У меня есть ошибка, связанная с кодом в этом классе. Я не знаю, достаточно ли это информации, поскольку это проект с несколькими интерфейсами и классами.
Это мой класс VideoHandler (подробности в комментариях):
/**
* (10pts) The VideoHandler is a Capability which provides the user
* interface with a way to display incoming video. We will not be doing
* real video, but instead simulating it with text-based terminal output,
* representing images as text pictures. The handler is capable of
* receiving notifications from a video source indicating that the video
* frame has been updated, and that it needs to retrieve the next frame
* and display it.
* @author jaybu
*
*/
public class VideoHandler extends GeneralCapability implements NotificationListener {
private VideoSource videoSource;
/**
* returns the VideoSource object associated with this capability,
* or null if there isn't an association yet.
* @return
*/
public VideoSource getVideoSource() {
return (VideoSource) super.getSharable();
}
/**
* returns true if the particular Capability understands how to
* process the given Sharable stream, and false otherwise
* @param s
* @return
*/
@Override
public boolean recognizeSharable(Sharable s) {
return s instanceof VideoSource;
}
/**
* in addition to linking the Sharable as in the GeneralCapability
* class, this method should set the VideoHandler as a
* NotificationListener for the VideoSource feed by using the
* appropriate method from the VideoSource class.
*/
@Override
public void linkSharable(Sharable s) throws SharableException {
super.linkSharable(s);
((VideoSource)getSharable()).setListener(this);
}
/**
* in addition to unlinking the Sharable as in the GeneralCapability
* class, this method should deregister the VideoHandler as a
* NotificationListener from the VideoSource feed by using the
* appropriate method from VideoSource.
* @param s
*/
@Override
public void unlinkSharable(Sharable s) throws SharableException {
super.unlinkSharable(s);
if (getSharable() != null) {
((VideoSource)getSharable()).removeListener(this);
}
}
/**
* if a VideoSource has been linked to the object, then this method
* will retrieve the new VideoSource contents, and print them out to
* the terminal (followed by a newline).
*/
@Override
public void sendNotification() {
if (videoSource != null) {
String contents = videoSource.getContents();
System.out.println(contents);
}
}
}
Проблема связана с linkSharable , но я думаю, что это происходит из sendNotification , потому что я объявил объект private VideoSource videoSource;. В аналогичном классе ChatHandler у меня есть метод отправки, который выглядит следующим образом:
public class ChatHandler extends GeneralCapability implements MessageSink {
/**
* (10pts) The ChatHandler class is a user interface Capability which
* specifically handles chat messages from a Chat object. We can use it to
* send out messages to others, or to print out messages which have been
* delivered.
*/
/**
* returns the Chat object associated with this capability, or
* null if there isn't an association yet.
* @return
*/
public Chat getChat() {
return (Chat) super.getSharable();
}
/**
* returns true only if the Sharable is a Chat.
*/
@Override
public boolean recognizeSharable(Sharable s) {
return s instanceof Chat;
// TODO Auto-generated method stub
}
/**
* in addition to linking the Sharable as in the GeneralCapability class,
* this method should register the ChatHandler as a MessageSink for the
* Chat feed by using its addSink method.
* @throws SharableException
*/
@Override public void linkSharable(Sharable s) throws SharableException {
super.linkSharable(s);
((Chat)getSharable()).addSink(this);//registers the ChatHandler
}
/**
* in addition to unlinking the Sharable as in the GeneralCapability class,
* this method should deregister the ChatHandler as a MessageSink from the
* Chat feed by using its removeSink method.
*/
@Override public void unlinkSharable(Sharable s) throws SharableException {
super.unlinkSharable(s);
if (getSharable()!= null){
((Chat)getSharable()).removeSink(this);//deregisters the ChatHandler
}
}
/**
* if the Chat is associated, then this method will send the specified
* message to the Chat feed from the current user.
* @param message
*/
public void send(String message) {
// TODO Auto-generated method stub
if(getSharable() != null)
((Chat)getSharable()).send(getOwner(), message);
}
/**
* will print out the incoming message in the format
* "USER: MESSAGE" (including a newline).
*/
@Override
public void deliver(Named sender, String message) {
// TODO Auto-generated method stub
System.out.println(sender.name() + ": " + message);
}
}
Он очень похож на VideoHandler Я просто не знать, как go изменить VideoHandlers , sendNotification без использования объявленного объекта private VideoSource videoSource;
Это ошибка, которую я получаю для videohandler_link в моем тесте:
org.junit.ComparisonFailure: VideoHandler should print contents of linked VideoSource when notified expected:<[testing123
]> but was:<[]>
at org.junit.Assert.assertEquals(Assert.java:115)
at P4Tester.videohandler_link(P4Tester.java:502)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
at org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at org.junit.vintage.engine.execution.RunnerExecutor.execute(RunnerExecutor.java:40)
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Iterator.forEachRemaining(Iterator.java:116)
at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
at org.junit.vintage.engine.VintageTestEngine.executeAllChildren(VintageTestEngine.java:80)
at org.junit.vintage.engine.VintageTestEngine.execute(VintageTestEngine.java:71)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:137)
at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:542)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)