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package fileIO;
import java.util.Arrays;
import shared.Shared;
import shared.Tools;
/**
* @author Brian Bushnell
* @date Jan 2, 2013
*
*/
public class LoadThread<X> extends Thread{
public static <Y> LoadThread<Y> load(String fname, Class<Y> c){
LoadThread<Y> lt=new LoadThread<Y>(fname, c);
lt.start();
return lt;
}
private LoadThread(String fname_, Class<X> c_){
fname=fname_;
c=c_;
addThread(1);
}
@Override
public void run(){
addRunningThread(1);
output=ReadWrite.read(c, fname, false);
addRunningThread(-1);
synchronized(this){this.notify();}
}
private static final int addThread(int x){
final int lim=(Shared.LOW_MEMORY ? 1 : LIMIT);
synchronized(activeThreads){
assert(x!=0);
if(x>0){
activeThreads[0]+=x;
activeThreads[1]+=x;
}else{
addRunningThread(x);
}
assert(activeThreads[0]==(activeThreads[1]+activeThreads[2]) && activeThreads[0]>=0 && activeThreads[1]>=0 &&
activeThreads[2]>=0 && activeThreads[2]<=lim) : Arrays.toString(activeThreads);
return activeThreads[0];
}
}
private static final int addRunningThread(int x){
final int lim=(Shared.LOW_MEMORY ? 1 : LIMIT);
synchronized(activeThreads){
assert(x!=0);
if(x>0){
assert(activeThreads[1]>=x);
while(activeThreads[2]>=lim){
try {
activeThreads.wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
activeThreads[1]-=x; //Remove from waiting
}else{
activeThreads[0]+=x; //Remove from active
}
activeThreads[2]+=x; //Change number running
assert(activeThreads[0]==(activeThreads[1]+activeThreads[2]) && activeThreads[0]>=0 && activeThreads[1]>=0 &&
activeThreads[2]>=0 && activeThreads[2]<=lim) : Arrays.toString(activeThreads);
if(activeThreads[2]==0 || (activeThreads[2]<lim && activeThreads[1]>0)){activeThreads.notify();}
// System.err.println(activeThreads[2]);
// try {
// activeThreads.wait(5000);
// } catch (InterruptedException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
return activeThreads[2];
}
}
public static final int countActiveThreads(){
final int lim=(Shared.LOW_MEMORY ? 1 : LIMIT);
synchronized(activeThreads){
assert(activeThreads[0]==(activeThreads[1]+activeThreads[2]) && activeThreads[0]>=0 && activeThreads[1]>=0 &&
activeThreads[2]>=0 && activeThreads[2]<=lim) : Arrays.toString(activeThreads);
return activeThreads[0];
}
}
public static final void waitForReadingToFinish(){
final int lim=(Shared.LOW_MEMORY ? 1 : LIMIT);
synchronized(activeThreads){
while(activeThreads[0]>0){
assert(activeThreads[0]==(activeThreads[1]+activeThreads[2]) && activeThreads[0]>=0 && activeThreads[1]>=0 &&
activeThreads[2]>=0 && activeThreads[2]<=lim) : Arrays.toString(activeThreads);
try {
activeThreads.wait(8000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(activeThreads[2]==0 || (activeThreads[2]<lim && activeThreads[1]>0)){activeThreads.notify();}
}
}
}
public final void waitForThisToFinish(){
if(output==null){
while(this.getState()!=State.TERMINATED){
try {
this.join();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
/** {active, waiting, running} <br>
* Active means running or waiting.
*/
public static int[] activeThreads={0, 0, 0};
private final String fname;
private final Class<X> c;
public X output=null;
private static final int[] RUNNING=new int[1];
public static int LIMIT=Tools.min(12, Tools.max(Shared.threads(), 1));
}
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