Flesh out the threaded algorithm

Conflicts:

	memoryManagement.java

Job.java

@@ -38,5 +38,9 @@ public class Job {
 		}
 	}
 	
+	public void setBeginningLocation(int newBeginning)
+	{
+		myThread.setBeginning(newBeginning);
+	}
 	
 }

NextFit.java

@@ -15,7 +15,7 @@ class NextFit implements baseAlgorithm
 					startLoc,
 					endLoc,
 					blkSize,
-					memSize = memoryManagement.memory,
+					memSize = memoryManagement.MEMORYSIZE,
 					active,
 					noJobs=0,
 					s1=0,

jobThread.java

@@ -1,8 +1,7 @@
-import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 
 public class jobThread extends Thread {
-	private final int sleepResolution = 200; //Milliseconds
+	private final int sleepResolution = 20; //Milliseconds
 	private long jobTime; //Milliseconds
 	private long elapsedTime;
 	private boolean isPaused, pauseStateChanged;
@@ -28,6 +27,10 @@ public class jobThread extends Thread {
 		this.beginningLocation = beginningLocation;
 	}
 	
+	public void setBeginning(int newBeginning){
+		this.beginningLocation = newBeginning;
+	}
+	
 	public void pause(){
 		synchronized(this){
 			isPaused = true;

memoryManagement.java

@@ -9,12 +9,11 @@ import java.util.StringTokenizer;
 
 public class memoryManagement{
 
-	public static int memory = 1024;
-
+	static final int JOBAMOUNT = 1000;
+	static final int MEMORYSIZE = 10000;
+	
 	public static void main(String args[])throws Exception{
-		final int JOBAMOUNT = 1000;
-		final int MEMORYSIZE = 10000;
-		
+				
 		File file = new File("null");
 		Scanner keyboard = new Scanner(System.in);
 		Scanner fileScan;
@@ -79,4 +78,4 @@ public class memoryManagement{
 		
 		System.out.println("Completed Successfully");
 	}
-}
+}

threadedAllocation.java

@@ -1,5 +1,9 @@
+import java.lang.reflect.Method;
+
 public class threadedAllocation implements baseAlgorithm{
 	int[] memoryBlock;
+	threadedAllocationGarbage garbageThread;
+	Job[] jobArray;
 	
 	threadedAllocation(int memorySize) {
 		/* Constructor specific for this algorithm
@@ -7,6 +11,12 @@ public class threadedAllocation implements baseAlgorithm{
 		 * Start the threaded garbage collector, and then begin
 		 * our actual operations */
 		memoryBlock = new int[memorySize];
+		
+		this.garbageThread = new threadedAllocationGarbage(this.memoryBlock, 20, this.jobArray);
+		this.garbageThread.run();
+		
+		// Set up the array of job references
+		jobArray = new Job[memoryManagement.JOBAMOUNT];
 	}
 
 	int locateBlock(int blockSize){
@@ -40,20 +50,28 @@ public class threadedAllocation implements baseAlgorithm{
 
 	public void allocate(int jobID, int jobSize, int jobLength ){
 		/* Over-rides allocate() of baseAlgorithm */
-
-		//Loop until we get a block big enough for our job
-		//	Note that this assumes we're not going to race against ourselves
-		int beginningLocation = locateBlock( jobSize );
-		while (beginningLocation == -1)
-			beginningLocation = locateBlock( jobSize );
-
-		//We've got a location, mark it as filled, and start the job.
-		for (int x = 0; x < jobSize; x++)
-		{
-			memoryBlock[beginningLocation + x] = jobID;
+		try{
+			Method deallocateMethod = this.getClass().getMethod("deallocate", new Class[]{int.class, int.class});
+			
+			//Loop until we get a block big enough for our job
+			//	Note that this assumes we're not going to race against ourselves
+			int beginningLocation = locateBlock( jobSize );
+			while (beginningLocation == -1)
+				beginningLocation = locateBlock( jobSize );
+	
+			//We've got a location, mark it as filled, and start the job.
+			for (int x = 0; x < jobSize; x++)
+			{
+				memoryBlock[beginningLocation + x] = jobID;
+			}
+	
+			//TODO: Code to start the job
+			Job newJob = new Job(jobLength, jobID, jobSize, beginningLocation, deallocateMethod, this);
+			jobArray[jobID] = newJob;
+			newJob.start();
+		} catch (Exception e){
+			System.out.println("Could not allocate job with ID " + jobID);
 		}
-
-		//TODO: Code to start the job
 	}
 
 	public void deallocate(int jobSize, int beginningLocation){

threadedAllocationGarbage.java

@@ -7,18 +7,120 @@ class threadedAllocationGarbage extends Thread
 
 	int[] memoryBlock;
 	int sleepTime;
+	Job[] jobArray;
 
