Examples with GridCacheEntryRemovedException org.apache.ignite.internal.processors.cache.GridCacheEntryRemovedException used on opensource projects

Example 66 with GridCacheEntryRemovedException

use of org.apache.ignite.internal.processors.cache.GridCacheEntryRemovedException in project ignite by apache.

the class GridDhtPartitionDemander method preloadEntry.

/**
 * Adds {@code entry} to partition {@code p}.
 *
 * @param from Node which sent entry.
 * @param p Partition id.
 * @param entry Preloaded entry.
 * @param topVer Topology version.
 * @return {@code False} if partition has become invalid during preloading.
 * @throws IgniteInterruptedCheckedException If interrupted.
 */
private boolean preloadEntry(ClusterNode from, int p, GridCacheEntryInfo entry, AffinityTopologyVersion topVer) throws IgniteCheckedException {
    ctx.database().checkpointReadLock();
    try {
        GridCacheEntryEx cached = null;
        try {
            GridCacheContext cctx = grp.sharedGroup() ? ctx.cacheContext(entry.cacheId()) : grp.singleCacheContext();
            cached = cctx.dhtCache().entryEx(entry.key());
            if (log.isDebugEnabled())
                log.debug("Rebalancing key [key=" + entry.key() + ", part=" + p + ", node=" + from.id() + ']');
            cctx.shared().database().checkpointReadLock();
            try {
                if (preloadPred == null || preloadPred.apply(entry)) {
                    if (cached.initialValue(entry.value(), entry.version(), entry.ttl(), entry.expireTime(), true, topVer, cctx.isDrEnabled() ? DR_PRELOAD : DR_NONE, false)) {
                        // Start tracking.
                        cctx.evicts().touch(cached, topVer);
                        if (cctx.events().isRecordable(EVT_CACHE_REBALANCE_OBJECT_LOADED) && !cached.isInternal())
                            cctx.events().addEvent(cached.partition(), cached.key(), cctx.localNodeId(), (IgniteUuid) null, null, EVT_CACHE_REBALANCE_OBJECT_LOADED, entry.value(), true, null, false, null, null, null, true);
                    } else {
                        // Start tracking.
                        cctx.evicts().touch(cached, topVer);
                        if (log.isDebugEnabled())
                            log.debug("Rebalancing entry is already in cache (will ignore) [key=" + cached.key() + ", part=" + p + ']');
                    }
                } else if (log.isDebugEnabled())
                    log.debug("Rebalance predicate evaluated to false for entry (will ignore): " + entry);
            } finally {
                cctx.shared().database().checkpointReadUnlock();
            }
        } catch (GridCacheEntryRemovedException ignored) {
            if (log.isDebugEnabled())
                log.debug("Entry has been concurrently removed while rebalancing (will ignore) [key=" + cached.key() + ", part=" + p + ']');
        } catch (GridDhtInvalidPartitionException ignored) {
            if (log.isDebugEnabled())
                log.debug("Partition became invalid during rebalancing (will ignore): " + p);
            return false;
        }
    } catch (IgniteInterruptedCheckedException e) {
        throw e;
    } catch (IgniteCheckedException e) {
        throw new IgniteCheckedException("Failed to cache rebalanced entry (will stop rebalancing) [local=" + ctx.localNode() + ", node=" + from.id() + ", key=" + entry.key() + ", part=" + p + ']', e);
    } finally {
        ctx.database().checkpointReadUnlock();
    }
    return true;
}

Example 67 with GridCacheEntryRemovedException

use of org.apache.ignite.internal.processors.cache.GridCacheEntryRemovedException in project ignite by apache.

the class GridNearLockFuture method proceedMapping0.

/**
 * Gets next near lock mapping and either acquires dht locks locally or sends near lock request to
 * remote primary node.
 *
 * @throws IgniteCheckedException If mapping can not be completed.
 */
@SuppressWarnings("unchecked")
private void proceedMapping0() throws IgniteCheckedException {
    GridNearLockMapping map;
    synchronized (this) {
        map = mappings.poll();
    }
    // If there are no more mappings to process, complete the future.
    if (map == null)
        return;
    final GridNearLockRequest req = map.request();
    final Collection<KeyCacheObject> mappedKeys = map.distributedKeys();
    final ClusterNode node = map.node();
    if (filter != null && filter.length != 0)
        req.filter(filter, cctx);
    if (node.isLocal()) {
        req.miniId(-1);
        if (log.isDebugEnabled())
            log.debug("Before locally locking near request: " + req);
        IgniteInternalFuture<GridNearLockResponse> fut = dht().lockAllAsync(cctx, cctx.localNode(), req, filter);
        // Add new future.
        add(new GridEmbeddedFuture<>(new C2<GridNearLockResponse, Exception, Boolean>() {

