FileSponge/src/main/java/org/warp/filesponge/FileSponge.java

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/*
* FileSponge
* Copyright (C) 2021 Andrea Cavalli
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package org.warp.filesponge;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.warp.commonutils.log.Logger;
import org.warp.commonutils.log.LoggerFactory;
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import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
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import reactor.core.scheduler.Schedulers;
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public class FileSponge implements URLsHandler {
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private static final Logger logger = LoggerFactory.getLogger(FileSponge.class);
public static final int BLOCK_SIZE = 1024 * 1024; // 1 MiB
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private final Set<URLsHandler> urlsHandlers = new ConcurrentHashMap<URLsHandler, Object>().keySet(new Object());
private final Set<URLsDiskHandler> cacheAccess = new ConcurrentHashMap<URLsDiskHandler, Object>().keySet(new Object());
private final Set<URLsWriter> cacheWrite = new ConcurrentHashMap<URLsWriter, Object>().keySet(new Object());
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public FileSponge() {
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}
public Mono<Void> registerSource(URLsHandler urLsHandler) {
return Mono.fromRunnable(() -> urlsHandlers.add(urLsHandler));
}
public <T extends URLsDiskHandler & URLsWriter> Mono<Void> registerCache(T urlsCache) {
return Mono.fromRunnable(() -> {
cacheAccess.add(urlsCache);
cacheWrite.add(urlsCache);
});
}
@Override
public Flux<DataBlock> requestContent(URL url) {
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AtomicBoolean alreadyPrintedDebug = new AtomicBoolean(false);
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return Flux
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.fromStream(cacheAccess::stream)
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.map(urlsHandler -> urlsHandler.requestContent(url))
.collectList()
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.flatMapMany(monos -> FileSpongeUtils.firstWithValueFlux(monos))
.doOnNext(dataBlock -> {
if (alreadyPrintedDebug.compareAndSet(false, true)) {
logger.debug("File \"{}\" content has been found in the cache", url);
}
})
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.switchIfEmpty(Flux
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.fromStream(urlsHandlers::stream)
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.doOnSubscribe(s -> logger.debug("Downloading file \"{}\" content", url))
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.map(urlsHandler -> urlsHandler
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.requestContent(url)
.flatMapSequential(dataBlock -> Flux
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.fromStream(cacheWrite::stream)
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.flatMapSequential(cw -> cw.writeContentBlock(url, dataBlock))
.then(Mono.just(dataBlock))
)
)
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.collectList()
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.flatMapMany(monos -> FileSpongeUtils.firstWithValueFlux(monos))
.doOnComplete(() -> logger.debug("Downloaded file \"{}\" content", url))
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)
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.distinct(DataBlock::getId)
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.doOnDiscard(DataBlock.class, DataBlock::release)
.doOnDiscard(Flux.class, f -> {
//noinspection unchecked
Flux<DataBlock> flux = (Flux<DataBlock>) f;
flux.doOnNext(DataBlock::release).subscribeOn(Schedulers.single()).subscribe();
});
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}
@Override
public Mono<Metadata> requestMetadata(URL url) {
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return Flux
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.fromStream(cacheAccess::stream)
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.map(urlsHandler -> urlsHandler.requestMetadata(url))
.collectList()
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.flatMap(monos -> FileSpongeUtils.firstWithValueMono(monos))
.doOnSuccess(metadata -> {
if (metadata != null) {
logger.debug("File \"{}\" metadata has been found in the cache", url);
}
})
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.switchIfEmpty(Flux
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.fromStream(urlsHandlers::stream)
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.doOnSubscribe(s -> logger.debug("Downloading file \"{}\" metadata", url))
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.map(urlsHandler -> urlsHandler
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.requestMetadata(url)
.flatMap(dataBlock -> Flux
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.fromStream(cacheWrite::stream)
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.flatMapSequential(cw -> cw.writeMetadata(url, dataBlock))
.then(Mono.just(dataBlock))
)
)
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.collectList()
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.flatMap(monos -> FileSpongeUtils.firstWithValueMono(monos))
.doOnSuccess(s -> {
if (s != null) {
logger.debug("Downloaded file \"{}\" metadata", url);
} else {
logger.debug("File \"{}\" metadata has not been found anywhere", url);
}
})
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);
}
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}