-	threadedAllocationGarbage( int[] memoryBlock, int sleepTime ){
+	threadedAllocationGarbage( int[] memoryBlock, int sleepTime, Job[] jobArray ){
 		/* Set up a reference to the algorithm's memory location */
 		this.memoryBlock = memoryBlock;
 
 		/* Set up the time quantum */
 		this.sleepTime = sleepTime;
+		
+		/* Set up the array of jobs so that we can pause them as need be */
+		this.jobArray = jobArray;
+	}
+	
+	public int[] largestBlock(){
+		//Find an open location
+		int memoryLoc = 0;
+		int maxFreeSize = 0, maxFreeIndex = 0;
+		while (memoryLoc < this.memoryBlock.length)
+		{
+			if (this.memoryBlock[memoryLoc] != 0)
+				//Block isn't free
+				continue;
+
+			//One location is free, find out total size free
+			//This loop breaks either when we've found the size we need, or
+			//we found the beginning of the next block.
+			int beginningLoc = memoryLoc;
+			int free = 0;
+			while (this.memoryBlock[memoryLoc] == 0)
+			{
+				memoryLoc += 1;
+				free += 1;
+			}
+			//We've found the end of that chunk, see if it's bigger than what we have on file
+			if (free > maxFreeSize){
+				maxFreeSize = free;
+				maxFreeIndex = beginningLoc;
+			}
+		}
+		
+		//We've reached the end of memory, return what the largest block was (if we found a block)
+		if (maxFreeSize > 0)
+			return new int[]{maxFreeIndex, maxFreeSize};
+		else
+			return new int[]{-1, -1};
 	}
 
 	public void run() {
 		/* Code to run in the background */
 
-		//Sleep for sleepTime, then scan for memory to compact
+		while (true)
+		{
+			/* The way this algorithm works is to:
+			 * 		Start at the beginning of the memory block
+			 * 		Find the largest available block
+			 * 		Shift the closest job down to fill up this space
+			 * 		Repeat until deconstructed
+			 */
+			
+			int[] largestBlockInfo = largestBlock();
+			int maxFreeBeginning = largestBlockInfo[0];
+			int maxFreeSize = largestBlockInfo[1];
+			
+			if (maxFreeSize == -1)
+				//No open space found
+				continue;
+			
+			//Find out what ID the job is, and how big it is
+			int jobID = this.memoryBlock[maxFreeBeginning + maxFreeSize + 1];
+			
+			int jobSize = 0;
+			int counter = maxFreeBeginning + maxFreeSize;
+			while (this.memoryBlock[counter] == jobID){
+				counter++;
+				jobSize++;
+			}
+			
+			//Pause the job, and then relocate it
+			//Note that we need to lock out the allocation to prevent a race
+			synchronized (this.memoryBlock) {
+				//Pause the job operation
+				jobArray[jobID].pause();
+				
+				//Write the job into the free space
+				int memoryLoc = maxFreeBeginning;
+				counter = 0;
+				while (counter < jobSize){
+					memoryBlock[memoryLoc] = jobID;
+					counter++;
+				}
+				
+				//Inform the job of its new beginning location
+				jobArray[jobID].setBeginningLocation(maxFreeBeginning);
+				
+				//Restart the job
+				jobArray[jobID].resume();
+				
+				//Write the remaining memory as free
+				counter = 0;
+				while (counter < maxFreeSize){
+					memoryBlock[memoryLoc] = 0;
+				}
+				
+			}
+			//Sleep for sleepTime, then go back to the top to continue compaction
+			try {
+				sleep(sleepTime);
+			} catch (InterruptedException e) {
+				// TODO Auto-generated catch block
+				System.out.println("Error in compaction thread! Algorithm is aborting.");
+				
+				//Kill ourselves
+				this.interrupt();
+			}
+		}
 	}
 }