Source Code Cross Referenced for Mailbox.java in  » IDE » J » org » armedbear » lisp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE » J » org.armedbear.lisp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Mailbox.java
003:         *
004:         * Copyright (C) 2004 Peter Graves
005:         * $Id: Mailbox.java,v 1.3 2004/09/13 18:10:30 asimon Exp $
006:         *
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License
009:         * as published by the Free Software Foundation; either version 2
010:         * of the License, or (at your option) any later version.
011:         *
012:         * This program is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015:         * GNU General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU General Public License
018:         * along with this program; if not, write to the Free Software
019:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
020:         */
021:
022:        package org.armedbear.lisp;
023:
024:        import java.util.LinkedList;
025:        import java.util.NoSuchElementException;
026:
027:        public final class Mailbox extends LispObject {
028:
029:            private LinkedList box = new LinkedList();
030:
031:            private void send(LispObject o) {
032:                synchronized (this ) {
033:                    box.add(o);
034:                    notifyAll();
035:                }
036:            }
037:
038:            private LispObject read() {
039:                while (box.isEmpty())
040:                    synchronized (this ) {
041:                        try {
042:                            wait();
043:                        } catch (InterruptedException e) {
044:                            throw new RuntimeException(e);
045:                        }
046:                    }
047:                return (LispObject) box.removeFirst();
048:            }
049:
050:            private LispObject peek() {
051:                synchronized (this ) {
052:                    try {
053:                        return (LispObject) box.getFirst();
054:                    } catch (NoSuchElementException e) {
055:                        return NIL;
056:                    }
057:                }
058:            }
059:
060:            private LispObject empty() {
061:                return box.isEmpty() ? T : NIL;
062:            }
063:
064:            public String toString() {
065:                StringBuffer sb = new StringBuffer("#<MAILBOX @ #x");
066:                sb.append(Integer.toHexString(hashCode()));
067:                sb.append(">");
068:                return sb.toString();
069:            }
070:
071:            // ### make-mailbox
072:            private static final Primitive0 MAKE_MAILBOX = new Primitive0(
073:                    "make-mailbox", PACKAGE_EXT, true, "") {
074:                public LispObject execute() throws ConditionThrowable {
075:                    return new Mailbox();
076:                }
077:            };
078:
079:            // ### mailbox-send mailbox object
080:            private static final Primitive2 MAILBOX_SEND = new Primitive2(
081:                    "mailbox-send", PACKAGE_EXT, true, "mailbox object") {
082:                public LispObject execute(LispObject first, LispObject second)
083:                        throws ConditionThrowable {
084:                    if (first instanceof  Mailbox) {
085:                        Mailbox mbox = (Mailbox) first;
086:                        mbox.send(second);
087:                        return T;
088:                    } else
089:                        return signal(new TypeError(first, "Mailbox"));
090:                }
091:            };
092:
093:            // ### mailbox-read mailbox
094:            private static final Primitive1 MAILBOX_READ = new Primitive1(
095:                    "mailbox-read", PACKAGE_EXT, true, "mailbox") {
096:                public LispObject execute(LispObject arg)
097:                        throws ConditionThrowable {
098:                    if (arg instanceof  Mailbox) {
099:                        Mailbox mbox = (Mailbox) arg;
100:                        return mbox.read();
101:                    } else
102:                        return signal(new TypeError(arg, "Mailbox"));
103:                }
104:            };
105:
106:            // ### mailbox-peek mailbox
107:            private static final Primitive1 MAILBOX_PEEK = new Primitive1(
108:                    "mailbox-peek", PACKAGE_EXT, true, "mailbox") {
109:                public LispObject execute(LispObject arg)
110:                        throws ConditionThrowable {
111:                    if (arg instanceof  Mailbox) {
112:                        Mailbox mbox = (Mailbox) arg;
113:                        return mbox.peek();
114:                    } else
115:                        return signal(new TypeError(arg, "Mailbox"));
116:                }
117:            };
118:
119:            // ### mailbox-empty-p mailbox
120:            private static final Primitive1 MAILBOX_EMPTY_P = new Primitive1(
121:                    "mailbox-empty-p", PACKAGE_EXT, true, "mailbox") {
122:                public LispObject execute(LispObject arg)
123:                        throws ConditionThrowable {
124:                    if (arg instanceof  Mailbox) {
125:                        Mailbox mbox = (Mailbox) arg;
126:                        return mbox.empty();
127:                    } else
128:                        return signal(new TypeError(arg, "Mailbox"));
129:                }
130:            };
131:        }
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