fix: statement.cancel() waits for statement to finish #531
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crystall-bitquill
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sergiyvamz
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Jan 18, 2024
| Object result = | ||
| ConnectionProxy.this.pluginManager.execute( | ||
| this.invokeOnClass, | ||
| methodName, | ||
| method.getName(), |
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Why methodName isn't good in this case?
sergiyvamz
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Jan 18, 2024
| () -> method.invoke(this.invokeOn, args), | ||
| args); | ||
| return proxyIfReturnTypeIsJdbcInterface(method.getReturnType(), result); | ||
| } finally { | ||
| try { | ||
| this.LOCK.unlock(); |
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Do we need to check is lock has been acquired above?
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karenc-bq
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Jan 19, 2024
| @@ -313,6 +315,14 @@ private boolean isDirectExecute(String methodName) { | |||
| class JdbcInterfaceProxy implements InvocationHandler { | |||
| private final Object invokeOn; | |||
| private final Class<?> invokeOnClass; | |||
| private final ReentrantLock LOCK = new ReentrantLock(); | |||
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Variable name shouldn't be all uppercase here.
karenc-bq
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Jan 19, 2024
| @@ -313,6 +315,14 @@ private boolean isDirectExecute(String methodName) { | |||
| class JdbcInterfaceProxy implements InvocationHandler { | |||
| private final Object invokeOn; | |||
| private final Class<?> invokeOnClass; | |||
| private final ReentrantLock LOCK = new ReentrantLock(); | |||
|
|
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| private final Set<String> NON_SYNCHRONIZED_METHODS = | |||
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karenc-bq
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| boolean locked = false; | ||
| if (nonSynchronizedMethods.contains(methodName)) { | ||
| this.lock.lock(); | ||
| locked = true; |
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What is the purpose of this flag
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You can use the built in checks, either isHeldByCurrentThread or isLocked
karenc-bq
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Jan 25, 2024
| @@ -313,6 +315,14 @@ private boolean isDirectExecute(String methodName) { | |||
| class JdbcInterfaceProxy implements InvocationHandler { | |||
| private final Object invokeOn; | |||
| private final Class<?> invokeOnClass; | |||
| private final ReentrantLock lock = new ReentrantLock(); | |||
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You are using a lock to replace the synchronized keyword, which is a mutex. I think you need to make this static so the lock becomes a mutex
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The lock can't be static!
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Summary
Fix statement.cancel() waiting for statement to finish
Description
When a long running query is executed and
statement.cancel()is used to stop it, the driver will not immediately cancel the statement and will wait for it to finish instead. This PR replaces the synchronized block with a ReentrantLock.Addresses #527
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