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Clear listeners when AddressResolverGroups close. (#10011) (#10012)

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Motivation:

When an `AddressResolverGroup` closes, it can leave unwanted listeners attached to its `EventExecutor`'s termination future.

Modifications:

- Keep track of listeners attached to termination futures
- Clear listeners if the `AddressResolverGroup` closes before its associated executor(s)

Result:

Unwanted listeners no longer remain in memory after an `AddressResolverGroup` closes before its associated executor(s).
This commit is contained in:
Jon Chambers 2020-02-10 01:40:06 -05:00 committed by GitHub
parent a3e5e4876c
commit 5114588cba
1 changed files with 23 additions and 6 deletions
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29
resolver/src/main/java/io/netty/resolver/AddressResolverGroup.java
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@ -19,6 +19,7 @@ package io.netty.resolver;
import io.netty.util.concurrent.EventExecutor;
import io.netty.util.concurrent.Future;
import io.netty.util.concurrent.FutureListener;
import io.netty.util.concurrent.GenericFutureListener;
import io.netty.util.internal.ObjectUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
@ -42,13 +43,16 @@ public abstract class AddressResolverGroup<T extends SocketAddress> implements C
private final Map<EventExecutor, AddressResolver<T>> resolvers =
new IdentityHashMap<EventExecutor, AddressResolver<T>>();
private final Map<EventExecutor, GenericFutureListener<Future<Object>>> executorTerminationListeners =
new IdentityHashMap<EventExecutor, GenericFutureListener<Future<Object>>>();
protected AddressResolverGroup() { }
/**
* Returns the {@link AddressResolver} associated with the specified {@link EventExecutor}. If there's no associated
* resolved found, this method creates and returns a new resolver instance created by
* resolver found, this method creates and returns a new resolver instance created by
* {@link #newResolver(EventExecutor)} so that the new resolver is reused on another
* {@link #getResolver(EventExecutor)} call with the same {@link EventExecutor}.
* {@code #getResolver(EventExecutor)} call with the same {@link EventExecutor}.
*/
public AddressResolver<T> getResolver(final EventExecutor executor) {
ObjectUtil.checkNotNull(executor, "executor");
@ -69,15 +73,20 @@ public abstract class AddressResolverGroup<T extends SocketAddress> implements C
}
resolvers.put(executor, newResolver);
executor.terminationFuture().addListener(new FutureListener<Object>() {
final FutureListener<Object> terminationListener = new FutureListener<Object>() {
@Override
public void operationComplete(Future<Object> future) throws Exception {
public void operationComplete(Future<Object> future) {
synchronized (resolvers) {
resolvers.remove(executor);
executorTerminationListeners.remove(executor);
}
newResolver.close();
}
});
};
executorTerminationListeners.put(executor, terminationListener);
executor.terminationFuture().addListener(terminationListener);
r = newResolver;
}
@ -101,9 +110,17 @@ public abstract class AddressResolverGroup<T extends SocketAddress> implements C
synchronized (resolvers) {
rArray = (AddressResolver<T>[]) resolvers.values().toArray(new AddressResolver[0]);
resolvers.clear();
for (final Map.Entry<EventExecutor, GenericFutureListener<Future<Object>>> entry :
executorTerminationListeners.entrySet()) {
entry.getKey().terminationFuture().removeListener(entry.getValue());
}
for (AddressResolver<T> r: rArray) {
executorTerminationListeners.clear();
}
for (final AddressResolver<T> r: rArray) {
try {
r.close();
} catch (Throwable t) {