            @Override
            public Boolean apply(GridNearLockResponse res, Exception e) {
                if (CU.isLockTimeoutOrCancelled(e) || (res != null && CU.isLockTimeoutOrCancelled(res.error())))
                    return false;
                if (e != null) {
                    onError(e);
                    return false;
                }
                if (res == null) {
                    onError(new IgniteCheckedException("Lock response is null for future: " + this));
                    return false;
                }
                if (res.error() != null) {
                    onError(res.error());
                    return false;
                }
                if (log.isDebugEnabled())
                    log.debug("Acquired lock for local DHT mapping [locId=" + cctx.nodeId() + ", mappedKeys=" + mappedKeys + ", fut=" + GridNearLockFuture.this + ']');
                try {
                    int i = 0;
                    for (KeyCacheObject k : mappedKeys) {
                        while (true) {
                            GridNearCacheEntry entry = cctx.near().entryExx(k, req.topologyVersion());
                            try {
                                IgniteBiTuple<GridCacheVersion, CacheObject> oldValTup = valMap.get(entry.key());
                                boolean hasBytes = entry.hasValue();
                                CacheObject oldVal = entry.rawGet();
                                CacheObject newVal = res.value(i);
                                GridCacheVersion dhtVer = res.dhtVersion(i);
                                GridCacheVersion mappedVer = res.mappedVersion(i);
                                // On local node don't record twice if DHT cache already recorded.
                                boolean record = retval && oldValTup != null && oldValTup.get1().equals(dhtVer);
                                if (newVal == null) {
                                    if (oldValTup != null) {
                                        if (oldValTup.get1().equals(dhtVer))
                                            newVal = oldValTup.get2();
                                        oldVal = oldValTup.get2();
                                    }
                                }
                                // Lock is held at this point, so we can set the
                                // returned value if any.
                                entry.resetFromPrimary(newVal, lockVer, dhtVer, node.id(), topVer);
                                entry.readyNearLock(lockVer, mappedVer, res.committedVersions(), res.rolledbackVersions(), res.pending());
                                if (inTx() && implicitTx() && tx.onePhaseCommit()) {
                                    boolean pass = res.filterResult(i);
                                    tx.entry(cctx.txKey(k)).filters(pass ? CU.empty0() : CU.alwaysFalse0Arr());
                                }
                                if (record) {
                                    if (cctx.events().isRecordable(EVT_CACHE_OBJECT_READ))
                                        cctx.events().addEvent(entry.partition(), entry.key(), tx, null, EVT_CACHE_OBJECT_READ, newVal, newVal != null, oldVal, hasBytes, CU.subjectId(tx, cctx.shared()), null, inTx() ? tx.resolveTaskName() : null, keepBinary);
                                    if (cctx.statisticsEnabled())
                                        cctx.cache().metrics0().onRead(oldVal != null);
                                }
                                if (log.isDebugEnabled())
                                    log.debug("Processed response for entry [res=" + res + ", entry=" + entry + ']');
                                // Inner while loop.
                                break;
                            } catch (GridCacheEntryRemovedException ignored) {
                                if (log.isDebugEnabled())
                                    log.debug("Failed to add candidates because entry was " + "removed (will renew).");
                                synchronized (GridNearLockFuture.this) {
                                    // Replace old entry with new one.
                                    entries.set(i, (GridDistributedCacheEntry) cctx.cache().entryEx(entry.key()));
                                }
                            }
                        }
                        // Increment outside of while loop.
                        i++;
                    }
                    // Proceed and add new future (if any) before completing embedded future.
                    proceedMapping();
                } catch (IgniteCheckedException ex) {
                    onError(ex);
                    return false;
                }
                return true;
            }
        }, fut));
    } else {
        final MiniFuture fut = new MiniFuture(node, mappedKeys, ++miniId);
        req.miniId(fut.futureId());
        // Append new future.
        add(fut);
        IgniteInternalFuture<?> txSync = null;
        if (inTx())
            txSync = cctx.tm().awaitFinishAckAsync(node.id(), tx.threadId());
        if (txSync == null || txSync.isDone()) {
            try {
                if (log.isDebugEnabled())
                    log.debug("Sending near lock request [node=" + node.id() + ", req=" + req + ']');
                cctx.io().send(node, req, cctx.ioPolicy());
            } catch (ClusterTopologyCheckedException ex) {
                fut.onResult(ex);
            }
        } else {
            txSync.listen(new CI1<IgniteInternalFuture<?>>() {

