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Clenaup: simplify EpollEventLoop.closeAll() (#8719)

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Motivation:

Avoid unnecessary iteration and `ArrayList` allocation.

Modification:

```
for (AbstractEpollChannel channel: channels.values()) {
     array.add(channel);
}
```
replaced with 

`array.addAll(channels.values())`

and

```
Collection<AbstractEpollChannel> array = new ArrayList<AbstractEpollChannel>(channels.size());
array.addAll(channels.values())
```

replaced with:

`AbstractEpollChannel[] localChannels = channels.values().toArray(new AbstractEpollChannel[0]);`

Result:

Simpler code in `EpollEventLoop.closeAll();`
This commit is contained in:
Dmitriy Dumanskiy 2019-01-16 12:00:25 +02:00 committed by Norman Maurer
parent 53d711bdc7
commit 165912365a
1 changed files with 2 additions and 8 deletions
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10
transport-native-epoll/src/main/java/io/netty/channel/epoll/EpollEventLoop.java
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@ -32,8 +32,6 @@ import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Queue;
import java.util.concurrent.Executor;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
@ -379,13 +377,9 @@ class EpollEventLoop extends SingleThreadEventLoop {
}
// Using the intermediate collection to prevent ConcurrentModificationException.
// In the `close()` method, the channel is deleted from `channels` map.
Collection<AbstractEpollChannel> array = new ArrayList<AbstractEpollChannel>(channels.size());
AbstractEpollChannel[] localChannels = channels.values().toArray(new AbstractEpollChannel[0]);
for (AbstractEpollChannel channel: channels.values()) {
array.add(channel);
}
for (AbstractEpollChannel ch: array) {
for (AbstractEpollChannel ch : localChannels) {
ch.unsafe().close(ch.unsafe().voidPromise());
}
}