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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 com.datastax.oss.driver.internal.core.util.concurrent;
import com.datastax.oss.driver.internal.core.util.Loggers;
import com.datastax.oss.driver.shaded.netty.util.concurrent.Future;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Utility methods to log unexpected exceptions in asynchronous tasks.
*
* Use this whenever you execute a future callback to apply side effects, but throw away the
* future itself:
*
*
{@code
* CompletionStage futureFoo = FooFactory.build();
*
* futureFoo
* .whenComplete((f, error) -> { handler code with side effects })
* // futureFoo is not propagated, do this or any unexpected error in the handler will be
* // swallowed
* .exceptionally(UncaughtExceptions::log);
*
* // If you return the future, you don't need it (but it's up to the caller to handle a failed
* // future)
* return futureFoo.whenComplete(...)
* }
*/
public class UncaughtExceptions {
private static final Logger LOG = LoggerFactory.getLogger(UncaughtExceptions.class);
public static void log(Future future) {
if (!future.isSuccess() && !future.isCancelled()) {
Loggers.warnWithException(LOG, "Uncaught exception in scheduled task", future.cause());
}
}
@SuppressWarnings("TypeParameterUnusedInFormals") // type parameter is only needed for chaining
public static T log(Throwable t) {
Loggers.warnWithException(LOG, "Uncaught exception in scheduled task", t);
return null;
}
}