/*
* Copyright 2016 The Simple File Server Authors
*
* 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.sfs.io;
import io.vertx.core.logging.Logger;
import org.sfs.SfsVertx;
import org.sfs.rx.ObservableFuture;
import org.sfs.rx.RxHelper;
import rx.Observable;
import rx.functions.Func1;
import java.util.Set;
import static com.google.common.base.Joiner.on;
import static io.vertx.core.logging.LoggerFactory.getLogger;
public class WaitForActiveWriters implements Func1<Void, Observable<Void>> {
private static final Logger LOGGER = getLogger(WaitForActiveWriters.class);
private final SfsVertx vertx;
private final Set<? extends BufferEndableWriteStream> writers;
public WaitForActiveWriters(SfsVertx vertx, Set<? extends BufferEndableWriteStream> writers) {
this.vertx = vertx;
this.writers = writers;
}
@Override
public Observable<Void> call(Void aVoid) {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Waiting for Active Writers " + on(", ").join(writers));
}
ObservableFuture<Void> handler = RxHelper.observableFuture();
if (hasActive()) {
vertx.setPeriodic(100, event -> {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Waiting for Active Writers " + on(", ").join(writers));
}
if (!hasActive()) {
vertx.cancelTimer(event);
handler.complete(null);
}
});
} else {
handler.complete(null);
}
return handler
.map(aVoid1 -> {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("Done waiting for Active Writers " + on(", ").join(writers));
}
return null;
});
}
protected boolean hasActive() {
return !writers.isEmpty();
}
}