ) |
| { |
| this.orb = orb ; |
| |
| elementArray = new Element[maxSize]; |
| elementArray[maxSize-1] = new Element(maxSize-1,null); |
| for ( int i=maxSize-2; i>=0; i-- ) |
| elementArray[i] = new Element(i,elementArray[i+1]); |
| freeList = elementArray[0]; |
| } |
| |
| public synchronized byte[] storeServant(java.lang.Object servant, java.lang.Object servantData) |
| { |
| if ( freeList == null ) |
| doubleSize(); |
| |
| Element elem = freeList; |
| freeList = (Element)freeList.servant; |
| |
| byte[] result = elem.getKey(servant, servantData); |
| if (orb.transientObjectManagerDebugFlag) |
| dprint( "storeServant returns key for element " + elem ) ; |
| return result ; |
| } |
| |
| public synchronized java.lang.Object lookupServant(byte transientKey[]) |
| { |
| int index = ORBUtility.bytesToInt(transientKey,0); |
| int counter = ORBUtility.bytesToInt(transientKey,4); |
| |
| if (orb.transientObjectManagerDebugFlag) |
| dprint( "lookupServant called with index=" + index + ", counter=" + counter ) ; |
| |
| if (elementArray[index].counter == counter && |
| elementArray[index].valid ) { |
| if (orb.transientObjectManagerDebugFlag) |
| dprint( "\tcounter is valid" ) ; |
| return elementArray[index].servant; |
| } |
| |
| // servant not found |
| if (orb.transientObjectManagerDebugFlag) |
| dprint( "\tcounter is invalid" ) ; |
| return null; |
| } |
| |
| public synchronized java.lang.Object lookupServantData(byte transientKey[]) |
| { |
| int index = ORBUtility.bytesToInt(transientKey,0); |
| int counter = ORBUtility.bytesToInt(transientKey,4); |
| |
| if (orb.transientObjectManagerDebugFlag) |
| dprint( "lookupServantData called with index=" + index + ", counter=" + counter ) ; |
| |
| if (elementArray[index].counter == counter && |
| elementArray[index].valid ) { |
| if (orb.transientObjectManagerDebugFlag) |
| dprint( "\tcounter is valid" ) ; |
| return elementArray[index].servantData; |
| } |
| |
| // servant not found |
| if (orb.transientObjectManagerDebugFlag) |
| dprint( "\tcounter is invalid" ) ; |
| return null; |
| } |
| |
| public synchronized void deleteServant(byte transientKey[]) |
| { |
| int index = ORBUtility.bytesToInt(transientKey,0); |
| if (orb.transientObjectManagerDebugFlag) |
| dprint( "deleting servant at index=" + index ) ; |
| |
| elementArray[index].delete(freeList); |
| freeList = elementArray[index]; |
| } |
| |
| public synchronized byte[] getKey(java.lang.Object servant) |
| { |
| for ( int i=0; i<maxSize; i++ ) |
| if ( elementArray[i].valid && |
| elementArray[i].servant == servant ) |
| return elementArray[i].toBytes(); |
| |
| // if we come here Object does not exist |
| return null; |
| } |
| |
| private void doubleSize() |
| { |
| // Assume caller is synchronized |
| |
| Element old[] = elementArray; |
| int oldSize = maxSize; |
| maxSize *= 2; |
| elementArray = new Element[maxSize]; |
| |
| for ( int i=0; i<oldSize; i++ ) |
| elementArray[i] = old[i]; |
| |
| elementArray[maxSize-1] = new Element(maxSize-1,null); |
| for ( int i=maxSize-2; i>=oldSize; i-- ) |
| elementArray[i] = new Element(i,elementArray[i+1]); |
| freeList = elementArray[oldSize]; |
| } |
| } |
| |
| |
| final class Element { |
| java.lang.Object servant=null; // also stores "next pointer" in free list |
| java.lang.Object servantData=null; |
| int index=-1; |
| int counter=0; |
| boolean valid=false; // valid=true if this Element contains |
| // a valid servant |
| |
| Element(int i, java.lang.Object next) |
| { |
| servant = next; |
| index = i; |
| } |
| |
| byte[] getKey(java.lang.Object servant, java.lang.Object servantData) |
| { |
| this.servant = servant; |
| this.servantData = servantData; |
| this.valid = true; |
| |
| return toBytes(); |
| } |
| |
| byte[] toBytes() |
| { |
| // Convert the index+counter into an 8-byte (big-endian) key. |
| |
| byte key[] = new byte[8]; |
| ORBUtility.intToBytes(index, key, 0); |
| ORBUtility.intToBytes(counter, key, 4); |
| |
| return key; |
| } |
| |
| void delete(Element freeList) |
| { |
| if ( !valid ) // prevent double deletion |
| return; |
| counter++; |
| servantData = null; |
| valid = false; |
| |
| // add this to freeList |
| servant = freeList; |
| } |
| |
| public String toString() |
| { |
| return "Element[" + index + ", " + counter + "]" ; |
| } |
| } |