                @Override
                public void apply(IgniteInternalFuture<?> t) {
                    try {
                        if (log.isDebugEnabled())
                            log.debug("Sending near lock request [node=" + node.id() + ", req=" + req + ']');
                        cctx.io().send(node, req, cctx.ioPolicy());
                    } catch (ClusterTopologyCheckedException ex) {
                        fut.onResult(ex);
                    } catch (IgniteCheckedException e) {
                        onError(e);
                    }
                }
            });
        }
    }
}

Example 68 with GridCacheEntryRemovedException

use of org.apache.ignite.internal.processors.cache.GridCacheEntryRemovedException in project ignite by apache.

the class GridNearLockFuture method map.

/**
 * Maps keys to nodes. Note that we can not simply group keys by nodes and send lock request as
 * such approach does not preserve order of lock acquisition. Instead, keys are split in continuous
 * groups belonging to one primary node and locks for these groups are acquired sequentially.
 *
 * @param keys Keys.
 * @param remap Remap flag.
 * @param topLocked {@code True} if thread already acquired lock preventing topology change.
 */
private void map(Iterable<KeyCacheObject> keys, boolean remap, boolean topLocked) {
    try {
        AffinityTopologyVersion topVer = this.topVer;
        assert topVer != null;
        assert topVer.topologyVersion() > 0 : topVer;
        if (CU.affinityNodes(cctx, topVer).isEmpty()) {
            onDone(new ClusterTopologyServerNotFoundException("Failed to map keys for near-only cache (all " + "partition nodes left the grid)."));
            return;
        }
        boolean clientNode = cctx.kernalContext().clientNode();
        assert !remap || (clientNode && (tx == null || !tx.hasRemoteLocks()));
        synchronized (this) {
            mappings = new ArrayDeque<>();
            // Assign keys to primary nodes.
            GridNearLockMapping map = null;
            for (KeyCacheObject key : keys) {
                GridNearLockMapping updated = map(key, map, topVer);
                // If new mapping was created, add to collection.
                if (updated != map) {
                    mappings.add(updated);
                    if (tx != null && updated.node().isLocal())
                        tx.nearLocallyMapped(true);
                }
                map = updated;
            }
            if (isDone()) {
                if (log.isDebugEnabled())
                    log.debug("Abandoning (re)map because future is done: " + this);
                return;
            }
            if (log.isDebugEnabled())
                log.debug("Starting (re)map for mappings [mappings=" + mappings + ", fut=" + this + ']');
            boolean first = true;
            // Create mini futures.
            for (Iterator<GridNearLockMapping> iter = mappings.iterator(); iter.hasNext(); ) {
                GridNearLockMapping mapping = iter.next();
                ClusterNode node = mapping.node();
                Collection<KeyCacheObject> mappedKeys = mapping.mappedKeys();
                assert !mappedKeys.isEmpty();
                GridNearLockRequest req = null;
                Collection<KeyCacheObject> distributedKeys = new ArrayList<>(mappedKeys.size());
                boolean explicit = false;
                for (KeyCacheObject key : mappedKeys) {
                    IgniteTxKey txKey = cctx.txKey(key);
                    while (true) {
                        GridNearCacheEntry entry = null;
                        try {
                            entry = cctx.near().entryExx(key, topVer);
                            if (!cctx.isAll(entry, filter)) {
                                if (log.isDebugEnabled())
                                    log.debug("Entry being locked did not pass filter (will not lock): " + entry);
                                onComplete(false, false, true);
                                return;
                            }
                            // Removed exception may be thrown here.
                            GridCacheMvccCandidate cand = addEntry(topVer, entry, node.id());
                            if (isDone()) {
                                if (log.isDebugEnabled())
                                    log.debug("Abandoning (re)map because future is done after addEntry attempt " + "[fut=" + this + ", entry=" + entry + ']');
                                return;
                            }
                            if (cand != null) {
                                if (tx == null && !cand.reentry())
