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package mill.client;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import java.util.concurrent.locks.ReentrantLock;
public class Locks{
public Lock processLock;
public Lock serverLock;
public Lock clientLock;
public static Locks files(String lockBase) throws Exception{
return new Locks(){{
processLock = new FileLock(lockBase + "/pid");
serverLock = new FileLock(lockBase + "/serverLock");
clientLock = new FileLock(lockBase + "/clientLock");
}};
}
public static Locks memory(){
return new Locks(){{
this.processLock = new MemoryLock();
this.serverLock = new MemoryLock();
this.clientLock = new MemoryLock();
}};
}
}
class FileLocked implements Locked{
private java.nio.channels.FileLock lock;
public FileLocked(java.nio.channels.FileLock lock){
this.lock = lock;
}
public void release() throws Exception{
this.lock.release();
}
}
class FileLock extends Lock{
String path;
RandomAccessFile raf;
FileChannel chan;
public FileLock(String path) throws Exception{
this.path = path;
raf = new RandomAccessFile(path, "rw");
chan = raf.getChannel();
}
public Locked lock() throws Exception{
return new FileLocked(chan.lock());
}
public Locked tryLock() throws Exception{
java.nio.channels.FileLock l = chan.tryLock();
if (l == null) return null;
else return new FileLocked(l);
}
public boolean probe()throws Exception{
java.nio.channels.FileLock l = chan.tryLock();
if (l == null) return false;
else {
l.release();
return true;
}
}
}
class MemoryLocked implements Locked{
java.util.concurrent.locks.Lock l;
public MemoryLocked(java.util.concurrent.locks.Lock l){
this.l = l;
}
public void release() throws Exception{
l.unlock();
}
}
class MemoryLock extends Lock{
ReentrantLock innerLock = new ReentrantLock(true);
public boolean probe(){
return !innerLock.isLocked();
}
public Locked lock() {
innerLock.lock();
return new MemoryLocked(innerLock);
}
public Locked tryLock() {
if (innerLock.tryLock()) return new MemoryLocked(innerLock);
else return null;
}
}
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