/
Callbacks.java
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/
Callbacks.java
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package org.rapidoid.concurrent;
import org.rapidoid.RapidoidThing;
import org.rapidoid.lambda.Mapper;
import org.rapidoid.log.Log;
import java.util.concurrent.CountDownLatch;
/*
* #%L
* rapidoid-commons
* %%
* Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
* %%
* 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.
* #L%
*/
/**
* @author Nikolche Mihajlovski
* @since 4.1.0
*/
public class Callbacks extends RapidoidThing {
public static <T> void done(Callback<T> callback, T result, Throwable error) {
if (callback != null) {
try {
callback.onDone(result, error);
} catch (Exception e) {
Log.error("Callback error", e);
}
}
}
public static <T> void success(Callback<T> callback, T result) {
done(callback, result, null);
}
public static <T> void error(Callback<T> callback, Throwable error) {
done(callback, null, error);
}
public static <FROM, TO> Callback<FROM> mapping(final Callback<TO> callback, final Mapper<FROM, TO> mapper) {
return new Callback<FROM>() {
@Override
public void onDone(FROM result, Throwable error) throws Exception {
TO mapped = error == null ? mapper.map(result) : null;
Callbacks.done(callback, mapped, error);
}
};
}
public static <T> Callback<T> countDown(final CountDownLatch latch) {
return new Callback<T>() {
@Override
public void onDone(T result, Throwable error) throws Exception {
latch.countDown();
}
};
}
}