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feat: Add Flow/Sink#foldWhile operator. (#1012)

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He-Pin(kerr) 2024-01-22 19:14:34 +08:00 • committed by GitHub
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39
docs/src/test/java/jdocs/stream/operators/flow/FoldWhile.java Normal file
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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 jdocs.stream.operators.flow;
// #imports
import org.apache.pekko.actor.ActorSystem;
import org.apache.pekko.stream.javadsl.Source;
// #imports
public class FoldWhile {
private static final ActorSystem system = null;
private void foldWhileUsage() {
// #foldWhile
Source.range(1, 10)
.foldWhile(0, acc -> acc < 10, Integer::sum)
.runForeach(System.out::println, system);
// Expect prints:
// 100
// #foldWhile
}
}

39
docs/src/test/java/jdocs/stream/operators/sink/FoldWhile.java Normal file
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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 jdocs.stream.operators.sink;
import org.apache.pekko.actor.ActorSystem;
import org.apache.pekko.stream.javadsl.Sink;
import org.apache.pekko.stream.javadsl.Source;
public class FoldWhile {
private ActorSystem system = null;
public void foldWhileUsage() throws Exception {
// #foldWhile
final int result =
Source.range(1, 10)
.runWith(Sink.foldWhile(0, acc -> acc < 10, Integer::sum), system)
.toCompletableFuture()
.get();
System.out.println(result);
// Expect prints:
// 10
// #foldWhile
}
}