GridDhtTopologyFuture.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.internal.processors.cache.distributed.dht;

import java.util.Collection;
import org.apache.ignite.internal.IgniteInternalFuture;
import org.apache.ignite.internal.processors.affinity.AffinityTopologyVersion;
import org.apache.ignite.internal.processors.cache.GridCacheContext;
import org.jetbrains.annotations.Nullable;

/**
 * Future that implements a barrier after which dht topology is safe to use. Topology is considered to be
 * safe to use when all transactions that involve moving primary partitions are completed and partition map
 * exchange is also completed.
 * <p/>
 * When new new transaction is started, it will wait for this future before acquiring new locks on particular
 * topology version.
 */
public interface GridDhtTopologyFuture extends IgniteInternalFuture<AffinityTopologyVersion> {
    /**
     * Gets topology version of this future.
     *
     * @return Topology version.
     */
    public AffinityTopologyVersion topologyVersion();

    /**
     * Returns error is cache topology is not valid.
     *
     * @param cctx Cache context.
     * @param recovery {@code True} if cache operation is done in recovery mode. Then it will only check
     *      for cache active state and topology validator result.
     * @param read {@code True} if validating read operation, {@code false} if validating write.
     * @param key Key (optimization to avoid collection creation).
     * @param keys Keys involved in a cache operation.
     * @return valid ot not.
     */
    @Nullable public Throwable validateCache(
        GridCacheContext cctx,
        boolean recovery,
        boolean read,
        @Nullable Object key,
        @Nullable Collection<?> keys);
}