private static void setCurrentVersion() {
myRecords.putInt(HEADER_VERSION_OFFSET, VERSION);
myRecords.putLong(HEADER_TIMESTAMP_OFFSET, System.currentTimeMillis());
myAttributes.setVersion(VERSION);
myContents.setVersion(VERSION);
myRecords.putInt(HEADER_CONNECTION_STATUS_OFFSET, SAFELY_CLOSED_MAGIC);
}
private static int getVersion() {
final int recordsVersion = myRecords.getInt(HEADER_VERSION_OFFSET);
if (myAttributes.getVersion() != recordsVersion || myContents.getVersion() != recordsVersion)
return -1;
return recordsVersion;
}
public static boolean isDirty() {
return myDirty
|| myNames.isDirty()
|| myAttributes.isDirty()
|| myContents.isDirty()
|| myRecords.isDirty();
}
private static int findAttributePage(int fileId, String attrId, boolean toWrite)
throws IOException {
checkFileIsValid(fileId);
Storage storage = getAttributesStorage();
int encodedAttrId = DbConnection.getAttributeId(attrId);
int recordId = getAttributeRecordId(fileId);
if (recordId == 0) {
if (!toWrite) return 0;
recordId = storage.createNewRecord();
setAttributeRecordId(fileId, recordId);
} else {
DataInputStream attrRefs = storage.readStream(recordId);
try {
while (attrRefs.available() > 0) {
final int attIdOnPage = DataInputOutputUtil.readINT(attrRefs);
final int attrAddress = DataInputOutputUtil.readINT(attrRefs);
if (attIdOnPage == encodedAttrId) return attrAddress;
}
} finally {
attrRefs.close();
}
}
if (toWrite) {
Storage.AppenderStream appender = storage.appendStream(recordId);
DataInputOutputUtil.writeINT(appender, encodedAttrId);
int attrAddress = storage.createNewRecord();
DataInputOutputUtil.writeINT(appender, attrAddress);
DbConnection.REASONABLY_SMALL.myAttrPageRequested = true;
try {
appender.close();
} finally {
DbConnection.REASONABLY_SMALL.myAttrPageRequested = false;
}
return attrAddress;
}
return 0;
}
public static void force() {
try {
w.lock();
if (myRecords != null) {
markClean();
}
if (myNames != null) {
myNames.force();
myAttributes.force();
myContents.force();
myRecords.force();
}
} finally {
w.unlock();
}
}
public static void flushSome() {
if (!isDirty() || HeavyProcessLatch.INSTANCE.isRunning()) return;
try {
w.lock();
if (myFlushingFuture == null) {
return; // avoid NPE when close has already taken place
}
myNames.force();
final boolean attribsFlushed = myAttributes.flushSome();
final boolean contentsFlushed = myContents.flushSome();
if (attribsFlushed && contentsFlushed) {
markClean();
myRecords.force();
}
} finally {
w.unlock();
}
}
