/**
* Add a callback to be invoked on shutdown.
*
* @param callback a callback function wrapper
* @param sync whether to invoke the callback synchronously (on the main shutdown thread) or
* asynchronously (on the worker's event loop thread)
*/
public synchronized void addShutdownHook(Scriptable callback, boolean sync) {
List<Callback> hooks = shutdownHooks;
if (hooks == null) {
hooks = shutdownHooks = new ArrayList<Callback>();
}
hooks.add(new Callback(callback, this, sync));
}
/**
* Evaluate an expression from the command line.
*
* @param expr the JavaScript expression to evaluate
* @return the return value
* @throws IOException an I/O related error occurred
* @throws JavaScriptException the script threw an error during compilation or execution
*/
public Object evaluateExpression(String expr) throws IOException, JavaScriptException {
Context cx = contextFactory.enterContext();
cx.setOptimizationLevel(-1);
try {
Object retval;
Repository repository = repositories.get(0);
Scriptable parentScope = mainScope != null ? mainScope : globalScope;
ModuleScope scope = new ModuleScope("<expr>", repository, parentScope, mainWorker);
Resource res = new StringResource("<expr>", expr, 1);
ReloadableScript script = new ReloadableScript(res, this);
retval = mainWorker.evaluateScript(cx, script, scope);
return retval instanceof Wrapper ? ((Wrapper) retval).unwrap() : retval;
} finally {
Context.exit();
}
}