How to use LocalFileSystem.getInstance().refreshAndFindFileByNIO() method in a thread where only read allowed?

Answered

Created June 21, 2022 03:46

I'm trying to find a file in SDK after the SDK is downloaded. However, I cant get file using the LocalFileSystem.getInstance().FindFileByNioFile(path) method cause the LocalFileSystem is not latest. Next ,I try to use refreshAndFindFileByNioFile(path) method in a writeAction,

ApplicationManager.getApplication()
    .runWriteAction((Computable<VirtualFile>) () -> lfs.refreshAndFindFileByNioFile(path));

but end up get error message,

java.lang.Throwable: Write-unsafe context! Model changes are allowed from write-safe contexts only. Please ensure you're using invokeLater/invokeAndWait with a correct modality state (not "any"). See TransactionGuard documentation for details.
  current modality=ModalityState.NON_MODAL
    at com.intellij.openapi.diagnostic.Logger.error(Logger.java:182)
    at com.intellij.openapi.application.TransactionGuardImpl.assertWriteActionAllowed(TransactionGuardImpl.java:140)
    at com.intellij.openapi.vfs.newvfs.RefreshQueueImpl.queueSessionSync(RefreshQueueImpl.java:68)
    at com.intellij.openapi.vfs.newvfs.RefreshQueueImpl.execute(RefreshQueueImpl.java:54)
    at com.intellij.openapi.vfs.newvfs.RefreshSessionImpl.launch(RefreshSessionImpl.java:115)
    at com.intellij.openapi.vfs.newvfs.RefreshQueueImpl.processSingleEvent(RefreshQueueImpl.java:200)
    at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.createAndFindChildWithEventFire(VirtualDirectoryImpl.java:309)
    at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.findChild(VirtualDirectoryImpl.java:82)
    at com.intellij.openapi.vfs.newvfs.impl.VirtualDirectoryImpl.refreshAndFindChild(VirtualDirectoryImpl.java:346)
    at com.intellij.openapi.vfs.newvfs.VfsImplUtil.refreshAndFindFileByPath(VfsImplUtil.java:121)
    at com.intellij.openapi.vfs.impl.local.LocalFileSystemBase.refreshAndFindFileByPath(LocalFileSystemBase.java:69)
    at com.intellij.openapi.vfs.LocalFileSystem.refreshAndFindFileByNioFile(LocalFileSystem.java:51)

So ,how can I refresh LocalFileSystem instance in a thread where only read allowed?

Thank you!

7 comments

Yann Cebron

Created June 21, 2022 13:59

Please show full stacktrace, not arbitrarily cut-off one.