                                    cctx.mvcc().addExplicitLock(threadId, cand, topVer);
                                IgniteBiTuple<GridCacheVersion, CacheObject> val = entry.versionedValue();
                                if (val == null) {
                                    GridDhtCacheEntry dhtEntry = dht().peekExx(key);
                                    try {
                                        if (dhtEntry != null)
                                            val = dhtEntry.versionedValue(topVer);
                                    } catch (GridCacheEntryRemovedException ignored) {
                                        assert dhtEntry.obsolete() : dhtEntry;
                                        if (log.isDebugEnabled())
                                            log.debug("Got removed exception for DHT entry in map (will ignore): " + dhtEntry);
                                    }
                                }
                                GridCacheVersion dhtVer = null;
                                if (val != null) {
                                    dhtVer = val.get1();
                                    valMap.put(key, val);
                                }
                                if (!cand.reentry()) {
                                    if (req == null) {
                                        boolean clientFirst = false;
                                        if (first) {
                                            clientFirst = clientNode && !topLocked && (tx == null || !tx.hasRemoteLocks());
                                            first = false;
                                        }
                                        assert !implicitTx() && !implicitSingleTx() : tx;
                                        req = new GridNearLockRequest(cctx.cacheId(), topVer, cctx.nodeId(), threadId, futId, lockVer, inTx(), read, retval, isolation(), isInvalidate(), timeout, mappedKeys.size(), inTx() ? tx.size() : mappedKeys.size(), inTx() && tx.syncMode() == FULL_SYNC, inTx() ? tx.subjectId() : null, inTx() ? tx.taskNameHash() : 0, read ? createTtl : -1L, read ? accessTtl : -1L, skipStore, keepBinary, clientFirst, true, cctx.deploymentEnabled());
                                        mapping.request(req);
                                    }
                                    distributedKeys.add(key);
                                    if (tx != null)
                                        tx.addKeyMapping(txKey, mapping.node());
                                    req.addKeyBytes(key, retval && dhtVer == null, dhtVer, // Include DHT version to match remote DHT entry.
                                    cctx);
                                }
                                if (cand.reentry())
                                    explicit = tx != null && !entry.hasLockCandidate(tx.xidVersion());
                            } else {
                                if (timedOut)
                                    return;
                                // Ignore reentries within transactions.
                                explicit = tx != null && !entry.hasLockCandidate(tx.xidVersion());
                            }
                            if (explicit)
                                tx.addKeyMapping(txKey, mapping.node());
                            break;
                        } catch (GridCacheEntryRemovedException ignored) {
                            assert entry.obsolete() : "Got removed exception on non-obsolete entry: " + entry;
                            if (log.isDebugEnabled())
                                log.debug("Got removed entry in lockAsync(..) method (will retry): " + entry);
                        }
                    }
                    // Mark mapping explicit lock flag.
                    if (explicit) {
                        boolean marked = tx != null && tx.markExplicit(node.id());
                        assert tx == null || marked;
                    }
                }
                if (!distributedKeys.isEmpty())
                    mapping.distributedKeys(distributedKeys);
                else {
                    assert mapping.request() == null;
                    iter.remove();
                }
            }
        }
        cctx.mvcc().recheckPendingLocks();
        proceedMapping();
    } catch (IgniteCheckedException ex) {
        onError(ex);
    }
}

Example 69 with GridCacheEntryRemovedException

use of org.apache.ignite.internal.processors.cache.GridCacheEntryRemovedException in project ignite by apache.

the class IgniteTxHandler method startRemoteTx.

