ADFA-5259 | Add file-targeted IdeEditorService.saveFile(File) API - #1750
ADFA-5259 | Add file-targeted IdeEditorService.saveFile(File) API#1750jatezzz wants to merge 3 commits into
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saveCurrentFile() saves whichever tab has focus and returns true as soon as the save is dispatched. A plugin editing an unfocused file therefore had to steal focus first, and openFile() only posts the tab switch - so the save read a stale tab index, persisted the user's other tab, and reported success. saveFile(file) removes focus from the causal chain: it resolves the editor by File, blocks until the write completes, and returns whether the bytes are on disk. A clean buffer counts as saved - CodeEditorView.save() reports "nothing to do" and "write failed" with the same false - and a completed write is verified by byte length to catch truncation. The permission check follows the file-targeted surface (requireWrite + ensureFileAccessible) rather than writableCurrentFile, which inspects the focused file. saveCurrentFile() stays as the "save what the user is looking at" primitive. Guards: the call rejects the main thread up front, since the save itself runs there and blocking from it would deadlock until the timeout. setFilesSaving now resets under NonCancellable so a timed-out save cannot leave the Save action disabled for the session.
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📝 Walkthrough
WalkthroughThe plugin editor service now provides a suspendable ChangesFile Save Flow
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The file-targeted save behavior is mergeable, with explicit follow-up recommended for a test failure path that could leave the test process running after an assertion failure; no production merge-blocking risk is identified. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant Plugin
participant IdeEditorServiceImpl
participant EditorProviderImpl
participant EditorHandlerActivity
participant Disk
Plugin->>IdeEditorServiceImpl: saveFile(file)
IdeEditorServiceImpl->>EditorProviderImpl: check access and saveFile(file)
EditorProviderImpl->>EditorHandlerActivity: saveFileResult(file)
EditorHandlerActivity->>Disk: write buffer
Disk-->>EditorHandlerActivity: save result
EditorHandlerActivity-->>Plugin: Boolean result
Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In
`@app/src/main/java/com/itsaky/androidide/activities/editor/EditorHandlerActivity.kt`:
- Around line 1053-1063: Update performFileSave so each activeSaveCount
transition and its corresponding setFilesSaving update execute together in one
serialized Main-thread operation, preventing a queued false update from
overtaking a subsequent true update during overlapping saves. Preserve the
existing first-save/last-save semantics, and add a regression test covering
overlapping saves initiated off the Main thread.
- Around line 958-963: Update saveFile handling in EditorHandlerActivity around
getEditorForFile and saveResultInternal to catch expected SecurityException
authorization failures and return false, preserving successful saves and
existing early-return behavior. In
plugin-api/src/main/kotlin/com/itsaky/androidide/plugins/services/IdeServices.kt
lines 185-187, make no direct change; it documents the expected false result.
Apply the same fix in
`@plugin-api/src/main/kotlin/com/itsaky/androidide/plugins/services/IdeServices.kt`
around lines 189 - 195: Defines the Boolean failure contract that must match the
implementation.
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app/src/main/java/com/itsaky/androidide/activities/editor/EditorHandlerActivity.ktapp/src/main/java/com/itsaky/androidide/app/EditorProviderImpl.ktplugin-api/api/plugin-api.apiplugin-api/src/main/kotlin/com/itsaky/androidide/plugins/services/IdeServices.ktplugin-manager/src/main/kotlin/com/itsaky/androidide/plugins/manager/core/PluginManager.ktplugin-manager/src/main/kotlin/com/itsaky/androidide/plugins/manager/services/IdeEditorServiceImpl.kt
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jatezzz
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Move the count into the flag's main-thread section: off-main it decremented to zero and queued false, which landed after a main-thread save had set true inline.
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Actionable comments posted: 1
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Inline comments:
In
`@app/src/test/java/com/itsaky/androidide/activities/editor/OverlappingSaveFlagTest.kt`:
- Around line 69-82: Update the worker setup and cleanup in the overlapping save
test around endFileSave and awaitPostToMain: make the worker thread daemon, wrap
the test actions in try/finally, and in finally drain mainLooper and perform a
bounded worker.join so cleanup runs even when an assertion fails.
