Berkof commented on a change in pull request #191: URL: https://github.com/apache/ignite-3/pull/191#discussion_r675104949
########## File path: modules/client/src/main/java/org/apache/ignite/internal/client/ReliableChannel.java ########## @@ -0,0 +1,621 @@ +/* + * 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.client; + +import java.net.InetSocketAddress; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Random; +import java.util.Set; +import java.util.UUID; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.locks.ReadWriteLock; +import java.util.concurrent.locks.ReentrantReadWriteLock; +import java.util.function.BiFunction; +import java.util.function.Consumer; +import java.util.function.Function; +import java.util.stream.Collectors; +import java.util.stream.IntStream; + +import org.apache.ignite.client.IgniteClientAuthenticationException; +import org.apache.ignite.client.IgniteClientConfiguration; +import org.apache.ignite.client.IgniteClientConnectionException; +import org.apache.ignite.client.IgniteClientException; +import org.apache.ignite.internal.client.io.ClientConnectionMultiplexer; +import org.apache.ignite.internal.client.io.netty.NettyClientConnectionMultiplexer; + +/** + * Communication channel with failover and partition awareness. + */ +public final class ReliableChannel implements AutoCloseable { + /** Do nothing helper function. */ + private static final Consumer<Integer> DO_NOTHING = (v) -> {}; + + /** Channel factory. */ + private final BiFunction<ClientChannelConfiguration, ClientConnectionMultiplexer, ClientChannel> chFactory; + + /** Client channel holders for each configured address. */ + private volatile List<ClientChannelHolder> channels; + + /** Index of the current channel. */ + private volatile int curChIdx = -1; + + /** Client configuration. */ + private final IgniteClientConfiguration clientCfg; + + /** Node channels. */ + private final Map<UUID, ClientChannelHolder> nodeChannels = new ConcurrentHashMap<>(); + + /** Channels reinit was scheduled. */ + private final AtomicBoolean scheduledChannelsReinit = new AtomicBoolean(); + + /** Channel is closed. */ + private volatile boolean closed; + + /** Fail (disconnect) listeners. */ + private final ArrayList<Runnable> chFailLsnrs = new ArrayList<>(); + + /** Guard channels and curChIdx together. */ + private final ReadWriteLock curChannelsGuard = new ReentrantReadWriteLock(); + + /** Connection manager. */ + private final ClientConnectionMultiplexer connMgr; + + /** Cache addresses returned by {@code ThinClientAddressFinder}. */ + private volatile String[] prevHostAddrs; + + /** + * Constructor. + * + * @param chFactory Channel factory. + * @param clientCfg Client config. + */ + ReliableChannel(BiFunction<ClientChannelConfiguration, ClientConnectionMultiplexer, ClientChannel> chFactory, + IgniteClientConfiguration clientCfg) { + if (chFactory == null) + throw new NullPointerException("chFactory"); + + if (clientCfg == null) + throw new NullPointerException("clientCfg"); + + this.clientCfg = clientCfg; + this.chFactory = chFactory; + + connMgr = new NettyClientConnectionMultiplexer(); + connMgr.start(); + } + + /** {@inheritDoc} */ + @Override public synchronized void close() { + closed = true; + + connMgr.stop(); + + List<ClientChannelHolder> holders = channels; + + if (holders != null) { + for (ClientChannelHolder hld: holders) + hld.close(); + } + } + + /** + * Sends request and handles response asynchronously. + * + * @param opCode Operation code. + * @param payloadWriter Payload writer. + * @param payloadReader Payload reader. + * @param <T> response type. + * @return Future for the operation. + */ + public <T> CompletableFuture<T> serviceAsync( + int opCode, + PayloadWriter payloadWriter, + PayloadReader<T> payloadReader + ) { + CompletableFuture<T> fut = new CompletableFuture<>(); + + // Use the only one attempt to avoid blocking async method. + handleServiceAsync(fut, opCode, payloadWriter, payloadReader, 1, null); + + return fut; + } + + private <T> void handleServiceAsync(final CompletableFuture<T> fut, + int opCode, + PayloadWriter payloadWriter, + PayloadReader<T> payloadReader, + int attemptsLimit, + IgniteClientConnectionException failure) { + ClientChannel ch; + // Workaround to store used attempts value within lambda body. + var attemptsCnt = new int[1]; + + try { + ch = applyOnDefaultChannel(channel -> channel, attemptsLimit, v -> attemptsCnt[0] = v ); + } catch (Throwable ex) { Review comment: NL -- This is an automated message from the Apache Git Service. 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