1406633849

Created June 22, 2022 06:17

@Yann Cebron ,Thank you for answering this, the whole error message is that

Write access is allowed from write thread only
com.intellij.openapi.diagnostic.RuntimeExceptionWithAttachments: EventQueue.isDispatchThread()=false Toolkit.getEventQueue()=com.intellij.ide.IdeEventQueue@3f5ddaff
Current thread: Thread[ApplicationImpl pooled thread 1,4,main] 307895593
Write thread: Thread[AWT-EventQueue-0,6,main] 631966621
    at com.intellij.openapi.application.impl.ApplicationImpl.assertIsWriteThread(ApplicationImpl.java:1041)
    at com.intellij.openapi.application.impl.ApplicationImpl.startWrite(ApplicationImpl.java:1123)
    at com.intellij.openapi.application.impl.ApplicationImpl.runWriteActionWithClass(ApplicationImpl.java:922)
    at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:945)
    at com.example.myplugin.MyJsonSchemaFileProvider.getSchemaFile(MyJsonSchemaFileProvider.java:89)
    at com.example.myplugin.MyJsonSchemaProvider.getSchemaFile(MyJsonSchemaProvider.java:33)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl.getSchemaForProvider(JsonSchemaServiceImpl.java:592)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl$MyState.createFileProviderMap(JsonSchemaServiceImpl.java:566)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl$MyState$1.compute(JsonSchemaServiceImpl.java:499)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl$MyState$1.compute(JsonSchemaServiceImpl.java:495)
    at com.intellij.openapi.util.ClearableLazyValue.getValue(ClearableLazyValue.java:39)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl$MyState$1.getValue(JsonSchemaServiceImpl.java:507)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl$MyState$1.getValue(JsonSchemaServiceImpl.java:495)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl$MyState.getFiles(JsonSchemaServiceImpl.java:535)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl.isMappedSchema(JsonSchemaServiceImpl.java:369)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl.isMappedSchema(JsonSchemaServiceImpl.java:365)
    at com.jetbrains.jsonSchema.impl.JsonSchemaServiceImpl.isSchemaFile(JsonSchemaServiceImpl.java:353)
    at com.jetbrains.jsonSchema.JsonSchemaIconProvider.getIcon(JsonSchemaIconProvider.java:25)
    at com.intellij.util.IconUtil.getProvidersIcon(IconUtil.java:222)
    at com.intellij.util.IconUtil.computeFileIcon(IconUtil.java:155)
    at com.intellij.openapi.fileEditor.impl.EditorsSplitters.lambda$updateFileIconAsynchronously$7(EditorsSplitters.java:430)
    at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.insideReadAction(NonBlockingReadActionImpl.java:521)
    at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$attemptComputation$3(NonBlockingReadActionImpl.java:486)
    at com.intellij.openapi.application.impl.ApplicationImpl.tryRunReadAction(ApplicationImpl.java:1078)
    at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runInReadActionWithWriteActionPriority$0(ProgressIndicatorUtils.java:78)
    at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runActionAndCancelBeforeWrite(ProgressIndicatorUtils.java:161)
    at com.intellij.openapi.progress.util.ProgressIndicatorUtils.lambda$runWithWriteActionPriority$1(ProgressIndicatorUtils.java:118)
    at com.intellij.openapi.progress.ProgressManager.lambda$runProcess$0(ProgressManager.java:57)
    at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:183)
    at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:705)
    at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:647)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:63)
    at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:170)
    at com.intellij.openapi.progress.ProgressManager.runProcess(ProgressManager.java:57)
    at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runWithWriteActionPriority(ProgressIndicatorUtils.java:115)
    at com.intellij.openapi.progress.util.ProgressIndicatorUtils.runInReadActionWithWriteActionPriority(ProgressIndicatorUtils.java:78)
    at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.attemptComputation(NonBlockingReadActionImpl.java:486)
    at com.intellij.openapi.application.impl.NonBlockingReadActionImpl$Submission.lambda$transferToBgThread$1(NonBlockingReadActionImpl.java:407)
    at com.intellij.util.concurrency.BoundedTaskExecutor.doRun(BoundedTaskExecutor.java:216)
    at com.intellij.util.concurrency.BoundedTaskExecutor.access$200(BoundedTaskExecutor.java:27)
    at com.intellij.util.concurrency.BoundedTaskExecutor$1.execute(BoundedTaskExecutor.java:195)
    at com.intellij.util.concurrency.BoundedTaskExecutor$1.run(BoundedTaskExecutor.java:187)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668)
    at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665)
    at java.base/java.lang.Thread.run(Thread.java:829)

MyJsonSchemaFileProvider is my custom schemaFileProvider implemention.

Yann Cebron

Created June 22, 2022 07:57

Why do you need to lookup that file in filesystem? Why on every single call?

1406633849

Created June 23, 2022 01:52

@Yann Cebron,In my situation, the schema file of config file changes under certain conditions. So I just look up fileSysytem when searching for schema file in method getSchemaFile(), But when this method is called, the thread state always only allow read , So I cant refresh fileSystem to get the latest schema file.

Yann Cebron

Created June 23, 2022 07:20

Where is the schema file actually located physically?

1406633849

Created June 23, 2022 07:29

@Yann Cebron, the schema file is under my user directory C:\Users\yaphets123\AppData\Local\myshema.json. This file may not esixts, but when I copy one to this directory, LocalFileSystem cant sense the existence of the schema file, So I'm trying to refresh the localFileSystem, but got error msg presented above.

Yann Cebron

Created June 23, 2022 14:26

Please try using com.jetbrains.jsonSchema.extension.JsonSchemaProviderFactory#getResourceFile it should accept absolute URL (see com.intellij.openapi.vfs.VfsUtil#findFileByURL)

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