121 lines
4.1 KiB
Java
121 lines
4.1 KiB
Java
/*
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* FileSponge
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* Copyright (C) 2021 Andrea Cavalli
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package org.warp.filesponge;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.atomic.AtomicBoolean;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import reactor.core.publisher.Flux;
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import reactor.core.publisher.Mono;
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public class FileSponge implements URLsHandler {
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private static final Logger logger = LoggerFactory.getLogger(FileSponge.class);
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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());
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private final Set<URLsDiskHandler> cacheAccess = new ConcurrentHashMap<URLsDiskHandler, Object>().keySet(new Object());
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private final Set<URLsWriter> cacheWrite = new ConcurrentHashMap<URLsWriter, Object>().keySet(new Object());
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public FileSponge() {
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}
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public Mono<Void> registerSource(URLsHandler urLsHandler) {
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return Mono.fromRunnable(() -> urlsHandlers.add(urLsHandler));
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}
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public <T extends URLsDiskHandler & URLsWriter> Mono<Void> registerCache(T urlsCache) {
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return Mono.fromRunnable(() -> {
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cacheAccess.add(urlsCache);
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cacheWrite.add(urlsCache);
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});
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}
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@Override
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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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.fromIterable(cacheAccess)
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.map(urlsHandler -> urlsHandler.requestContent(url))
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.collectList()
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.flatMapMany(monos -> FileSpongeUtils.firstWithValueFlux(monos))
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.doOnNext(dataBlock -> {
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if (alreadyPrintedDebug.compareAndSet(false, true)) {
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logger.debug("File \"{}\" content has been found in the cache", url);
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}
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})
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.switchIfEmpty(Flux
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.fromIterable(urlsHandlers)
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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)
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.flatMapSequential(dataBlock -> Flux
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.fromIterable(cacheWrite)
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.flatMapSequential(cw -> cw.writeContentBlock(url, dataBlock))
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.then(Mono.just(dataBlock))
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)
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)
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.collectList()
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.flatMapMany(monos -> FileSpongeUtils.firstWithValueFlux(monos))
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.doOnComplete(() -> logger.debug("Downloaded file \"{}\" content", url))
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)
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.distinct(DataBlock::getId);
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}
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@Override
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public Mono<Metadata> requestMetadata(URL url) {
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return Flux
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.fromIterable(cacheAccess)
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.map(urlsHandler -> urlsHandler.requestMetadata(url))
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.collectList()
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.flatMap(monos -> FileSpongeUtils.firstWithValueMono(monos))
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.doOnSuccess(metadata -> {
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if (metadata != null) {
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logger.debug("File \"{}\" metadata has been found in the cache", url);
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}
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})
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.switchIfEmpty(Flux
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.fromIterable(urlsHandlers)
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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)
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.flatMap(dataBlock -> Flux
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.fromIterable(cacheWrite)
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.flatMapSequential(cw -> cw.writeMetadata(url, dataBlock))
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.then(Mono.just(dataBlock))
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)
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)
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.collectList()
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.flatMap(monos -> FileSpongeUtils.firstWithValueMono(monos))
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.doOnSuccess(s -> {
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if (s != null) {
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logger.debug("Downloaded file \"{}\" metadata", url);
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} else {
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logger.debug("File \"{}\" metadata has not been found anywhere", url);
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}
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})
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);
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}
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}
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