Source Code Cross Referenced for LinkedJavaProcess.java in  » Net » Terracotta » com » tc » process » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Net » Terracotta » com.tc.process 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * All content copyright (c) 2003-2006 Terracotta, Inc., except as may otherwise be noted in a separate copyright
003:         * notice. All rights reserved.
004:         */
005:        package com.tc.process;
006:
007:        import com.tc.util.Assert;
008:        import com.tc.util.runtime.Os;
009:
010:        import java.io.File;
011:        import java.io.IOException;
012:        import java.io.InputStream;
013:        import java.io.OutputStream;
014:        import java.util.ArrayList;
015:        import java.util.Arrays;
016:        import java.util.Collections;
017:        import java.util.HashMap;
018:        import java.util.Iterator;
019:        import java.util.LinkedList;
020:        import java.util.List;
021:        import java.util.Map;
022:
023:        /**
024:         * A child Java process that uses a socket-based ping protocol to make sure that if the parent dies, the child dies a
025:         * short time thereafter. Useful for avoiding 'zombie child processes' when writing tests, etc. — otherwise, if
026:         * the parent process crashes or otherwise terminates abnormally, you'll get child processes accumulating until all hell
027:         * breaks loose on the box.
028:         * </p>
029:         * <p>
030:         * Although it can't actually be related through Java inheritance (because {@link Process}is a class, not an
031:         * interface), this class behaves essentially identical to {@link Process}with two differences:
032:         * <ul>
033:         * <li>You instantiate this class directly, rather than getting an instance from {@link Runtime#exec}.</li>
034:         * <li>The process doesn't start until you call {@link #start}.</li>
035:         * </ul>
036:         */
037:        public class LinkedJavaProcess {
038:
039:            private File javaHome;
040:            private final String mainClassName;
041:            private String[] javaArguments;
042:            private final String[] arguments;
043:            private String[] environment;
044:            private File directory;
045:            private File javaExecutable;
046:
047:            private Process process;
048:            private boolean running;
049:            private final List copiers = Collections
050:                    .synchronizedList(new ArrayList());
051:
052:            public LinkedJavaProcess(String mainClassName,
053:                    String[] classArguments) {
054:                Assert.assertNotBlank(mainClassName);
055:
056:                if (classArguments == null)
057:                    classArguments = new String[0];
058:
059:                this .mainClassName = mainClassName;
060:                this .javaArguments = null;
061:                this .arguments = classArguments;
062:                this .environment = null;
063:                this .directory = null;
064:                this .javaExecutable = null;
065:                this .process = null;
066:                this .running = false;
067:            }
068:
069:            public File getJavaHome() {
070:                return javaHome;
071:            }
072:
073:            public void setJavaHome(File javaHome) {
074:                this .javaHome = javaHome;
075:            }
076:
077:            public LinkedJavaProcess(String mainClassName) {
078:                this (mainClassName, null);
079:            }
080:
081:            public void setJavaExecutable(File javaExecutable) {
082:                Assert.assertNotNull(javaExecutable);
083:
084:                this .javaExecutable = javaExecutable;
085:            }
086:
087:            public void setJavaArguments(String[] javaArguments) {
088:                this .javaArguments = javaArguments;
089:            }
090:
091:            public void setEnvironment(String[] environment) {
092:                this .environment = environment;
093:            }
094:
095:            public void setDirectory(File directory) {
096:                this .directory = directory;
097:            }
098:
099:            public synchronized void destroy() {
100:                if (!this .running)
101:                    throw new IllegalStateException(
102:                            "This LinkedJavaProcess is not running.");
103:                this .process.destroy();
104:                this .running = false;
105:            }
106:
107:            private synchronized void setJavaExecutableIfNecessary()
108:                    throws IOException {
109:                if (this .javaExecutable == null) {
110:                    if (javaHome == null) {
111:                        javaHome = new File(System.getProperty("java.home"));
112:                    }
113:
114:                    File javaBin = new File(javaHome, "bin");
115:                    File javaPlain = new File(javaBin, "java");
116:                    File javaExe = new File(javaBin, "java.exe");
117:
118:                    if (this .javaExecutable == null) {
119:                        if (javaPlain.exists() && javaPlain.isFile())
120:                            this .javaExecutable = javaPlain;
