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https://github.com/bspeice/itcs3146-project
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Added NextFit Algorithm
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dpturnbull
296
NextFit.java
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296
NextFit.java
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@ -0,0 +1,296 @@
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/* David P. Turnbull
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ITCS3146
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group project
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this class sets up a First Fit memory scheme
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*/
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//this section sets up the Car class
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class NextFit implements baseAlgorithm
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{
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//this section sets up the private elements of the class
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private int jobId,
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jobSize,
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jobTime,
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startLoc,
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endLoc,
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blkSize,
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memSize = memoryManagement.memory,
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active,
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noJobs=0,
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s1=0,
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currentPosition=0,
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positionToCompress=0,
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loopCount,
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compMemTest=0,
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tableEntries=1;
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private int[] tempVal = new int[6];
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private int[][] memTable = new int[memSize+2][6];
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private int[] memory = new int[memSize];
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//this is a no argument constructor
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public NextFit()
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{
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memTable[0][0]=0; //job number
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memTable[0][1]=0; //job size
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memTable[0][2]=0; //start location in memory
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memTable[0][3]=memSize-1; //end location in memory
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memTable[0][4]=memSize; //mem blk size size
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memTable[0][5]=-1; //status, 0=not active, 1=active, -1=special
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}
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//this method sets the job up
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public void allocate(int ID, int size, int jTime)
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{
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jobId = ID;
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jobSize = size;
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jobTime = jTime;
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noJobs++;
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s1=0;
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loopCount=0;
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//checks to see if the job will fit in memory
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if(jobSize>memSize)
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{
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System.out.println("\n\n*********************************************************"+
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" THIS JOB IS TO LARGE TO FIT INTO MEMORY"+
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"*********************************************************");
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System.exit(0);
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}
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//this section looks for a place to put the new job
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do
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{
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if(memTable[currentPosition][5]==-1 && memTable[currentPosition][4]>=jobSize &&
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memTable[currentPosition][3]==memSize-1)
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{
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//runs only for the first job
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if(noJobs==1)
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{
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memTable[currentPosition][0] = jobId;
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memTable[currentPosition][1] = jobSize;
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memTable[currentPosition][2] = 0;
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memTable[currentPosition][3] = jobSize-1;
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memTable[currentPosition][4] = memTable[0][3]-memTable[0][2]+1;
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memTable[currentPosition][5] = 1;
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fillMemory(jobId, jobSize, memTable[currentPosition][2]);
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memTable[currentPosition+1][0] = 0;
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memTable[currentPosition+1][1] = 0;
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memTable[currentPosition+1][2] = memTable[currentPosition][3]+1;
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memTable[currentPosition+1][3] = memSize-1;
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memTable[currentPosition+1][4] = memSize-memTable[currentPosition+1][2];
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memTable[currentPosition+1][5] = -1;
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currentPosition++;
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positionToCompress=currentPosition;
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tableEntries++;
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s1=memSize*2;
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}
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//runs after the first job and if the only available slot is at the end of memory
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else
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{
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memTable[currentPosition][0] = jobId;
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memTable[currentPosition][1] = jobSize;
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memTable[currentPosition][2] = memTable[currentPosition-1][3]+1;
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memTable[currentPosition][3] = jobSize+memTable[currentPosition][2]-1;
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memTable[currentPosition][4] = memTable[currentPosition][3]-memTable[currentPosition][2]+1;
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memTable[currentPosition][5] = 1;
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fillMemory(jobId, jobSize, memTable[currentPosition][2]);
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memTable[currentPosition+1][0] = 0;
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memTable[currentPosition+1][1] = 0;
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memTable[currentPosition+1][2] = memTable[currentPosition][3]+1;
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memTable[currentPosition+1][3] = memSize-1;
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memTable[currentPosition+1][4] = memSize-memTable[currentPosition+1][2];
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memTable[currentPosition+1][5] = -1;
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tableEntries++;
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currentPosition++;
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positionToCompress=currentPosition;
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s1=memSize*2;
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}
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}
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//checks for first available free block that has been deallocated
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else if(memTable[currentPosition][4]>=jobSize && memTable[currentPosition][5]==0)
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{
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memTable[currentPosition][0] = jobId;
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memTable[currentPosition][1] = jobSize;
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memTable[currentPosition][5] = 1;
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fillMemory(jobId, jobSize, memTable[currentPosition][2]);
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currentPosition++;
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positionToCompress=currentPosition;
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s1=memSize*2;
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}
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else if(currentPosition==tableEntries-1)
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{
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currentPosition=0;
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s1++;
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}
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else
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{
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s1++;
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currentPosition++;
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}
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}while(s1<tableEntries);
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//if job will not fit this section will compress memory and try placing the job again
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if(s1==tableEntries)
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{
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noJobs=noJobs-1;
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compMem();
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currentPosition=0;
