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package org.apache.velocity.test;
import junit.framework.Assert;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
public class RenderVelocityTemplateTest
{
static class RenderVelocityTemplate
{
static
{
try
{
Properties p = new Properties();
p.put("velocimacro.permissions.allow.inline.local.scope", "true");
Velocity.init(p);
}
catch (Exception e)
{
throw new AssertionError("Failed to init Velocity");
}
}
private final VelocityContext velocityContext = new VelocityContext();
private final String template;
public RenderVelocityTemplate(String template)
{
this.template = template;
}
public String getContent()
throws Exception
{
StringWriter stringWriter = new StringWriter();
Velocity.evaluate(velocityContext, stringWriter, "", template);
return stringWriter.toString();
}
}
private static final String templateString = "" + //
"#macro (showhelloworld $foo)\n" + //
"Hello, World\n" + //
"#end\n" + //
"\n" + //
"<html>\n" + //
"<head>\n" + //
"<title>page title</title>\n" + //
"</head>\n" + //
"<body>\n" + //
"<p>This is a test</p>\n" + //
"<p>#showhelloworld ($foo)</p>\n" + //
"</body>\n" + //
"</html>";
public void testMultipleEvals()
throws Exception
{
RenderVelocityTemplate template = new RenderVelocityTemplate(templateString);
String result = null;
for (int i = 0; i < 1000; ++i)
{
result = template.getContent();
// Verify that the original macro invocation has been replaced with its result.
int index = result.indexOf("#showhelloworld");
if (index != -1)
{
throw new AssertionError("Failed to substitute macro:\n" + result);
}
// Verify that the macro did indeed expand.
int indexHW = result.indexOf("<p>Hello, World");
Assert.assertTrue(indexHW >= 0);
// Assert.assertEquals("", result); // enable to show what we really get
}
}
/** Helper class for testMultiThreadMultipleEvals(). */
static class ExceptionHandler
implements Thread.UncaughtExceptionHandler
{
List<Throwable> errors = new ArrayList<>();
@Override
public void uncaughtException(Thread t, Throwable e)
{
errors.add(e);
}
}
/** Helper class for testMultiThreadMultipleEvals(). */
class RunMultipleEvals
extends Thread
{
@Override
public void run()
{
try
{
testMultipleEvals();
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
}
/**
* Spawn multiple threads that concurrently call testMultipleEvals.
*/
public void testMultiThreadMultipleEvals()
throws Throwable
{
int nthreads = 4;
ExceptionHandler eh = new ExceptionHandler();
List<Thread> threads = new ArrayList<>(nthreads);
for (int i = 0; i < nthreads; ++i)
{
Thread t = new RunMultipleEvals();
t.setUncaughtExceptionHandler(eh);
threads.add(t);
}
for (Thread t : threads)
{
t.start();
}
for (Thread t : threads)
{
t.join();
}
if (eh.errors.size() > 0)
{
// Rethrow the first failing exception.
System.out.println("Failed " + eh.errors.size() + " out of " + nthreads + " template evaluations");
throw eh.errors.get(0);
}
}
}
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