org.apache.pulsar.functions.api.examples.AsyncContextFunction Maven / Gradle / Ivy
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package org.apache.pulsar.functions.api.examples;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;
import org.apache.pulsar.functions.api.Context;
import org.apache.pulsar.functions.api.Function;
import org.slf4j.Logger;
public class AsyncContextFunction implements Function> {
@Override
public CompletableFuture process(String input, Context context) {
Logger log = context.getLogger();
CompletableFuture future = new CompletableFuture();
// this method only delay a function execute.
Executors.newCachedThreadPool().submit(() -> {
try {
Thread.sleep(500);
} catch (Exception e) {
log.error("Exception when Thread.sleep", e);
future.completeExceptionally(e);
}
String inputTopics = context.getInputTopics().stream().collect(Collectors.joining(", "));
String funcName = context.getFunctionName();
String logMessage = String.format("A message with value of \"%s\" has arrived on "
+ "one of the following topics: %s %n", input, inputTopics);
log.info(logMessage);
String metricName = String.format("function-%s-messages-received", funcName);
context.recordMetric(metricName, 1);
future.complete(null);
});
return future;
}
}