001 /*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019
020 package org.crsh.processor.term;
021
022 import org.crsh.shell.ShellProcess;
023 import org.crsh.shell.ShellProcessContext;
024 import org.crsh.shell.ShellResponse;
025 import org.crsh.text.Chunk;
026 import org.crsh.term.TermEvent;
027 import org.crsh.text.Text;
028 import org.crsh.util.Safe;
029
030 import java.io.IOException;
031 import java.util.logging.Level;
032
033 class ProcessContext implements ShellProcessContext, Runnable {
034
035 /** . */
036 final Processor processor;
037
038 /** . */
039 final ShellProcess process;
040
041 ProcessContext(Processor processor, ShellProcess process) {
042 this.process = process;
043 this.processor = processor;
044 }
045
046 public boolean takeAlternateBuffer() throws IOException {
047 return processor.term.takeAlternateBuffer();
048 }
049
050 public boolean releaseAlternateBuffer() throws IOException {
051 return processor.term.releaseAlternateBuffer();
052 }
053
054 public void run() {
055 process.execute(this);
056 }
057
058 public int getWidth() {
059 return processor.term.getWidth();
060 }
061
062 public int getHeight() {
063 return processor.term.getHeight();
064 }
065
066 public String getProperty(String name) {
067 return processor.term.getProperty(name);
068 }
069
070 public String readLine(String msg, boolean echo) {
071 try {
072 processor.term.provide(Text.create(msg));
073 processor.term.flush();
074 }
075 catch (IOException e) {
076 return null;
077 }
078 boolean done = false;
079 while (true) {
080 synchronized (processor.lock) {
081 switch (processor.status) {
082 case CLOSED:
083 case CANCELLING:
084 return null;
085 case PROCESSING:
086 if (processor.queue.size() > 0) {
087 TermEvent event = processor.queue.removeFirst();
088 if (event instanceof TermEvent.ReadLine) {
089 return ((TermEvent.ReadLine)event).getLine().toString();
090 }
091 }
092 break;
093 default:
094 throw new AssertionError("Does not make sense " + processor.status);
095 }
096 }
097 if (done) {
098 return null;
099 } else {
100 done = true;
101 processor.waitingEvent = true;
102 try {
103 processor.term.setEcho(echo);
104 processor.readTerm();
105 processor.term.provide(Text.create("\r\n"));
106 }
107 catch (IOException e) {
108 processor.log.log(Level.SEVERE, "Error when readline line");
109 }
110 finally {
111 processor.waitingEvent = false;
112 processor.term.setEcho(true);
113 }
114 }
115 }
116 }
117
118 public Class<Chunk> getConsumedType() {
119 return Chunk.class;
120 }
121
122 public void provide(Chunk element) throws IOException {
123 processor.term.provide(element);
124 }
125
126 public void flush() throws IOException {
127 processor.term.flush();
128 }
129
130 public void end(ShellResponse response) {
131 Runnable runnable;
132 ProcessContext context;
133 Status status;
134 synchronized (processor.lock) {
135
136 //
137 processor.current = null;
138 switch (processor.status) {
139 case PROCESSING:
140 if (response instanceof ShellResponse.Close) {
141 runnable = processor.CLOSE_TASK;
142 processor.status = Status.CLOSED;
143 } else if (response instanceof ShellResponse.Cancelled) {
144 runnable = Processor.NOOP;
145 processor.status = Status.AVAILABLE;
146 } else {
147 final String message = response.getMessage();
148 runnable = new Runnable() {
149 public void run() {
150 try {
151 processor.provide(Text.create(message));
152 }
153 catch (IOException e) {
154 // todo ???
155 e.printStackTrace();
156 }
157 finally {
158 // Be sure to flush
159 Safe.flush(processor.term);
160 }
161 }
162 };
163 processor.status = Status.AVAILABLE;
164 }
165 break;
166 case CANCELLING:
167 runnable = Processor.NOOP;
168 processor.status = Status.AVAILABLE;
169 break;
170 default:
171 throw new AssertionError("Does not make sense " + processor.status);
172 }
173
174 // Do we have a next process to execute ?
175 context = processor.peekProcess();
176 status = processor.status;
177 }
178
179 //
180 runnable.run();
181
182 //
183 if (context != null) {
184 context.run();
185 } else if (status == Status.AVAILABLE) {
186 processor.writePromptFlush();
187 }
188 }
189 }