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positionToCompress=0;
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allocate(ID, size, jobTime);
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}
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}
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//this method is used if you want to deallocate a job by jobId
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public void removeJob(int ID)
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{
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jobId = ID;
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s1=0;
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do
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{
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if(memTable[s1][0] == jobId)
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{
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jobSize = memTable[s1][1];
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startLoc = memTable[s1][2];
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s1=memSize*2;
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}
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else
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{
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s1++;
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}
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}while (s1<tableEntries);
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deallocate(jobSize, startLoc);
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}
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//this method removes a job it does not check to see if the job exisits
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public void deallocate(int jobSize, int beginningLocation)
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//public void removeJob(int ID)
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{
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jobId = 0;
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jobSize = jobSize;
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startLoc = beginningLocation;
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s1=0;
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do
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{
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if(memTable[s1][2] == startLoc)
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{
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memTable[s1][0] = 0;
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memTable[s1][1] = 0;
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memTable[s1][5] = 0;
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s1=memSize*2;
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jobId=-1;
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noJobs--;
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}
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else
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{
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s1++;
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}
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}while (s1<tableEntries);
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}
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//this method compacts the memory
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public void compMem()
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{
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System.out.println("***********************enter compress************************");
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compMemTest=tableEntries;
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for(int c=0; c<=compMemTest; c++)
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{
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//this section checks to see if two unused blks are next to each other and then
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//comdines them
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if(memTable[c][5]==0 && memTable[c+1][5]==0)
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{
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tempVal[0] = memTable[c+1][0];
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tempVal[1] = memTable[c+1][1];
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tempVal[2] = memTable[c+1][2];
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tempVal[3] = memTable[c+1][3];
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tempVal[4] = memTable[c+1][4];
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tempVal[5] = memTable[c+1][5];
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memTable[c+1][0]=-1;
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memTable[c+1][1]=-1;
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memTable[c+1][2]=-1;
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memTable[c+1][3]=-1;
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memTable[c+1][4]=-1;
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memTable[c+1][5]=-1;
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memTable[c][0]=0;
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memTable[c][1]=0;
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memTable[c][3]=tempVal[3];
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memTable[c][4]=memTable[c][4]+tempVal[4];
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memTable[c][5]=0;
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//this loop shifts the remaining jobs up
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for(int srt=c+1; srt<tableEntries; srt++)
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{
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memTable[srt][0]=memTable[srt+1][0];
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memTable[srt][1]=memTable[srt+1][1];
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memTable[srt][2]=memTable[srt+1][2];
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memTable[srt][3]=memTable[srt+1][3];
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memTable[srt][4]=memTable[srt+1][4];
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memTable[srt][5]=memTable[srt+1][5];
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}
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memTable[tableEntries-1][0]=-1;
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memTable[tableEntries-1][1]=-1;
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memTable[tableEntries-1][2]=-1;
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memTable[tableEntries-1][3]=-1;
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memTable[tableEntries-1][4]=-1;
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memTable[tableEntries-1][5]=-1;
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c--;
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}
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}
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s1=0;
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for(int c1=0; c1<tableEntries; c1++)
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{
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if(memTable[c1][0]==-1)
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{
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s1++;
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}
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}
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tableEntries=tableEntries-s1;
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if(memTable[tableEntries-2][5]==0 && memTable[tableEntries-1][5]==-1)
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{
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memTable[tableEntries-2][3]=memTable[tableEntries-1][3];
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memTable[tableEntries-2][4]=memTable[tableEntries-1][4]+memTable[tableEntries-2][4];
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memTable[tableEntries-2][5]=-1;
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tableEntries--;
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}
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currentPosition = 0;
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positionToCompress = 0;
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}
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//this method fills the memory location with the data
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private void fillMemory(int job, int size, int start)
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{
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jobId=job;
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jobSize=size;
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startLoc=start;
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for(int fillCount=startLoc; fillCount<jobSize+startLoc; fillCount++)
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{
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memory[fillCount]=jobId;
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}
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}
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//this method returns a String of all the elements stored in the object
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public String toString()
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{
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String str;
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str = ("\n\nJob ID\tJob Size\tStart Loc\tEnd Loc\tMem Blk Size\tStatus");
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for(int cnt=0; cnt<tableEntries; cnt++)
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{
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str = (str+"\n"+memTable[cnt][0]+"\t"+memTable[cnt][1]+"\t\t"+memTable[cnt][2]+"\t\t"+
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memTable[cnt][3]+"\t\t"+memTable[cnt][4]+"\t"+memTable[cnt][5]);
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}
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return str;
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}
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}
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@ -9,6 +9,8 @@ import java.util.StringTokenizer;
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public class memoryManagement{
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public static int memory = 1024;
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public static void main(String args[])throws Exception{
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final int JOBAMOUNT = 1000;
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final int MEMORYSIZE = 10000;
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