/**
 * @param nodeId Node ID.
 * @param req Request.
 * @param res Response.
 * @return Remote transaction.
 * @throws IgniteCheckedException If failed.
 */
@Nullable
GridDhtTxRemote startRemoteTx(UUID nodeId, GridDhtTxPrepareRequest req, GridDhtTxPrepareResponse res) throws IgniteCheckedException {
    if (!F.isEmpty(req.writes())) {
        GridDhtTxRemote tx = ctx.tm().tx(req.version());
        if (tx == null) {
            boolean single = req.last() && req.writes().size() == 1;
            tx = new GridDhtTxRemote(ctx, req.nearNodeId(), req.futureId(), nodeId, req.topologyVersion(), req.version(), null, req.system(), req.policy(), req.concurrency(), req.isolation(), req.isInvalidate(), req.timeout(), req.writes() != null ? Math.max(req.writes().size(), req.txSize()) : req.txSize(), req.nearXidVersion(), req.transactionNodes(), req.subjectId(), req.taskNameHash(), single, req.storeWriteThrough());
            tx.writeVersion(req.writeVersion());
            tx = ctx.tm().onCreated(null, tx);
            if (tx == null || !ctx.tm().onStarted(tx)) {
                if (log.isDebugEnabled())
                    log.debug("Attempt to start a completed transaction (will ignore): " + tx);
                return null;
            }
            if (ctx.discovery().node(nodeId) == null) {
                tx.state(ROLLING_BACK);
                tx.state(ROLLED_BACK);
                ctx.tm().uncommitTx(tx);
                return null;
            }
        } else {
            tx.writeVersion(req.writeVersion());
            tx.transactionNodes(req.transactionNodes());
        }
        if (!tx.isSystemInvalidate()) {
            int idx = 0;
            for (IgniteTxEntry entry : req.writes()) {
                GridCacheContext cacheCtx = entry.context();
                int part = cacheCtx.affinity().partition(entry.key());
                GridDhtLocalPartition locPart = cacheCtx.topology().localPartition(part, req.topologyVersion(), false);
                if (locPart != null && locPart.reserve()) {
                    try {
                        tx.addWrite(entry, ctx.deploy().globalLoader());
                        if (isNearEnabled(cacheCtx) && req.invalidateNearEntry(idx))
                            invalidateNearEntry(cacheCtx, entry.key(), req.version());
                        if (req.needPreloadKey(idx)) {
                            GridCacheEntryEx cached = entry.cached();
                            if (cached == null)
                                cached = cacheCtx.cache().entryEx(entry.key(), req.topologyVersion());
                            GridCacheEntryInfo info = cached.info();
                            if (info != null && !info.isNew() && !info.isDeleted())
                                res.addPreloadEntry(info);
                        }
                        if (cacheCtx.readThroughConfigured() && !entry.skipStore() && entry.op() == TRANSFORM && entry.oldValueOnPrimary() && !entry.hasValue()) {
                            while (true) {
                                try {
                                    GridCacheEntryEx cached = entry.cached();
                                    if (cached == null) {
                                        cached = cacheCtx.cache().entryEx(entry.key(), req.topologyVersion());
                                        entry.cached(cached);
                                    }
                                    CacheObject val = cached.innerGet(/*ver*/
                                    null, tx, /*readThrough*/
                                    false, /*updateMetrics*/
                                    false, /*evt*/
                                    false, tx.subjectId(), /*transformClo*/
                                    null, tx.resolveTaskName(), /*expiryPlc*/
                                    null, /*keepBinary*/
                                    true);
                                    if (val == null)
                                        val = cacheCtx.toCacheObject(cacheCtx.store().load(null, entry.key()));
                                    if (val != null)
                                        entry.readValue(val);
                                    break;
                                } catch (GridCacheEntryRemovedException ignored) {
                                    if (log.isDebugEnabled())
                                        log.debug("Got entry removed exception, will retry: " + entry.txKey());
                                    entry.cached(cacheCtx.cache().entryEx(entry.key(), req.topologyVersion()));
                                }
                            }
                        }
                    } catch (GridDhtInvalidPartitionException e) {
                        tx.addInvalidPartition(cacheCtx, e.partition());
                        tx.clearEntry(entry.txKey());
                    } finally {
                        locPart.release();
                    }
                } else
                    tx.addInvalidPartition(cacheCtx, part);
                idx++;
            }
        }
        // Prepare prior to reordering, so the pending locks added
        // in prepare phase will get properly ordered as well.
        tx.prepareRemoteTx();
        if (req.last()) {
            assert !F.isEmpty(req.transactionNodes()) : "Received last prepare request with empty transaction nodes: " + req;
            tx.state(PREPARED);
        }
        res.invalidPartitionsByCacheId(tx.invalidPartitions());
        if (tx.empty() && req.last()) {
            tx.rollbackRemoteTx();
            return null;
        }
        return tx;
    }
    return null;
}

Example 70 with GridCacheEntryRemovedException

use of org.apache.ignite.internal.processors.cache.GridCacheEntryRemovedException in project ignite by apache.

the class GridDhtGetFuture method getAsync.

