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[CHA-M5] Improved message subscription history implementation #78
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WalkthroughThe changes primarily focus on enhancing the message handling and subscription logic within the Changes
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Actionable comments posted: 1
🧹 Outside diff range and nitpick comments (1)
chat-android/src/test/java/com/ably/chat/MessagesTest.kt (1)
269-269
: Avoid using reflection to access private fields in testsAccessing
eventListeners
via reflection may lead to maintenance issues. Consider exposing necessary internal states through public or internal APIs designed for testing.Apply this diff to replace reflection with a testing accessor:
- val eventListeners = getPrivateField<HashMap<*, *>>("eventListeners") + val eventListeners = channel.getEventListenersForTesting()And in the
Channel
class, add:// In the Channel class internal fun getEventListenersForTesting(): HashMap<*, *> { return eventListeners }
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (6)
chat-android/src/main/java/com/ably/chat/Messages.kt
(6 hunks)chat-android/src/main/java/com/ably/chat/Utils.kt
(1 hunks)chat-android/src/test/java/com/ably/chat/MessagesTest.kt
(4 hunks)chat-android/src/test/java/com/ably/chat/PresenceTest.kt
(4 hunks)chat-android/src/test/java/com/ably/chat/RoomReactionsTest.kt
(2 hunks)chat-android/src/test/java/com/ably/chat/TestUtils.kt
(0 hunks)
💤 Files with no reviewable changes (1)
- chat-android/src/test/java/com/ably/chat/TestUtils.kt
🧰 Additional context used
📓 Learnings (1)
chat-android/src/test/java/com/ably/chat/RoomReactionsTest.kt (1)
Learnt from: sacOO7
PR: ably/ably-chat-kotlin#66
File: chat-android/src/test/java/com/ably/chat/RoomReactionsTest.kt:44-50
Timestamp: 2024-11-28T11:08:42.524Z
Learning: The test cases for verifying behavior when the room is not in the ATTACHED state are covered in `chat-android/src/test/java/com/ably/chat/room/RoomEnsureAttachedTest.kt`.
🔇 Additional comments (16)
chat-android/src/test/java/com/ably/chat/RoomReactionsTest.kt (2)
13-13
: LGTM! Import aligns with the concurrency improvements.
The addition of CompletableDeferred
import supports the transition from custom DeferredValue
to Kotlin's built-in concurrent primitives.
63-66
: LGTM! Proper implementation of CompletableDeferred.
The changes correctly implement the transition from DeferredValue
to CompletableDeferred
:
- Using
CompletableDeferred<Reaction>()
for type-safe deferred value - Using
complete(it)
method which is the standard way to complete aCompletableDeferred
This change aligns with the PR's objective of improving concurrency handling by using native thread-safe primitives.
chat-android/src/test/java/com/ably/chat/PresenceTest.kt (4)
14-14
: LGTM: Appropriate import for CompletableDeferred
The addition of CompletableDeferred
import aligns with the PR's objective to improve concurrency handling.
46-49
: LGTM: Clean transition to CompletableDeferred
The change from DeferredValue
to CompletableDeferred
maintains the same test behavior while providing better thread-safety. The use of complete(it)
is the correct method for CompletableDeferred
.
82-85
: LGTM: Consistent implementation pattern
The changes maintain consistency with the previous test method, following the same CompletableDeferred pattern.
119-122
: LGTM: Complete transition to CompletableDeferred
The consistent application of CompletableDeferred across all test methods completes the transition from DeferredValue. The test coverage and behavior remain intact while gaining improved thread-safety.
Let's verify that all DeferredValue usage has been replaced:
✅ Verification successful
Transition to CompletableDeferred is complete and consistent
All instances of deferred values in the test files are using CompletableDeferred
. The search results show that the pattern is consistently applied across all test files (PresenceTest.kt
, MessagesTest.kt
, RoomReactionsTest.kt
, SandboxTest.kt
), and there are no remaining instances of the old DeferredValue
pattern. The transition has been successfully completed while maintaining the same testing behavior.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Verify no remaining DeferredValue usage
# Search for any remaining references to DeferredValue
rg "DeferredValue"
Length of output: 18
Script:
#!/bin/bash
# Let's search for any deferred value usage patterns more broadly
rg -i "deferred.*value"
# Also check for any remaining test files that might use similar patterns
fd "Test.kt" --exec rg -l "Deferred"
Length of output: 3004
chat-android/src/main/java/com/ably/chat/Messages.kt (6)
11-12
: Imports are appropriate for concurrency improvements
The addition of ConcurrentHashMap
and CompletableDeferred
imports is necessary to support the enhanced concurrency mechanisms implemented in the code.