121:                    }
122:
123:                    if (this .javaExecutable == null) {
124:                        if (javaExe.exists() && javaExe.isFile())
125:                            this .javaExecutable = javaExe;
126:                    }
127:
128:                    if (this .javaExecutable == null) {
129:                        // formatting
130:                        throw new IOException(
131:                                "Can't find the Java binary; perhaps you need to set it yourself? Tried "
132:                                        + javaPlain.getAbsolutePath() + " and "
133:                                        + javaExe.getAbsolutePath());
134:                    }
135:                }
136:            }
137:
138:            public synchronized void start() throws IOException {
139:                if (this .running)
140:                    throw new IllegalStateException(
141:                            "This LinkedJavaProcess is already running.");
142:
143:                HeartBeatService.startHeartBeatService();
144:
145:                List fullCommandList = new LinkedList();
146:                List allJavaArguments = new ArrayList();
147:
148:                allJavaArguments.add("-Djava.class.path="
149:                        + System.getProperty("java.class.path"));
150:                allJavaArguments.add("-Dcom.tc.l1.modules.repositories="
151:                        + System.getProperty("com.tc.l1.modules.repositories"));
152:                if (this .javaArguments != null)
153:                    allJavaArguments.addAll(Arrays.asList(this .javaArguments));
154:
155:                setJavaExecutableIfNecessary();
156:
157:                int socketPort = HeartBeatService.listenPort();
158:
159:                Map env = makeEnvMap(Arrays
160:                        .asList(this .environment == null ? new String[] {}
161:                                : this .environment));
162:                fixupEnvironment(env);
163:
164:                fullCommandList.add(this .javaExecutable.getAbsolutePath());
165:                fullCommandList.addAll(allJavaArguments);
166:                fullCommandList.add(LinkedJavaProcessStarter.class.getName());
167:                fullCommandList.add(Integer.toString(socketPort));
168:                fullCommandList.add(this .mainClassName);
169:                if (this .arguments != null)
170:                    fullCommandList.addAll(Arrays.asList(this .arguments));
171:
172:                String[] fullCommand = (String[]) fullCommandList
173:                        .toArray(new String[fullCommandList.size()]);
174:
175:                this .process = Runtime.getRuntime().exec(fullCommand,
176:                        makeEnv(env), this .directory);
177:                this .running = true;
178:            }
179:
180:            private Map makeEnvMap(List list) {
181:                Map rv = new HashMap();
182:
183:                for (Iterator iter = list.iterator(); iter.hasNext();) {
184:                    String[] nameValue = ((String) iter.next()).split("=", 2);
185:                    rv.put(nameValue[0], nameValue[1]);
186:                }
187:
188:                return rv;
189:            }
190:
191:            private String[] makeEnv(Map env) {
192:                int i = 0;
193:                String[] rv = new String[env.size()];
194:                for (Iterator iter = env.keySet().iterator(); iter.hasNext(); i++) {
195:                    String key = (String) iter.next();
196:                    rv[i] = key + "=" + env.get(key);
197:                }
198:                return rv;
199:            }
200:
201:            private static void fixupEnvironment(Map env) {
202:                if (Os.isWindows()) {
203:                    // A bunch of name lookup stuff will fail w/o setting SYSTEMROOT. Also, if
204:                    // you have apple's rendevous/bonjour
205:                    // client installed, it needs to be in the PATH such that dnssd.dll will
206:                    // be found when using DNS
207:
208:                    if (!env.containsKey("SYSTEMROOT")) {
209:                        String root = Os.findWindowsSystemRoot();
210:                        if (root == null) {
211:                            throw new RuntimeException(
212:                                    "cannot find %SYSTEMROOT% in the environment");
213:                        }
214:                        env.put("SYSTEMROOT", root);
215:                    }
216:
217:                    String crappleDirs = "C:\\Program Files\\Rendezvous\\"
218:                            + File.pathSeparator
219:                            + "C:\\Program Files\\Bonjour\\";
220:
221:                    if (!env.containsKey("PATH")) {
222:                        env.put("PATH", crappleDirs);
223:                    } else {
224:                        String path = (String) env.get("PATH");
225:                        path = path + File.pathSeparator + crappleDirs;
226:                        env.put("PATH", path);
227:                    }
228:                }
229:            }
230:
231:            /**
232:             * Java names these things a bit funny &mdash; this is the spawned process's <tt>stdout</tt>.
