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BeanWithFailOverflowStrategy.java
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BeanWithFailOverflowStrategy.java
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/*
* Copyright (c) 2020, 2021 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* Licensed 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.eclipse.microprofile.reactive.messaging.tck.channel.overflow;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.eclipse.microprofile.reactive.messaging.Channel;
import org.eclipse.microprofile.reactive.messaging.Emitter;
import org.eclipse.microprofile.reactive.messaging.Incoming;
import org.eclipse.microprofile.reactive.messaging.OnOverflow;
import org.eclipse.microprofile.reactive.messaging.Outgoing;
import org.eclipse.microprofile.reactive.streams.operators.PublisherBuilder;
import org.eclipse.microprofile.reactive.streams.operators.ReactiveStreams;
import jakarta.annotation.PreDestroy;
import jakarta.enterprise.context.ApplicationScoped;
import jakarta.inject.Inject;
@ApplicationScoped
public class BeanWithFailOverflowStrategy {
private final ExecutorService executor = Executors.newSingleThreadExecutor();
@PreDestroy
public void terminate() {
executor.shutdown();
}
@Inject
@Channel("hello")
@OnOverflow(value = OnOverflow.Strategy.FAIL)
private Emitter<String> emitter;
private List<String> output = new CopyOnWriteArrayList<>();
private volatile Throwable downstreamFailure;
private Exception callerException;
public List<String> output() {
return output;
}
public Throwable failure() {
return downstreamFailure;
}
public Exception exception() {
return callerException;
}
public void emitThree() {
try {
emitter.send("1");
emitter.send("2");
emitter.send("3");
emitter.complete();
} catch (Exception e) {
callerException = e;
}
}
public void emitALotOfItems() {
new Thread(() -> {
try {
for (int i = 1; i < 1000; i++) {
emitter.send("" + i);
}
} catch (Exception e) {
callerException = e;
}
}).start();
}
@Incoming("hello")
@Outgoing("out")
public PublisherBuilder<String> consume(final PublisherBuilder<String> values) {
return values
.via(ReactiveStreams.<String>builder().flatMapCompletionStage(s -> CompletableFuture.supplyAsync(() -> {
try {
Thread.sleep(1);
} catch (InterruptedException ignored) {
Thread.currentThread().interrupt();
}
return s;
}, executor))).onError(err -> downstreamFailure = err);
}
@Incoming("out")
public void out(String s) {
output.add(s);
}
}