/**
 * @param keys Keys to get.
 * @return Future for local get.
 */
@SuppressWarnings({ "unchecked", "IfMayBeConditional" })
private IgniteInternalFuture<Collection<GridCacheEntryInfo>> getAsync(final Map<KeyCacheObject, Boolean> keys) {
    if (F.isEmpty(keys))
        return new GridFinishedFuture<Collection<GridCacheEntryInfo>>(Collections.<GridCacheEntryInfo>emptyList());
    String taskName0 = cctx.kernalContext().job().currentTaskName();
    if (taskName0 == null)
        taskName0 = cctx.kernalContext().task().resolveTaskName(taskNameHash);
    final String taskName = taskName0;
    GridCompoundFuture<Boolean, Boolean> txFut = null;
    ReaderArguments readerArgs = null;
    if (addReaders && !skipVals && !cctx.localNodeId().equals(reader)) {
        for (Map.Entry<KeyCacheObject, Boolean> k : keys.entrySet()) {
            if (!k.getValue())
                continue;
            while (true) {
                GridDhtCacheEntry e = cache().entryExx(k.getKey(), topVer);
                try {
                    if (e.obsolete())
                        continue;
                    boolean addReader = !e.deleted();
                    if (addReader) {
                        e.unswap(false);
                        // we have to add reader again later.
                        if (readerArgs == null)
                            readerArgs = new ReaderArguments(reader, msgId, topVer);
                    }
                    // Register reader. If there are active transactions for this entry,
                    // then will wait for their completion before proceeding.
                    // TODO: IGNITE-3498:
                    // TODO: What if any transaction we wait for actually removes this entry?
                    // TODO: In this case seems like we will be stuck with untracked near entry.
                    // TODO: To fix, check that reader is contained in the list of readers once
                    // TODO: again after the returned future completes - if not, try again.
                    IgniteInternalFuture<Boolean> f = addReader ? e.addReader(reader, msgId, topVer) : null;
                    if (f != null) {
                        if (txFut == null)
                            txFut = new GridCompoundFuture<>(CU.boolReducer());
                        txFut.add(f);
                    }
                    break;
                } catch (IgniteCheckedException err) {
                    return new GridFinishedFuture<>(err);
                } catch (GridCacheEntryRemovedException ignore) {
                    if (log.isDebugEnabled())
                        log.debug("Got removed entry when getting a DHT value: " + e);
                } finally {
                    cctx.evicts().touch(e, topVer);
                }
            }
        }
        if (txFut != null)
            txFut.markInitialized();
    }
    IgniteInternalFuture<Map<KeyCacheObject, EntryGetResult>> fut;
    if (txFut == null || txFut.isDone()) {
        fut = cache().getDhtAllAsync(keys.keySet(), readerArgs, readThrough, subjId, taskName, expiryPlc, skipVals, recovery);
    } else {
        final ReaderArguments args = readerArgs;
        // If we are here, then there were active transactions for some entries
        // when we were adding the reader. In that case we must wait for those
        // transactions to complete.
        fut = new GridEmbeddedFuture<>(txFut, new C2<Boolean, Exception, IgniteInternalFuture<Map<KeyCacheObject, EntryGetResult>>>() {

            @Override
            public IgniteInternalFuture<Map<KeyCacheObject, EntryGetResult>> apply(Boolean b, Exception e) {
                if (e != null)
                    throw new GridClosureException(e);
                return cache().getDhtAllAsync(keys.keySet(), args, readThrough, subjId, taskName, expiryPlc, skipVals, recovery);
            }
        });
    }
    if (fut.isDone()) {
        if (fut.error() != null)
            onDone(fut.error());
        else
            return new GridFinishedFuture<>(toEntryInfos(fut.result()));
    }
    return new GridEmbeddedFuture<>(new C2<Map<KeyCacheObject, EntryGetResult>, Exception, Collection<GridCacheEntryInfo>>() {

        @Override
        public Collection<GridCacheEntryInfo> apply(Map<KeyCacheObject, EntryGetResult> map, Exception e) {
            if (e != null) {
                onDone(e);
                return Collections.emptyList();
            } else
                return toEntryInfos(map);
        }
    }, fut);
}