Examples with GridCacheQueueHeader org.apache.ignite.internal.processors.datastructures.GridCacheQueueHeader used on opensource projects

Example 1 with GridCacheQueueHeader

use of org.apache.ignite.internal.processors.datastructures.GridCacheQueueHeader in project ignite by apache.

the class CacheDataStructuresManager method queue0.

/**
 * @param name Queue name.
 * @param cap Capacity.
 * @param colloc Collocated flag.
 * @param create Create flag.
 * @return Queue header.
 * @throws IgniteCheckedException If failed.
 */
@SuppressWarnings("unchecked")
@Nullable
public <T> GridCacheQueueProxy<T> queue0(final String name, final int cap, boolean colloc, final boolean create) throws IgniteCheckedException {
    cctx.gate().enter();
    try {
        GridCacheQueueHeaderKey key = new GridCacheQueueHeaderKey(name);
        GridCacheQueueHeader hdr;
        if (create) {
            hdr = new GridCacheQueueHeader(IgniteUuid.randomUuid(), cap, colloc, 0, 0, null);
            GridCacheQueueHeader old = queueHdrView.withNoRetries().getAndPutIfAbsent(key, hdr);
            if (old != null) {
                if (old.capacity() != cap || old.collocated() != colloc)
                    throw new IgniteCheckedException("Failed to create queue, queue with the same name but " + "different configuration already exists [name=" + name + ']');
                hdr = old;
            }
        } else
            hdr = queueHdrView.get(key);
        if (hdr == null)
            return null;
        if (queueQryGuard.compareAndSet(false, true)) {
            queueQryId = cctx.continuousQueries().executeInternalQuery(new CacheEntryUpdatedListener<Object, Object>() {

                @Override
                public void onUpdated(Iterable<CacheEntryEvent<?, ?>> evts) {
                    if (!busyLock.enterBusy())
                        return;
                    try {
                        for (CacheEntryEvent<?, ?> e : evts) {
                            GridCacheQueueHeaderKey key = (GridCacheQueueHeaderKey) e.getKey();
                            GridCacheQueueHeader hdr = (GridCacheQueueHeader) e.getValue();
                            for (final GridCacheQueueProxy queue : queuesMap.values()) {
                                if (queue.name().equals(key.queueName())) {
                                    if (e.getEventType() == REMOVED) {
                                        GridCacheQueueHeader oldHdr = (GridCacheQueueHeader) e.getOldValue();
                                        assert oldHdr != null;
                                        if (oldHdr.id().equals(queue.delegate().id())) {
                                            queue.delegate().onRemoved(false);
                                            queuesMap.remove(queue.delegate().id());
                                        }
                                    } else
                                        queue.delegate().onHeaderChanged(hdr);
                                }
                            }
                        }
                    } finally {
                        busyLock.leaveBusy();
                    }
                }
            }, new QueueHeaderPredicate(), cctx.isLocal() || (cctx.isReplicated() && cctx.affinityNode()), true, false, false);
        }
        GridCacheQueueProxy queue = queuesMap.get(hdr.id());
        if (queue == null) {
            queue = new GridCacheQueueProxy(cctx, cctx.atomic() ? new GridAtomicCacheQueueImpl<>(name, hdr, cctx) : new GridTransactionalCacheQueueImpl<>(name, hdr, cctx));
            GridCacheQueueProxy old = queuesMap.putIfAbsent(hdr.id(), queue);
            if (old != null)
                queue = old;
        }
        return queue;
    } finally {
        cctx.gate().leave();
    }
}