[GitHub] [ignite] NSAmelchev commented on a change in pull request #6937: IGNITE-12186 TDE - Phase-2. Master key rotation.

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NSAmelchev commented on a change in pull request #6937: IGNITE-12186 TDE - Phase-2. Master key rotation.
URL: https://github.com/apache/ignite/pull/6937#discussion_r352513581
 
 

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 File path: modules/core/src/main/java/org/apache/ignite/internal/util/distributed/DistributedProcess.java
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+/*
+ * 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.util.distributed;
+
+import java.io.Serializable;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Function;
+import org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.cluster.ClusterNode;
+import org.apache.ignite.failure.FailureContext;
+import org.apache.ignite.internal.GridKernalContext;
+import org.apache.ignite.internal.GridTopic;
+import org.apache.ignite.internal.IgniteInternalFuture;
+import org.apache.ignite.internal.managers.encryption.GridEncryptionManager;
+import org.apache.ignite.internal.processors.affinity.AffinityTopologyVersion;
+import org.apache.ignite.internal.util.GridConcurrentHashSet;
+import org.apache.ignite.internal.util.future.GridFutureAdapter;
+import org.apache.ignite.internal.util.typedef.CI3;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.internal.util.typedef.internal.U;
+import org.jetbrains.annotations.Nullable;
+
+import static org.apache.ignite.events.EventType.EVT_NODE_FAILED;
+import static org.apache.ignite.events.EventType.EVT_NODE_LEFT;
+import static org.apache.ignite.failure.FailureType.CRITICAL_ERROR;
+import static org.apache.ignite.internal.managers.communication.GridIoPolicy.SYSTEM_POOL;
+
+/**
+ * Distributed process is a cluster-wide process that accumulates single nodes results to finish itself.
+ * <p>
+ * The process consists of the following phases:
+ * <ol>
+ *  <li>Initial request starts process. (Sent via discovery)</li>
+ *  <li>Each server node process an initial request and send the single node result to the coordinator. (Sent via
+ *  communication)</li>
+ *  <li>The coordinator accumulate all single nodes results and finish process. (Sent via discovery)</li>
+ * </ol>
+ * <p>
+ * Several processes of one type can be started at the same time.
+ *
+ * @param <I> Request type.
+ * @param <R> Result type.
+ */
+public class DistributedProcess<I extends Serializable, R extends Serializable> {
+    /** Process type. */
+    private final DistributedProcessType type;
+
+    /** Active processes. */
+    private final ConcurrentHashMap<UUID, Process> processes = new ConcurrentHashMap<>(1);
+
+    /** Synchronization mutex for coordinator initializing and the remaining collection operations. */
+    private final Object mux = new Object();
+
+    /** Kernal context. */
+    private final GridKernalContext ctx;
+
+    /** Logger. */
+    private final IgniteLogger log;
+
+    /**
+     * @param ctx Kernal context.
+     * @param type Process type.
+     * @param exec Execute action and returns future with the single node result to send to the coordinator.
+     * @param finish Finish process closure. Called on each node when all single nodes results received.
+     */
+    public DistributedProcess(GridKernalContext ctx, DistributedProcessType type,
+        Function<I, IgniteInternalFuture<R>> exec,
+        CI3<UUID, Map<UUID, R>, Map<UUID, Exception>> finish) {
+        this.ctx = ctx;
+        this.type = type;
+
+        log = ctx.log(getClass());
+
+        ctx.discovery().setCustomEventListener(InitMessage.class, (topVer, snd, msg) -> {
 
 Review comment:
   Could you tell API for removal, please?

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