tkalkirill commented on code in PR #1626: URL: https://github.com/apache/ignite-3/pull/1626#discussion_r1097403190
########## modules/core/src/testFixtures/java/org/apache/ignite/internal/testframework/flow/FlowUtils.java: ########## @@ -0,0 +1,158 @@ +/* + * 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.testframework.flow; + +import java.util.ArrayList; +import java.util.List; +import java.util.NoSuchElementException; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.Flow.Publisher; +import java.util.concurrent.Flow.Subscriber; +import java.util.concurrent.Flow.Subscription; +import java.util.concurrent.ForkJoinPool; +import org.apache.ignite.internal.util.Cursor; + +/** + * Utility methods for extracting data from {@link Publisher}s. + */ +public class FlowUtils { + /** + * Subscribes to the given publisher, collecting all values into a list. + */ + public static <T> CompletableFuture<List<T>> subscribeToList(Publisher<T> publisher) { + var resultFuture = new CompletableFuture<List<T>>(); + + publisher.subscribe(new Subscriber<>() { + private final List<T> items = new ArrayList<>(); Review Comment: Discussed in private ########## modules/core/src/testFixtures/java/org/apache/ignite/internal/testframework/flow/FlowUtils.java: ########## @@ -0,0 +1,158 @@ +/* + * 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.testframework.flow; + +import java.util.ArrayList; +import java.util.List; +import java.util.NoSuchElementException; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.Flow.Publisher; +import java.util.concurrent.Flow.Subscriber; +import java.util.concurrent.Flow.Subscription; +import java.util.concurrent.ForkJoinPool; +import org.apache.ignite.internal.util.Cursor; + +/** + * Utility methods for extracting data from {@link Publisher}s. + */ +public class FlowUtils { + /** + * Subscribes to the given publisher, collecting all values into a list. + */ + public static <T> CompletableFuture<List<T>> subscribeToList(Publisher<T> publisher) { + var resultFuture = new CompletableFuture<List<T>>(); + + publisher.subscribe(new Subscriber<>() { + private final List<T> items = new ArrayList<>(); + + @Override + public void onSubscribe(Subscription subscription) { + subscription.request(Long.MAX_VALUE); + } + + @Override + public void onNext(T item) { + items.add(item); + } + + @Override + public void onError(Throwable throwable) { + resultFuture.completeExceptionally(throwable); + } + + @Override + public void onComplete() { + resultFuture.complete(items); + } + }); + + return resultFuture; + } + + /** + * Subscribes to the given publisher, extracting a single value from it. + */ + public static <T> CompletableFuture<T> subscribeToValue(Publisher<T> publisher) { + var resultFuture = new CompletableFuture<T>(); + + publisher.subscribe(new Subscriber<>() { + private Subscription subscription; + + @Override + public void onSubscribe(Subscription subscription) { + this.subscription = subscription; + + subscription.request(1); + } + + @Override + public void onNext(T item) { + resultFuture.complete(item); + + subscription.cancel(); + } + + @Override + public void onError(Throwable throwable) { + resultFuture.completeExceptionally(throwable); + } + + @Override + public void onComplete() { + resultFuture.completeExceptionally(new NoSuchElementException()); + } + }); + + return resultFuture; + } + + /** + * Creates a Publisher that provides data form a given cursor. + */ + public static <T> Publisher<T> fromCursor(Cursor<T> cursor) { + return subscriber -> subscriber.onSubscribe(new Subscription() { + private long demand; + + private boolean isStarted; + + private boolean isCancelled; Review Comment: Discussed in private -- This is an automated message from the Apache Git Service. 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