@Override
public synchronized FileLock tryLock(long position, long size, boolean shared)
throws IOException {
if (shared) {
if (!data.lockShared()) {
return null;
}
} else {
if (!data.lockExclusive()) {
return null;
}
}
// cast to FileChannel to avoid JDK 1.7 ambiguity
FileLock lock =
new FileLock((FileChannel) null, position, size, shared) {
@Override
public boolean isValid() {
return true;
}
@Override
public void release() throws IOException {
data.unlock();
}
};
return lock;
}
@Override
public void moveTo(FilePath newName) {
synchronized (MEMORY_FILES) {
FileNioMemData f = getMemoryFile();
f.setName(newName.name);
MEMORY_FILES.remove(name);
MEMORY_FILES.put(newName.name, f);
}
}
@Override
public FileChannel truncate(long newLength) throws IOException {
if (newLength < size()) {
data.touch(readOnly);
pos = Math.min(pos, newLength);
data.truncate(newLength);
}
return this;
}
@Override
public int write(ByteBuffer src) throws IOException {
int len = src.remaining();
if (len == 0) {
return 0;
}
data.touch(readOnly);
pos = data.readWrite(pos, src, 0 /*because we start writing from src.position()*/, len, true);
src.position(src.position() + len);
return len;
}
@Override
public int read(ByteBuffer dst) throws IOException {
int len = dst.remaining();
if (len == 0) {
return 0;
}
long newPos = data.readWrite(pos, dst, dst.position(), len, false);
len = (int) (newPos - pos);
if (len <= 0) {
return -1;
}
dst.position(dst.position() + len);
pos = newPos;
return len;
}
@Override
public String toString() {
return data.getName();
}
@Override
public long size() {
return data.length();
}