/*
* Copyright 2003-2016 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrains.mps.nodeEditor.highlighter;
import jetbrains.mps.nodeEditor.EditorComponent;
import jetbrains.mps.nodeEditor.checking.EditorChecker;
import jetbrains.mps.openapi.editor.message.EditorMessageOwner;
import jetbrains.mps.smodel.event.SModelEvent;
import java.util.List;
import java.util.function.Function;
/**
* Wraps an {@link EditorChecker} to provide for synchronous stopping.
* <p>
* Implementations of {@link EditorChecker} are periodically called asynchronously from a background thread. When a plugin is unloaded, its checkers are removed
* from the highlighter and after removal their classes are unloaded. To do this correctly, it must be possible to stop a checker and make sure it is not
* invoked after a certain point in time.
*/
public class EditorCheckerWrapper {
private final EditorChecker myDelegate;
private boolean myStopped;
public EditorCheckerWrapper(EditorChecker delegate) {
myDelegate = delegate;
}
/**
* Marks this instance as stopped. After this method returns, other instance methods will not call the delegate but will either do nothing or return a
* default value. The only exception is {@link #getEditorMessageOwner()} which will continue to work.
* <p>
* Note that some checkers may have their own {@code dispose()} method. The responsibility of that method is different. {@code stop()} marks the checker as no
* longer being used by the highlighter, while the checker's {@code dispose()} method would detach listeners or close other resources used by the checker.
*/
public synchronized void stop() {
myStopped = true;
}
public synchronized boolean isEssential() {
return !myStopped && myDelegate.isEssential();
}
public synchronized boolean needsUpdate(EditorComponent component) {
return !myStopped && myDelegate.needsUpdate(component);
}
public synchronized boolean isLaterThan(EditorCheckerWrapper o2) {
return o2.withChecker(myDelegate::isLaterThan, false);
}
synchronized <T> T withChecker(Function<EditorChecker, T> action, T valueIfDisposed) {
if (myStopped) {
return valueIfDisposed;
}
return action.apply(myDelegate);
}
// Not synchronized, assuming it's a simple getter
public EditorMessageOwner getEditorMessageOwner() {
return myDelegate.getEditorMessageOwner();
}
public synchronized void doneUpdating() {
if (myStopped) {
return;
}
myDelegate.doneUpdating();
}
public synchronized void forceAutofix(EditorComponent editorComponent) {
if (myStopped) {
return;
}
myDelegate.forceAutofix(editorComponent);
}
public synchronized void processEvents(List<SModelEvent> events) {
if (myStopped) {
return;
}
myDelegate.processEvents(events);
}
public boolean isWrapping(EditorChecker checker) {
return myDelegate == checker;
}
}