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app/src/main/java/com/itsaky/androidide/activities/editor/EditorHandlerActivity.ktapp/src/test/java/com/itsaky/androidide/activities/editor/OverlappingSaveFlagTest.ktplugin-api/src/main/kotlin/com/itsaky/androidide/plugins/services/IdeServices.kt
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A failed assertion skipped the looper drain, parking the non-daemon worker on a main-thread hop that never ran. Wrap the body in try/finally, drain and bound the join there, and mark the worker daemon.
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Automated code review (xhigh). 13 findings, F01-F13, posted inline.
Likely real bugs: F01 (the fix is defeated by activity recreation), F02 (plugin saves of .gradle.kts/.xml skip sync and generateSources()), F04 (counter can latch the flag on permanently), F05 (double resolution can save the wrong buffer).
Also: F03 main-thread disk IO under StrictMode, F06 unbounded wait / ANR path, F07 stale tab index after the write, F08/F09 doc accuracy and the missing PLUGIN_API_CHANGELOG.md entry, F10-F13 test robustness, coverage gaps, and cleanups.
| private val fileTimestamps = ConcurrentHashMap<String, Long>() | ||
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| /** Number of saves in flight. Main-thread confined; see [beginFileSave]. */ | ||
| private val activeSaveCount = AtomicInteger(0) |
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F01 - activeSaveCount outlives the flag it guards
The counter is per-activity-instance, but the flag it guards (editorViewModel.areFilesSaving) lives in the retained EditorViewModel. EditorActivityKt's manifest configChanges (AndroidManifest.xml:101) covers only orientation|screenSize|screenLayout|smallestScreenSize|fontScale, so a dark-mode / locale / display-size change destroys and recreates the activity.
saveAllAsync runs its save under withContext(NonCancellable), so save A keeps running against the old instance (its counter is 1). The new instance starts save B: its fresh counter goes 0 -> 1 and sets areFilesSaving = true. Save A then finishes on the old instance, its counter goes 1 -> 0, and it writes areFilesSaving = false on the shared retained ViewModel while B is still writing. SaveFileAction re-enables mid-write - exactly the failure this PR was written to fix.
The counter needs to live in EditorViewModel, next to the flag it is paired with.
| private val fileTimestamps = ConcurrentHashMap<String, Long>() | ||
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| /** Number of saves in flight. Main-thread confined; see [beginFileSave]. */ | ||
| private val activeSaveCount = AtomicInteger(0) |
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F13 - AtomicInteger contradicts the KDoc one line above
The doc says "Main-thread confined; see [beginFileSave]", and both mutations now happen inside withContext(NonCancellable + Dispatchers.Main.immediate). Under that invariant the atomics buy nothing and actively obscure it.
A plain private var activeSaveCount = 0 with if (++activeSaveCount == 1) / if (--activeSaveCount == 0) states the confinement honestly and drops the java.util.concurrent.atomic.AtomicInteger import. Leaving AtomicInteger in place invites a future maintainer to conclude the counter is safe to touch off-main - which is precisely the mistake commit a49b6a6 undid.
(If F01 is addressed by moving the counter into the ViewModel, decide the threading story there and document it once.)
| * A clean buffer counts as saved: [CodeEditorView.save] reports "nothing to do" and | ||
| * "write failed" with the same `false`, so the two are separated here. | ||
| * | ||
| * Resolution and the write share one main-thread continuation, so a tab close cannot shift |
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F07 - the atomicity claim does not survive the write
"Resolution and the write share one main-thread continuation, so a tab close cannot shift the index out from under the save" holds only up to the frag capture.
saveResultInternal then calls frag.save(), which suspends into readWriteContext, and afterwards runs withContext(Dispatchers.Main) { val tabPosition = getTabPositionForFileIndex(index); ... if (text.startsWith("*")) tab.text = text.substring(1) } using the index captured before the write.
