import com.google.common.base.Verify;
import com.google.common.util.concurrent.FutureCallback;
import io.netty.channel.Channel;
-import java.util.ArrayList;
import java.util.Iterator;
-import java.util.List;
import java.util.concurrent.atomic.AtomicLongFieldUpdater;
import javax.annotation.Nonnull;
import javax.annotation.concurrent.GuardedBy;
-import org.opendaylight.openflowjava.protocol.api.connection.OutboundQueue;
-import org.opendaylight.openflowjava.protocol.api.connection.OutboundQueueException;
import org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.OfHeader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-final class StackedOutboundQueue implements OutboundQueue {
+final class StackedOutboundQueue extends AbstractStackedOutboundQueue {
private static final Logger LOG = LoggerFactory.getLogger(StackedOutboundQueue.class);
private static final AtomicLongFieldUpdater<StackedOutboundQueue> BARRIER_XID_UPDATER = AtomicLongFieldUpdater.newUpdater(StackedOutboundQueue.class, "barrierXid");
- private static final AtomicLongFieldUpdater<StackedOutboundQueue> LAST_XID_UPDATER = AtomicLongFieldUpdater.newUpdater(StackedOutboundQueue.class, "lastXid");
-
- @GuardedBy("unflushedSegments")
- private volatile StackedSegment firstSegment;
- @GuardedBy("unflushedSegments")
- private final List<StackedSegment> unflushedSegments = new ArrayList<>(2);
- @GuardedBy("unflushedSegments")
- private final List<StackedSegment> uncompletedSegments = new ArrayList<>(2);
- private final AbstractOutboundQueueManager<?> manager;
private volatile long allocatedXid = -1;
private volatile long barrierXid = -1;
- private volatile long lastXid = -1;
- @GuardedBy("unflushedSegments")
- private Integer shutdownOffset;
-
- // Accessed from Netty only
- private int flushOffset;
-
- StackedOutboundQueue(final AbstractOutboundQueueManager<?> manager) {
- this.manager = Preconditions.checkNotNull(manager);
- firstSegment = StackedSegment.create(0L);
- uncompletedSegments.add(firstSegment);
- unflushedSegments.add(firstSegment);
+ StackedOutboundQueue(final AbstractOutboundQueueManager<?, ?> manager) {
+ super(manager);
}
@GuardedBy("unflushedSegments")
manager.ensureFlushing();
}
- /**
- * Write some entries from the queue to the channel. Guaranteed to run
- * in the corresponding EventLoop.
- *
- * @param channel Channel onto which we are writing
- * @param now
- * @return Number of entries written out
- */
+ @Override
int writeEntries(@Nonnull final Channel channel, final long now) {
// Local cache
StackedSegment segment = firstSegment;
return reserveEntry();
}
+ @Override
boolean pairRequest(final OfHeader message) {
Iterator<StackedSegment> it = uncompletedSegments.iterator();
while (it.hasNext()) {
LOG.debug("Failed to find completion for message {}", message);
return false;
}
-
- long startShutdown(final Channel channel) {
- /*
- * We are dealing with a multi-threaded shutdown, as the user may still
- * be reserving entries in the queue. We are executing in a netty thread,
- * so neither flush nor barrier can be running, which is good news.
- *
- * We will eat up all the slots in the queue here and mark the offset first
- * reserved offset and free up all the cached queues. We then schedule
- * the flush task, which will deal with the rest of the shutdown process.
- */
- synchronized (unflushedSegments) {
- // Increment the offset by the segment size, preventing fast path allocations,
- // since we are holding the slow path lock, any reservations will see the queue
- // in shutdown and fail accordingly.
- final long xid = LAST_XID_UPDATER.addAndGet(this, StackedSegment.SEGMENT_SIZE);
- shutdownOffset = (int) (xid - firstSegment.getBaseXid() - StackedSegment.SEGMENT_SIZE);
-
- return lockedShutdownFlush();
- }
- }
-
- @GuardedBy("unflushedSegments")
- private long lockedShutdownFlush() {
- long entries = 0;
-
- // Fail all queues
- final Iterator<StackedSegment> it = uncompletedSegments.iterator();
- while (it.hasNext()) {
- final StackedSegment segment = it.next();
-
- entries += segment.failAll(OutboundQueueException.DEVICE_DISCONNECTED);
- if (segment.isComplete()) {
- LOG.trace("Cleared segment {}", segment);
- it.remove();
- }
- }
-
- return entries;
- }
-
- boolean finishShutdown() {
- synchronized (unflushedSegments) {
- lockedShutdownFlush();
- }
-
- return !needsFlush();
- }
-
- boolean needsFlush() {
- // flushOffset always points to the first entry, which can be changed only
- // from Netty, so we are fine here.
- if (firstSegment.getBaseXid() + flushOffset > lastXid) {
- return false;
- }
-
- if (shutdownOffset != null && flushOffset >= shutdownOffset) {
- return false;
- }
-
- return firstSegment.getEntry(flushOffset).isCommitted();
- }
}