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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically
embedded into Java applications to provide scripting to end users.
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript.tests;
import java.io.*;
import junit.framework.TestCase;
import org.mozilla.javascript.ConsString;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Script;
import org.mozilla.javascript.Function;
import org.mozilla.javascript.ContinuationPending;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.WrappedException;
import org.mozilla.javascript.serialize.ScriptableInputStream;
import org.mozilla.javascript.serialize.ScriptableOutputStream;
/**
* Test of new API functions for running and resuming scripts containing
* continuations, and for suspending a continuation from a Java method
* called from JavaScript.
*
* @author Norris Boyd
*/
public class ContinuationsApiTest extends TestCase {
Scriptable globalScope;
public static class MyClass implements Serializable {
private static final long serialVersionUID = 4189002778806232070L;
public int f(int a) {
Context cx = Context.enter();
try {
ContinuationPending pending = cx.captureContinuation();
pending.setApplicationState(a);
throw pending;
} finally {
Context.exit();
}
}
public int g(int a) {
Context cx = Context.enter();
try {
ContinuationPending pending = cx.captureContinuation();
pending.setApplicationState(2*a);
throw pending;
} finally {
Context.exit();
}
}
public String h() {
Context cx = Context.enter();
try {
ContinuationPending pending = cx.captureContinuation();
pending.setApplicationState("2*3");
throw pending;
} finally {
Context.exit();
}
}
}
@Override
public void setUp() {
Context cx = Context.enter();
try {
globalScope = cx.initStandardObjects();
cx.setOptimizationLevel(-1); // must use interpreter mode
globalScope.put("myObject", globalScope,
Context.javaToJS(new MyClass(), globalScope));
} finally {
Context.exit();
}
}
public void testScriptWithContinuations() {
Context cx = Context.enter();
try {
cx.setOptimizationLevel(-1); // must use interpreter mode
Script script = cx.compileString("myObject.f(3) + 1;",
"test source", 1, null);
cx.executeScriptWithContinuations(script, globalScope);
fail("Should throw ContinuationPending");
} catch (ContinuationPending pending) {
Object applicationState = pending.getApplicationState();
assertEquals(new Integer(3), applicationState);
int saved = (Integer) applicationState;
Object result = cx.resumeContinuation(pending.getContinuation(), globalScope, saved + 1);
assertEquals(5, ((Number)result).intValue());
} finally {
Context.exit();
}
}
public void testScriptWithMultipleContinuations() {
Context cx = Context.enter();
try {
cx.setOptimizationLevel(-1); // must use interpreter mode
Script script = cx.compileString(
"myObject.f(3) + myObject.g(3) + 2;",
"test source", 1, null);
cx.executeScriptWithContinuations(script, globalScope);
fail("Should throw ContinuationPending");
} catch (ContinuationPending pending) {
try {
Object applicationState = pending.getApplicationState();
assertEquals(new Integer(3), applicationState);
int saved = (Integer) applicationState;
cx.resumeContinuation(pending.getContinuation(), globalScope, saved + 1);
fail("Should throw another ContinuationPending");
} catch (ContinuationPending pending2) {
Object applicationState2 = pending2.getApplicationState();
assertEquals(new Integer(6), applicationState2);
int saved2 = (Integer) applicationState2;
Object result2 = cx.resumeContinuation(pending2.getContinuation(), globalScope, saved2 + 1);
assertEquals(13, ((Number)result2).intValue());
}
} finally {
Context.exit();
}
}
public void testScriptWithNestedContinuations() {
Context cx = Context.enter();
try {
cx.setOptimizationLevel(-1); // must use interpreter mode
Script script = cx.compileString("myObject.g( myObject.f(1) ) + 2;",
"test source", 1, null);
cx.executeScriptWithContinuations(script, globalScope);
fail("Should throw ContinuationPending");
} catch (ContinuationPending pending) {
try {
Object applicationState = pending.getApplicationState();
assertEquals(new Integer(1), applicationState);
int saved = (Integer) applicationState;
cx.resumeContinuation(pending.getContinuation(), globalScope, saved + 1);
fail("Should throw another ContinuationPending");
} catch (ContinuationPending pending2) {
Object applicationState2 = pending2.getApplicationState();
assertEquals(new Integer(4), applicationState2);
int saved2 = (Integer) applicationState2;
Object result2 = cx.resumeContinuation(pending2.getContinuation(), globalScope, saved2 + 2);
assertEquals(8, ((Number)result2).intValue());
}
} finally {
Context.exit();
}
}
public void testFunctionWithContinuations() {
Context cx = Context.enter();
try {
cx.setOptimizationLevel(-1); // must use interpreter mode
cx.evaluateString(globalScope,
"function f(a) { return myObject.f(a); }",
"function test source", 1, null);
Function f = (Function) globalScope.get("f", globalScope);
Object[] args = { 7 };
cx.callFunctionWithContinuations(f, globalScope, args);
fail("Should throw ContinuationPending");
} catch (ContinuationPending pending) {
Object applicationState = pending.getApplicationState();
assertEquals(7, ((Number)applicationState).intValue());
int saved = (Integer) applicationState;
Object result = cx.resumeContinuation(pending.getContinuation(), globalScope, saved + 1);
assertEquals(8, ((Number)result).intValue());
} finally {
Context.exit();
}
}
/**
* Since a continuation can only capture JavaScript frames and not Java
* frames, ensure that Rhino throws an exception when the JavaScript frames
* don't reach all the way to the code called by
* executeScriptWithContinuations or callFunctionWithContinuations.
