@Override
public void start() {
try {
// open the data file
String location = configuration.location();
if (location == null || location.trim().length() == 0)
location = "Infinispan-SingleFileStore";
file = new File(location, ctx.getCache().getName() + ".dat");
if (!file.exists()) {
File dir = file.getParentFile();
if (!dir.mkdirs() && !dir.exists()) {
throw log.directoryCannotBeCreated(dir.getAbsolutePath());
}
}
channel = new RandomAccessFile(file, "rw").getChannel();
// initialize data structures
entries = newEntryMap();
freeList = Collections.synchronizedSortedSet(new TreeSet<FileEntry>());
// check file format and read persistent state if enabled for the cache
byte[] header = new byte[MAGIC.length];
if (channel.read(ByteBuffer.wrap(header), 0) == MAGIC.length
&& Arrays.equals(MAGIC, header)) {
rebuildIndex();
processFreeEntries();
} else clear(); // otherwise (unknown file format or no preload) just reset the file
// Initialize the fragmentation factor
fragmentationFactor = configuration.fragmentationFactor();
} catch (Exception e) {
throw new PersistenceException(e);
}
}
/**
* Try to evict an entry if the capacity of the cache store is reached.
*
* @return FileEntry to evict, or null (if unbounded or capacity is not yet reached)
*/
private FileEntry evict() {
if (configuration.maxEntries() > 0) {
synchronized (entries) {
if (entries.size() > configuration.maxEntries()) {
Iterator<FileEntry> it = entries.values().iterator();
FileEntry fe = it.next();
it.remove();
return fe;
}
}
}
return null;
}
private void writeFileStore(
XMLExtendedStreamWriter writer, SingleFileStoreConfiguration configuration)
throws XMLStreamException {
writer.writeStartElement(Element.FILE_STORE);
configuration.attributes().write(writer);
writeCommonStoreSubAttributes(writer, configuration);
writeCommonStoreElements(writer, configuration);
writer.writeEndElement();
}
private <Key> Map<Key, FileEntry> newEntryMap() {
// only use LinkedHashMap (LRU) for entries when cache store is bounded
final Map<Key, FileEntry> entryMap;
Equivalence<Object> keyEq =
ctx.getCache().getCacheConfiguration().dataContainer().keyEquivalence();
if (configuration.maxEntries() > 0)
entryMap = CollectionFactory.makeLinkedMap(16, 0.75f, true, null, null);
else entryMap = CollectionFactory.makeMap(keyEq, AnyEquivalence.<FileEntry>getInstance());
return Collections.synchronizedMap(entryMap);
}