241-248
: Use of ConcurrentHashMap
and CompletableDeferred
enhances thread safety
Declaring channelSerialMap
as a ConcurrentHashMap
and deferredChannelSerial
as a CompletableDeferred
ensures thread-safe operations when managing channel serials across multiple subscribers.
291-297
: Initialize channel serial for new subscribers when channel is attached
The code correctly assigns the current channelSerial
to new subscribers if the channel state is attached
, ensuring they have the appropriate starting point for message history.
307-308
: Appropriate error handling when subscription is already unsubscribed
Throwing a clientError
if the messageListener
is not found in channelSerialMap
provides clear feedback that the subscription has been unsubscribed.
319-319
: Verify that channelSerial
is available when channel is attached
Ensure that channel.properties.channelSerial
is not null when the channel is in the attached
state to avoid unexpected errors.
Run the following script to check if channelSerial
is always set upon attachment:
✅ Verification successful
Based on the code analysis, I can now generate the final response:
The channelSerial validation is correctly implemented
The code shows that:
- The channelSerial is properly checked during channel attachment, as evidenced by the test cases that verify the serial's availability.
- The implementation updates channelSerial appropriately during channel state changes, particularly after reattachment.
- The test cases demonstrate that channelSerial is consistently available in the attached state and is properly propagated to subscriptions.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Ensure that channelSerial is non-null when channel state is 'attached'
# Search for places where the channel becomes attached without a channelSerial
rg 'channel\.state\s*=\s*ChannelState\.attached' -A 5 | rg -C 5 'channelSerial\s*=\s*null'
Length of output: 92
Script:
#!/bin/bash
# Let's analyze the channel attachment and channelSerial handling more thoroughly
# First, let's find where channelSerial is set during attachment
rg -A 5 "channelSerial\s*=.*"
# Also check for attachment state handling
rg -A 10 "ChannelState\.attached"
# Look for any error handling related to channelSerial
rg -A 5 "channelSerial.*null|channelSerial.*undefined"
Length of output: 22613
Script:
#!/bin/bash
# Let's look at the implementation of requireChannelSerial and where channelSerial is set during attachment
# Find the implementation of requireChannelSerial
ast-grep --pattern 'fun requireChannelSerial() {
$$$
}'
# Look for where channelSerial is set during attachment process
rg -B 5 'properties\.channelSerial'
# Check for attachment protocol implementation
ast-grep --pattern 'onChannelStateChanged($$$) {
$$$
}'
Length of output: 3775
324-324
: Confirm attachSerial
is set when channel is attached
Similarly, verify that channel.properties.attachSerial
is not null in the attached
state to prevent errors when calling requireAttachSerial()
.
Run the following script to ensure attachSerial
is always set upon attachment:
chat-android/src/main/java/com/ably/chat/Utils.kt (1)
200-202
: Addition of helper functions for error handling enhances code clarity
The clientError
and serverError
functions provide convenient wrappers for creating exceptions with appropriate error codes and statuses, improving code readability and maintainability.
chat-android/src/test/java/com/ably/chat/MessagesTest.kt (3)
20-20
: Updated import aligns with concurrency changes
Importing CompletableDeferred
reflects the shift from DeferredValue
to CompletableDeferred
in the main codebase.
97-100
: Refactor tests to use CompletableDeferred
Replacing DeferredValue
with CompletableDeferred
in tests ensures consistency with the updated implementation and improves test reliability.
202-208
: Additional assertions strengthen test coverage
Verifying that channelSerial
is correctly used at the point of subscription when the channel state is attached
enhances the robustness of the test by ensuring the subscription logic functions as intended.
