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https://issues.apache.org/jira/browse/FLINK-11122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718739#comment-16718739
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ASF GitHub Bot commented on FLINK-11122:
----------------------------------------
StefanRRichter commented on a change in pull request #7273: [FLINK-11122][core]
Change signature of WrappingProxyUtil#stripProxy(T)
URL: https://github.com/apache/flink/pull/7273#discussion_r240955517
##########
File path:
flink-core/src/test/java/org/apache/flink/core/fs/AbstractCloseableRegistryTest.java
##########
@@ -225,4 +209,55 @@ public synchronized void close() throws IOException {
refCount.decrementAndGet();
}
}
+
+ /**
+ * A noop {@link Closeable} implementation that blocks inside {@link
#close()}.
+ */
+ private static class BlockingTestCloseable implements Closeable {
+
+ private final CountDownLatch closeCalledLatch = new
CountDownLatch(1);
+
+ private final CountDownLatch blockCloseLatch = new
CountDownLatch(1);
+
+ @Override
+ public void close() throws IOException {
+ closeCalledLatch.countDown();
+ try {
+ blockCloseLatch.await();
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ }
+ }
+
+ /**
+ * Unblocks {@link #close()}.
+ */
+ public void unblockClose() {
+ blockCloseLatch.countDown();
+ }
+
+ /**
+ * Causes the current thread to wait until {@link #close()} is
called.
+ */
+ public void awaitClose(final long timeout, final TimeUnit
timeUnit) throws InterruptedException {
+ closeCalledLatch.await(timeout, timeUnit);
+ }
+ }
+
+ /**
+ * A noop {@link Closeable} implementation that tracks whether it was
closed.
+ */
+ private static class TestCloseable implements Closeable {
+
+ private final AtomicBoolean closed = new AtomicBoolean();
+
+ @Override
+ public void close() throws IOException {
+ closed.set(true);
Review comment:
We could make the test a bit stricter by ensuring `compareAndSet(false,
true)` to check that close should also be called only once. A small improvent
that would be cheap to do.
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> SafetyNetCloseableRegistryTest fails with ClassCastException
> ------------------------------------------------------------
>
> Key: FLINK-11122
> URL: https://issues.apache.org/jira/browse/FLINK-11122
> Project: Flink
> Issue Type: Sub-task
> Components: Tests
> Reporter: Gary Yao
> Assignee: Gary Yao
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.8.0
>
>
> When compiling and running {{SafetyNetCloseableRegistryTest}} with Java 9,
> some tests fail with a {{ClassCastException}}
> {noformat}
> java.lang.AssertionError: java.lang.ClassCastException:
> org.apache.flink.core.fs.local.LocalDataOutputStream cannot be cast to
> org.apache.flink.core.fs.WrappingProxyCloseable
> at
> org.apache.flink.core.fs.SafetyNetCloseableRegistry$PhantomDelegatingCloseableRef.<init>(SafetyNetCloseableRegistry.java:156)
> at
> org.apache.flink.core.fs.SafetyNetCloseableRegistry.doRegister(SafetyNetCloseableRegistry.java:99)
> at
> org.apache.flink.core.fs.SafetyNetCloseableRegistry.doRegister(SafetyNetCloseableRegistry.java:50)
> at
> org.apache.flink.util.AbstractCloseableRegistry.registerCloseable(AbstractCloseableRegistry.java:79)
> at
> org.apache.flink.core.fs.ClosingFSDataOutputStream.wrapSafe(ClosingFSDataOutputStream.java:101)
> at
> org.apache.flink.core.fs.SafetyNetWrapperFileSystem.create(SafetyNetWrapperFileSystem.java:127)
> at
> org.apache.flink.core.fs.SafetyNetCloseableRegistryTest$3.go(SafetyNetCloseableRegistryTest.java:120)
> at
> org.apache.flink.core.testutils.CheckedThread.run(CheckedThread.java:74)
> {noformat}
> This is due to the problematic signature in
> {{WrappingProxyUtil#stripProxy(T)}}, which expects a generic type {{T}} and
> also returns {{T}}.
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