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[#2800] Fix NPE in SingleThreadEventExecutor on Android

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Motivation:

The recent changes f8bee2e94c to use a FJP introduced a regression on Android that cause a NPE.

Modifications:

- Use AtomicReferenceFieldUpdater so it works also on Android
- Fix inspection warnings

Result:

Netty works again on Android too.
This commit is contained in:
Norman Maurer 2014-08-21 06:31:56 +02:00
parent 62e26a2818
commit ceaab70153
1 changed files with 12 additions and 11 deletions
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23
common/src/main/java/io/netty/util/concurrent/SingleThreadEventExecutor.java
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@ -37,6 +37,7 @@ import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
/**
* Abstract base class for {@link EventExecutor}'s that execute all its submitted tasks in a single thread.
@ -61,8 +62,7 @@ public abstract class SingleThreadEventExecutor extends AbstractEventExecutor {
};
private static final AtomicIntegerFieldUpdater<SingleThreadEventExecutor> STATE_UPDATER;
private static final long threadOffset;
private static final AtomicReferenceFieldUpdater<SingleThreadEventExecutor, Thread> THREAD_UPDATER;
static {
AtomicIntegerFieldUpdater<SingleThreadEventExecutor> updater =
@ -72,12 +72,13 @@ public abstract class SingleThreadEventExecutor extends AbstractEventExecutor {
}
STATE_UPDATER = updater;
try {
threadOffset =
PlatformDependent.objectFieldOffset(SingleThreadEventExecutor.class.getDeclaredField("thread"));
} catch (NoSuchFieldException e) {
throw new RuntimeException();
AtomicReferenceFieldUpdater<SingleThreadEventExecutor, Thread> refUpdater =
PlatformDependent.newAtomicReferenceFieldUpdater(SingleThreadEventExecutor.class, "thread");
if (refUpdater == null) {
refUpdater = AtomicReferenceFieldUpdater.newUpdater(
SingleThreadEventExecutor.class, Thread.class, "thread");
}
THREAD_UPDATER = refUpdater;
}
private final Queue<Runnable> taskQueue;
@ -103,7 +104,7 @@ public abstract class SingleThreadEventExecutor extends AbstractEventExecutor {
private boolean firstRun = true;
private final Runnable AS_RUNNABLE = new Runnable() {
private final Runnable asRunnable = new Runnable() {
@Override
public void run() {
updateThread(Thread.currentThread());
@ -877,11 +878,11 @@ public abstract class SingleThreadEventExecutor extends AbstractEventExecutor {
protected final void scheduleExecution() {
updateThread(null);
executor.execute(AS_RUNNABLE);
executor.execute(asRunnable);
}
private void updateThread(Thread t) {
PlatformDependent.putOrderedObject(this, threadOffset, t);
THREAD_UPDATER.lazySet(this, t);
}
private final class PurgeTask implements Runnable {
@ -911,7 +912,7 @@ public abstract class SingleThreadEventExecutor extends AbstractEventExecutor {
}
@Override
public Callable unwrap() {
public Callable<Void> unwrap() {
return null;
}