Future.java revision 608:7e06bf1dcb09
1/* 2 * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.corba.se.impl.orbutil.closure ; 27 28import com.sun.corba.se.spi.orbutil.closure.Closure ; 29 30public class Future implements Closure { 31 private boolean evaluated ; 32 private Closure closure ; 33 private Object value ; 34 35 public Future( Closure value ) 36 { 37 this.evaluated = false ; 38 this.closure = (Closure)value ; 39 this.value = null ; 40 } 41 42 public synchronized Object evaluate() 43 { 44 if (!evaluated) { 45 evaluated = true ; 46 value = closure.evaluate() ; 47 } 48 49 return value ; 50 } 51} 52