/*
* 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.filesystem.volume;
import com.google.common.base.Optional;
import io.vertx.core.logging.Logger;
import org.sfs.SfsVertx;
import org.sfs.filesystem.BlockFile;
import org.sfs.filesystem.ChecksummedPositional;
import rx.Observable;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import static com.google.common.base.Optional.absent;
import static com.google.common.base.Optional.of;
import static com.google.common.collect.FluentIterable.from;
import static io.vertx.core.buffer.Buffer.buffer;
import static io.vertx.core.logging.LoggerFactory.getLogger;
import static java.lang.String.format;
import static org.sfs.block.RangeLock.Lock;
import static org.sfs.protobuf.XVolume.XIndexBlock;
import static org.sfs.protobuf.XVolume.XIndexBlock.parseFrom;
public class IndexFile {
private static final Logger LOGGER = getLogger(IndexFile.class);
private final BlockFile blockFile;
public IndexFile(Path path, int blockSize) {
blockFile = new BlockFile(path, blockSize);
}
public long getWriteQueueSize() {
return blockFile.getWriteQueueSize();
}
public long getWriteQueueLowWater() {
return blockFile.getWriteQueueLowWater();
}
public long getWriteQueueMaxWrites() {
return blockFile.getWriteQueueMaxWrites();
}
public int getBlockSize() {
return blockFile.getBlockSize();
}
public Observable<Void> close(SfsVertx vertx) {
return blockFile.close(vertx);
}
public Observable<Void> disableWrites(SfsVertx vertx) {
return blockFile.disableWrites(vertx);
}
public Observable<Void> enableWrites(SfsVertx vertx) {
return blockFile.enableWrites(vertx);
}
public int getLockCount() {
return blockFile.getLockCount();
}
public Observable<Optional<ChecksummedPositional<XIndexBlock>>> getBlock(SfsVertx vertx, long position) {
return blockFile.getBlock(vertx, position)
.filter(Optional::isPresent)
.map(Optional::get)
.map(this::parse)
.doOnNext(checksummedPositionalOptional -> {
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(format("Block @ position %d was %s", position, checksummedPositionalOptional));
}
})
.singleOrDefault(absent());
}
public Observable<Iterable<ChecksummedPositional<XIndexBlock>>> getBlocks(SfsVertx vertx, long position, int numberOfBlocks) {
return blockFile.getBlocks(vertx, position, numberOfBlocks)
.map(checksummedPositionals ->
from(checksummedPositionals)
.transform(input -> parse(input))
.filter(Optional::isPresent)
.transform(Optional::get));
}
public Observable<Void> open(SfsVertx vertx, StandardOpenOption openOption, StandardOpenOption... openOptions) {
return blockFile.open(vertx, openOption, openOptions);
}
public Observable<Void> setBlock(SfsVertx vertx, long position, XIndexBlock data) {
return blockFile.setBlock(vertx, position, buffer(data.toByteArray()));
}
public Observable<Long> size(SfsVertx vertx) {
return blockFile.size(vertx);
}
public Optional<Lock> tryReadLock(long position, long length) {
return blockFile.tryReadLock(position, length);
}
public Optional<Lock> tryWriteLock(long position, long length) {
return blockFile.tryWriteLock(position, length);
}
public Observable<Void> force(SfsVertx vertx, boolean metaData) {
return blockFile.force(vertx, metaData);
}
protected Optional<ChecksummedPositional<XIndexBlock>> parse(ChecksummedPositional<byte[]> checksummedPositional) {
try {
if (checksummedPositional.isChecksumValid()) {
byte[] frame = checksummedPositional.getValue();
if (frame != null && frame.length > 0) {
XIndexBlock indexBlock = parseFrom(frame);
return of(new ChecksummedPositional<XIndexBlock>(checksummedPositional.getPosition(), indexBlock, checksummedPositional.getActualChecksum()) {
@Override
public boolean isChecksumValid() {
return true;
}
});
}
}
LOGGER.warn("Invalid checksum for index block @ position " + checksummedPositional.getPosition());
return absent();
} catch (Throwable e) {
LOGGER.warn("Error parsing index block @ position " + checksummedPositional.getPosition(), e);
return absent();
}
}
}