import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.StringReader;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
/**
* Create and run THREAD_COUNT PHP threads, concurrently accessing a
* shared resource.
*
* Create 5 script engines, passing each a shared resource allocated
* from Java. Each script engine has to implement Runnable.
*
* Java accesses the Runnable script engine using
* scriptEngine.getInterface() and calls thread.start() to invoke each
* PHP Runnable implementations concurrently.
*/
public class PhpThreads {
public static final String runnable = new String("<?php\n" +
"function run() {\n" +
" $out = java_context()->getAttribute('sharedResource', 100);\n" +
" $nr = (string)java_context()->getAttribute('nr', 100);\n" +
" echo \"started thread: $nr\n\";\n" +
" for($i=0; $i<100; $i++) {\n" +
" $out->write(ord($nr));\n" +
" java('java.lang.Thread')->sleep(1);\n" +
" }\n" +
"}\n" +
"?>\n");
static final int THREAD_COUNT = 5;
public static void main(String[] args) throws Exception {
ScriptEngineManager manager = new ScriptEngineManager();
Thread threads[] = new Thread[THREAD_COUNT];
ScriptEngine engines[] = new ScriptEngine[THREAD_COUNT];
ByteArrayOutputStream sharedResource = new ByteArrayOutputStream();
StringReader runnableReader = new StringReader(runnable);
// create THREAD_COUNT PHP threads
for (int i=0; i<THREAD_COUNT; i++) {
engines[i] = manager.getEngineByName("php-invocable");
if (engines[i] == null)
throw new NullPointerException ("php script engine not found");
engines[i].put("nr", new Integer(i+1));
engines[i].put("sharedResource", sharedResource);
engines[i].eval(runnableReader);
runnableReader.reset();
// cast the whole script to Runnable; note also getInterface(specificClosure, type)
Runnable r = (Runnable) ((Invocable)engines[i]).getInterface(Runnable.class);
threads[i] = new Thread(r);
}
// run the THREAD_COUNT PHP threads
for (int i=0; i<THREAD_COUNT; i++) {
threads[i].start();
}
// wait for the THREAD_COUNT PHP threads to finish
for (int i=0; i<THREAD_COUNT; i++) {
threads[i].join();
((Closeable)engines[i]).close();
}
// print the output generated by the THREAD_COUNT concurrent threads
String result = sharedResource.toString();
System.out.println(result);
// Check result
Object res=manager.getEngineByName("php").eval(
"<?php " +
"exit((int)('10011002100310041005'!=" +
"@system(\"echo -n "+result+"|sed 's/./&\\\n/g'|sort|uniq -c|tr -d ' \\\n'\")));" +
"?>");
System.exit(((Number)res).intValue());
}
}