Close a tab to the left of the saved file during a large write and the asterisk is stripped from the wrong tab, so a genuinely dirty buffer renders as clean. Re-resolve the tab from the file (or from frag) after the write rather than reusing index.
| * Resolution and the write share one main-thread continuation, so a tab close cannot shift | ||
| * the index out from under the save. | ||
| */ | ||
| suspend fun saveFileResult(file: File): Boolean = |
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F11 - the headline feature has no test
OverlappingSaveFlagTest calls beginFileSave/endFileSave directly and never touches saveFileResult, EditorProviderImpl.saveFile, or IdeEditorServiceImpl.saveFile.
Untested and non-obvious behaviors that would silently regress:
- the clean-buffer-counts-as-saved branch returning
true - the no-open-editor branch returning
false - the
catch (Exception)that turns aContentReadWrite.writeTothrow intofalse - the
CancellationExceptionrethrow EditorProviderImpl.saveFile's destroyed-activityfalseIdeEditorServiceImpl.saveFile'srequireWrite()/ensureFileAccessible()SecurityExceptioncontract
That last one is the highest-value gap: the plugin-facing KDoc explicitly advertises it ("Authorization failures throw SecurityException rather than returning false"), and a plugin-visible security guarantee with zero coverage is worth a test on its own. A plain JUnit test over IdeEditorServiceImpl with a stub EditorProvider covers it without Robolectric.
| */ | ||
| suspend fun saveFileResult(file: File): Boolean = | ||
| try { | ||
| performFileSave { |
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F12 - the flag is raised before there is any work to do
performFileSave calls beginFileSave() first; only then does the Main.immediate block discover getEditorForFile(file) == null (file not open) or a clean buffer, and return.
_filesSaving emits true then false with no save in between, so observers of areFilesSaving - and SaveFileAction's enabled state via invalidateOptionsMenu - churn for a no-op. A plugin polling saveFile on a closed file in a loop produces continuous flag flapping.
Resolve the editor first and enter performFileSave only once there is real work.
| @VisibleForTesting | ||
| internal suspend fun endFileSave() { | ||
| withContext(NonCancellable + Dispatchers.Main.immediate) { | ||
| if (activeSaveCount.decrementAndGet() == 0) { |
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F04 - the counter has no floor, so one unbalanced decrement latches the flag on forever
decrementAndGet() == 0 only fires on an exact match. If the count ever reaches -1 the equality never matches again, areFilesSaving stays true for the life of the ViewModel, and SaveFileAction is permanently disabled (enabled = context.areFilesModified() && !context.areFilesSaving()) - precisely the failure beginFileSave's own KDoc warns about.
This is newly reachable: endFileSave was widened from private to internal for the test, so anything in :app can now call it, and the new test already calls it directly.
The removed setFilesSaving(false) in the finally forced the flag down unconditionally and could not get stuck. Clamp it - activeSaveCount.updateAndGet { (it - 1).coerceAtLeast(0) }, or fire on <= 0.
| * Saves [file]'s buffer whatever tab has focus, suspending until the bytes are on disk. | ||
| * | ||
| * Suspending rather than blocking is what makes this safe to call from the main thread: | ||
| * the write itself runs there, so a blocking bridge would deadlock against it. |
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F08 - this KDoc is factually wrong about where the write runs
"the write itself runs there [on the main thread], so a blocking bridge would deadlock against it" - it does not. CodeEditorView.save() (CodeEditorView.kt:386) marshals text.writeTo(file, ...) into withContext(readWriteContext), and readWriteContext is newSingleThreadContext("CodeEditorView") (line 126), a dedicated worker thread.
The deadlock is real, but it comes from the Main.immediate resumption hop, not from the write executing on main. A maintainer who reads this and moves the write off main "to fix the deadlock" will change nothing and still ANR.
Note also that IdeServices.kt:185 makes the opposite claim ("the write is marshalled to the editor thread"). The two should agree; that one is the accurate half.
| * Suspending rather than blocking is what makes this safe to call from the main thread: | ||
| * the write itself runs there, so a blocking bridge would deadlock against it. | ||
| */ | ||
| override suspend fun saveFile(file: File): Boolean { |
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F06 - the only EditorProvider method with no bound on how long it waits
Every other method in this class goes through onMain { }, whose 5s CountDownLatch timeout is documented as "a deadlocked UI should not be able to take the IDE down with it". saveFile has no such bound.