*/
public void testErrorOnEvalCall() {
Context cx = Context.enter();
try {
cx.setOptimizationLevel(-1); // must use interpreter mode
Script script = cx.compileString("eval('myObject.f(3);');",
"test source", 1, null);
cx.executeScriptWithContinuations(script, globalScope);
fail("Should throw IllegalStateException");
} catch (WrappedException we) {
Throwable t = we.getWrappedException();
assertTrue(t instanceof IllegalStateException);
assertTrue(t.getMessage().startsWith("Cannot capture continuation"));
} finally {
Context.exit();
}
}
public void testSerializationWithContinuations()
throws IOException, ClassNotFoundException
{
Context cx = Context.enter();
try {
cx.setOptimizationLevel(-1); // must use interpreter mode
cx.evaluateString(globalScope,
"function f(a) { var k = myObject.f(a); var t = []; return k; }",
"function test source", 1, null);
Function f = (Function) globalScope.get("f", globalScope);
Object[] args = { 7 };
cx.callFunctionWithContinuations(f, globalScope, args);
fail("Should throw ContinuationPending");
} catch (ContinuationPending pending) {
// serialize
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ScriptableOutputStream sos = new ScriptableOutputStream(baos, globalScope);
sos.writeObject(globalScope);
sos.writeObject(pending.getContinuation());
sos.close();
baos.close();
byte[] serializedData = baos.toByteArray();
// deserialize
ByteArrayInputStream bais = new ByteArrayInputStream(serializedData);
ScriptableInputStream sis = new ScriptableInputStream(bais, globalScope);
globalScope = (Scriptable) sis.readObject();
Object continuation = sis.readObject();
sis.close();
bais.close();
Object result = cx.resumeContinuation(continuation, globalScope, 8);
assertEquals(8, ((Number)result).intValue());
} finally {
Context.exit();
}
}
public void testContinuationsPrototypesAndSerialization() throws IOException, ClassNotFoundException {
byte[] serializedData = null;
{
Scriptable globalScope;
Context cx = Context.enter();
try {
globalScope = cx.initStandardObjects();
cx.setOptimizationLevel(-1); // must use interpreter mode
globalScope.put("myObject", globalScope, Context.javaToJS(new MyClass(), globalScope));
} finally {
Context.exit();
}
cx = Context.enter();
try {
cx.setOptimizationLevel(-1); // must use interpreter mode
cx.evaluateString(
globalScope,
"function f(a) { Number.prototype.blargh = function() {return 'foo';}; var k = myObject.f(a); var t = []; return new Number(8).blargh(); }",
"function test source", 1, null);
Function f = (Function) globalScope.get("f", globalScope);
Object[] args = { 7 };
cx.callFunctionWithContinuations(f, globalScope, args);
fail("Should throw ContinuationPending");
} catch (ContinuationPending pending) {
// serialize
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream sos = new ObjectOutputStream(baos);
sos.writeObject(globalScope);
sos.writeObject(pending.getContinuation());
sos.close();
baos.close();
serializedData = baos.toByteArray();
} finally {
Context.exit();
}
}
{
try {
Context cx = Context.enter();
Scriptable globalScope;
// deserialize
ByteArrayInputStream bais = new ByteArrayInputStream(serializedData);
ObjectInputStream sis = new ObjectInputStream(bais);
globalScope = (Scriptable) sis.readObject();
Object continuation = sis.readObject();
sis.close();
bais.close();
Object result = cx.resumeContinuation(continuation, globalScope, 8);
assertEquals("foo", result);
} finally {
Context.exit();
}
}
}
public void testContinuationsInlineFunctionsSerialization() throws IOException, ClassNotFoundException {
Scriptable globalScope;
Context cx = Context.enter();
try {
globalScope = cx.initStandardObjects();
cx.setOptimizationLevel(-1); // must use interpreter mode
globalScope.put("myObject", globalScope, Context.javaToJS(new MyClass(), globalScope));
} finally {
Context.exit();
}
cx = Context.enter();
try {
cx.setOptimizationLevel(-1); // must use interpreter mode
cx.evaluateString(globalScope, "function f(a) { var k = eval(myObject.h()); var t = []; return k; }",
"function test source", 1, null);
Function f = (Function) globalScope.get("f", globalScope);
Object[] args = { 7 };
cx.callFunctionWithContinuations(f, globalScope, args);
fail("Should throw ContinuationPending");
} catch (ContinuationPending pending) {
// serialize
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ScriptableOutputStream sos = new ScriptableOutputStream(baos, globalScope);
sos.writeObject(globalScope);
sos.writeObject(pending.getContinuation());
sos.close();
baos.close();
byte[] serializedData = baos.toByteArray();
// deserialize
ByteArrayInputStream bais = new ByteArrayInputStream(serializedData);
ScriptableInputStream sis = new ScriptableInputStream(bais, globalScope);
globalScope = (Scriptable) sis.readObject();
Object continuation = sis.readObject();
sis.close();
bais.close();
Object result = cx.resumeContinuation(continuation, globalScope, "2+3");
assertEquals(5, ((Number) result).intValue());
} finally {
Context.exit();
}
}
public void testConsStringSerialization() throws IOException, ClassNotFoundException {
ConsString r1 = new ConsString("foo", "bar");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(baos);
oos.writeObject(r1);
oos.flush();
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bais);
CharSequence r2 = (CharSequence) ois.readObject();
assertEquals("still the same at the other end", r1.toString(), r2.toString());
}
}
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