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1. Removed use of custom 'DeferredValue', which can become bottleneck in heavy concurrency scenarios. 2. Replaced with thread safe native 'CompletableDeferred', supports thread safe concurrent operations. 3. Removed unnecessary 'lock' and 'listeners' properties from Messages, since concurrency and channel serial access already taken care by CompletableDeferred 4. Updated tests using `DeferredValue` with `CompletableDeferred`
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Actionable comments posted: 0
🧹 Outside diff range and nitpick comments (1)
chat-android/src/main/java/com/ably/chat/Messages.kt (1)
241-248
: LGTM: Thread-safe channel serial managementGood implementation of concurrent data structures. Consider adding a brief comment explaining the purpose of
channelSerialMap
for better code documentation.Add documentation for channelSerialMap:
+ /** + * Thread-safe mapping of message listeners to their corresponding channel serials. + * Used to track subscription points for each listener independently. + */ private val channelSerialMap = ConcurrentHashMap<PubSubMessageListener, CompletableDeferred<String>>()
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (6)
chat-android/src/main/java/com/ably/chat/Messages.kt
(6 hunks)chat-android/src/main/java/com/ably/chat/Utils.kt
(1 hunks)chat-android/src/test/java/com/ably/chat/MessagesTest.kt
(4 hunks)chat-android/src/test/java/com/ably/chat/PresenceTest.kt
(4 hunks)chat-android/src/test/java/com/ably/chat/RoomReactionsTest.kt
(2 hunks)chat-android/src/test/java/com/ably/chat/TestUtils.kt
(0 hunks)
💤 Files with no reviewable changes (1)
- chat-android/src/test/java/com/ably/chat/TestUtils.kt
🚧 Files skipped from review as they are similar to previous changes (4)
- chat-android/src/test/java/com/ably/chat/PresenceTest.kt
- chat-android/src/test/java/com/ably/chat/RoomReactionsTest.kt
- chat-android/src/main/java/com/ably/chat/Utils.kt
- chat-android/src/test/java/com/ably/chat/MessagesTest.kt
🔇 Additional comments (5)
chat-android/src/main/java/com/ably/chat/Messages.kt (5)
11-12
: LGTM: Appropriate imports for concurrent operations
The addition of ConcurrentHashMap
and CompletableDeferred
imports aligns with the goal of improving thread-safety in message subscription handling.
258-267
: Implementation looks good
The atomic update of channel serials has been implemented as previously suggested.
317-317
: LGTM: Improved error handling consistency
Good transition to using specific error types with clear error messages.
Also applies to: 322-322, 339-339
✅ Verification successful
Let me analyze the error handling patterns from the results. I can see that:
clientError
is used consistently inMessages.kt
for client-side validation errorsserverError
is used for server-related issuesAblyException.fromErrorInfo
is used primarily in utility functions and API-related code
Let me verify if these patterns align with any established conventions in the codebase.
Error handling follows established patterns correctly
The changes align with the codebase's error handling conventions where:
clientError()
is used for client-side validation failures (HTTP 400)serverError()
is used for server-related issues (HTTP 500)- Both are utility functions that create properly formatted
AblyException
instances
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Verify consistent error handling across the codebase
rg "throw (AblyException|clientError|serverError)" --type kotlin
Length of output: 2824
Script:
#!/bin/bash
# Check if there are any error handling utility functions or documentation
rg -A 5 "fun (client|server)Error" --type kotlin
Length of output: 447
196-196
: LGTM: Improved thread-safety with CompletableDeferred
The change from DeferredValue
to CompletableDeferred
enhances thread-safety for serial handling.
✅ Verification successful
LGTM: CompletableDeferred change is properly implemented
The verification confirms that the change from DeferredValue
to CompletableDeferred
is correctly implemented. All usages of fromSerialProvider
are compatible with the new type:
- Used correctly in test assertions with
.await()
- Properly initialized in the implementation
- No remnants of the old
DeferredValue
type found in the codebase
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Verify that all usages of fromSerialProvider are compatible with CompletableDeferred
rg "fromSerialProvider.*DeferredValue" --type kotlin
Length of output: 54
Script:
#!/bin/bash
# Let's first find all usages of fromSerialProvider to understand its implementation and usage
rg "fromSerialProvider" -A 3 --type kotlin
# Also search for DeferredValue to understand the previous type usage
rg "DeferredValue" -A 3 --type kotlin
# Let's also check the class/interface definition where fromSerialProvider is declared
ast-grep --pattern 'interface $_ {
$$$
val fromSerialProvider
$$$
}'
Length of output: 3606
289-306
: Consider potential race condition in channel state checking
While the implementation is generally good, there's a potential race condition between checking the channel state and retrieving the channel serial. Consider using a synchronized block or atomic operation to ensure consistency.
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LGTM
DeferredValue
, which can become bottleneck in heavy concurrency scenarios.CompletableDeferred
.lock
andlisteners
properties from Messages, since desired behaviour is already taken care by the thread-safe CompletableDeferredDeferredValue
withCompletableDeferred
Summary by CodeRabbit
Release Notes
New Features
Bug Fixes
Refactor
DeferredValue
toCompletableDeferred
for better concurrency handling.Tests