If a plugin calls runBlocking { editorService.saveFile(f) } from the main thread, runBlocking installs a BlockingEventLoop that does not drain the Android Handler queue. CodeEditorView.save() hops to readWriteContext and resumes via Dispatchers.Main.immediate, whose isDispatchNeeded is true from that worker thread, so the resumption is Handler.post-ed and never runs. Hard ANR.
The KDoc's suggested withTimeout cannot rescue this either - its delay is scheduled on the same blocked event loop.
Either enforce the bound host-side (withTimeoutOrNull around saveFileResult) or state plainly in the plugin-facing KDoc that blocking bridges are unsupported.
| } | ||
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| /** Blocks until the worker's main-thread hop is sitting in the paused looper's queue. */ | ||
| private fun awaitPostToMain(mainLooper: ShadowLooper) { |
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F10 - awaitPostToMain synchronizes on the wrong condition
It only asserts that mainLooper.isIdle is false. Any message left in the paused queue by BaseApplication.onCreate or Robolectric.buildActivity satisfies that immediately - before runBlocking(Dispatchers.IO) { activity.endFileSave() } has reached its Handler.post.
The test then calls mainLooper.idle() (draining the unrelated message, not A's decrement) and blocks in ended.await(10_000). But the main thread is the only thing that can drain the worker's post, and it is sitting inside await() - so the worker never completes: 10s burned, then a failure with a misleading message.
It passes today only because the queue happens to be empty. Synchronize on the queue actually growing - snapshot ShadowLooper's queued-message count before spawning the worker and wait for an increase - rather than on mere non-idleness.
| * | ||
| * Default-implemented (no-op) so adding it is a backward-compatible interface extension. | ||
| */ | ||
| suspend fun saveFile(file: File): Boolean = false |
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F09 - new public plugin API with no PLUGIN_API_CHANGELOG.md entry
plugin-api/api/plugin-api.api is updated, but the changelog is not. docs/plugin-api.md's "Before you change the plugin API" checklist requires "[ ] Recorded here or in a changelog so plugin authors can find it", and CLAUDE.md: "When you change code, update the docs that describe it in the same change ... so a doc never outlives the API it documents."
PLUGIN_API_CHANGELOG.md exists specifically so an author can pick a correct plugin.min_ide_version, and it already carries entries of exactly this shape (IdeEditorService.showInlineSuggestion / dismissInlineSuggestion, line 144).
Without a YY.WW row for IdeEditorService.saveFile, an author has no way to know which IDE release first accepts the call - and will ship a plugin whose min_ide_version is too low, hitting the silent = false default here instead of a real save.
2 participants
Description
The existing
saveCurrentFile()API resolves its target based on UI tab focus and launches asynchronously, leading to desynchronization since it returnstruebefore persistence actually occurs. This PR introduces a new file-targetedIdeEditorService.saveFile(File)API that resolves the editor strictly by file, suspends until the write completes, and accurately returns the true on-disk outcome.Details
saveFile(file: File): Booleantoplugin-api/.../services/IdeServices.ktwith a default implementation to maintain compilation compatibility for existing implementers.saveFileinIdeEditorServiceImplusingrequireWrite()andensureFileAccessible(file)without relying onwritableCurrentFile().saveFileinPluginManager.delegatingEditorProvider.EditorHandlerActivityto include aFile-based save that awaits the real disk result and correctly reports an already-clean buffer as saved rather than a failed write.EditorProviderImpl.saveFileto handle main-thread considerations safely without freezing the UI.:plugin-api:assemble,:plugin-manager:assemble, and:app:assembleV8Debugbuild successfully.Before
Screen_Recording_20260824_161034_Code.on.the.Go.mp4
After
Screen_Recording_20260824_161341_Code.on.the.Go.mp4
Ticket
ADFA-5259
Parent ticket: ADFA-5215
Observation