233:             */
234:            public synchronized InputStream getInputStream() {
235:                if (!this .running)
236:                    throw new IllegalStateException(
237:                            "This LinkedJavaProcess is not yet running.");
238:                return this .process.getInputStream();
239:            }
240:
241:            public InputStream STDOUT() {
242:                return getInputStream();
243:            }
244:
245:            public OutputStream STDIN() {
246:                return getOutputStream();
247:            }
248:
249:            public InputStream STDERR() {
250:                return getErrorStream();
251:            }
252:
253:            public void mergeSTDOUT() {
254:                mergeSTDOUT(null);
255:            }
256:
257:            public void mergeSTDOUT(String identifier) {
258:                mergeStream(STDOUT(), System.out, identifier);
259:            }
260:
261:            public void mergeSTDERR() {
262:                mergeSTDERR(null);
263:            }
264:
265:            public void mergeSTDERR(String identifier) {
266:                mergeStream(STDERR(), System.err, identifier);
267:            }
268:
269:            private void mergeStream(InputStream in, OutputStream out,
270:                    String identifier) {
271:                StreamCopier copier = new StreamCopier(in, out, identifier);
272:                copiers.add(copier);
273:                copier.start();
274:            }
275:
276:            /**
277:             * This is the spawned process's <tt>stderr</tt>.
278:             */
279:            public synchronized InputStream getErrorStream() {
280:                if (!this .running)
281:                    throw new IllegalStateException(
282:                            "This LinkedJavaProcess is not yet running.");
283:                return this .process.getErrorStream();
284:            }
285:
286:            /**
287:             * Java names these things a bit funny &mdash; this is the spawned process's <tt>stdin</tt>.
288:             */
289:            public synchronized OutputStream getOutputStream() {
290:                if (!this .running)
291:                    throw new IllegalStateException(
292:                            "This LinkedJavaProcess is not yet running.");
293:                return this .process.getOutputStream();
294:            }
295:
296:            public synchronized int exitValue() {
297:                if (this .process == null)
298:                    throw new IllegalStateException(
299:                            "This LinkedJavaProcess has not been started.");
300:                int out = this .process.exitValue();
301:                // Process.exitValue() throws an exception if not yet terminated, so we know
302:                // it's terminated now.
303:                this .running = false;
304:                return out;
305:            }
306:
307:            public int waitFor() throws InterruptedException {
308:                Process theProcess = null;
309:
310:                synchronized (this ) {
311:                    if (!this .running)
312:                        throw new IllegalStateException(
313:                                "This LinkedJavaProcess is not running.");
314:                    theProcess = this .process;
315:                    Assert.assertNotNull(theProcess);
316:                }
317:
318:                int exitCode = theProcess.waitFor();
319:
320:                for (Iterator i = copiers.iterator(); i.hasNext();) {
321:                    Thread t = (Thread) i.next();
322:                    t.join();
323:                    i.remove();
324:                }
325:
326:                synchronized (this ) {
327:                    this .running = false;
328:                }
329:
330:                return exitCode;
331:
332:            }
333:
334:        }
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