268 lines
7.2 KiB
Text
268 lines
7.2 KiB
Text
|
/*
|
||
|
|
* EmerGen(e)tic 0.8
|
||
|
|
* Copyright © 2017 Ben Goldsworthy (rumperuu)
|
||
|
|
*
|
||
|
|
* A program to research the utility of genetic algorithms, applied to
|
||
|
|
* 'emergent' sytems.
|
||
|
|
*
|
||
|
|
* This file is part of EmerGen(e)tic.
|
||
|
|
*
|
||
|
|
* IMPROVEMENT(S): License (probably GNU GPLv3 tbh) goes here.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
** This program serves as the base for each mutated CacheHandler,
|
||
|
|
** providing the functionality that is common to all of them.
|
||
|
|
**/
|
||
|
|
|
||
|
|
/**
|
||
|
|
** @author Ben Goldsworthy (rumperuu) <bgoldsworthy96 @ gmail.com>
|
||
|
|
** @version 1.0
|
||
|
|
**/
|
||
|
|
component provides cache.CacheHandler
|
||
|
|
requires io.Output out,
|
||
|
|
data.IntUtil iu,
|
||
|
|
util.RandomInt ir,
|
||
|
|
time.Calendar ic,
|
||
|
|
time.DateUtil du,
|
||
|
|
io.File {
|
||
|
|
|
||
|
|
static CachedResponse cache[]
|
||
|
|
static int arraySize
|
||
|
|
static Mutex cacheLock
|
||
|
|
|
||
|
|
/**
|
||
|
|
** Returns a requested item from the cache.
|
||
|
|
**
|
||
|
|
** @param resource The request item filepath
|
||
|
|
** @return The item from the cache
|
||
|
|
**/
|
||
|
|
CachedResponse CacheHandler:getCachedResponse(char filePath[]) {
|
||
|
|
// Converts the filepath to an array of bytes for the file.
|
||
|
|
File fd = new File(filePath, File.FILE_ACCESS_READ)
|
||
|
|
char resource[] = fd.read(fd.getSize())
|
||
|
|
fd.close()
|
||
|
|
|
||
|
|
// Returns the item if it's in the cache.
|
||
|
|
mutex(cacheLock) {
|
||
|
|
for (int i = 0; i < arraySize; i++) {
|
||
|
|
if (cache[i].resource == resource) {
|
||
|
|
cache[i].hits++
|
||
|
|
cache[i].lastUsed = ic.getTime()
|
||
|
|
return cache[i]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return null
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
** Updates the cache if the requested item is not already present.
|
||
|
|
** If the cache is full, the method of determining the item to be
|
||
|
|
** replaced is subject to genetic mutation.
|
||
|
|
**
|
||
|
|
** @param ncr The new item to cache
|
||
|
|
**/
|
||
|
|
void CacheHandler:updateCache(CachedResponse ncr) {
|
||
|
|
mutex(cacheLock) {
|
||
|
|
// If the item is already in the cache, do nothing.
|
||
|
|
for (int i = 0; i < arraySize; i++) {
|
||
|
|
if (cache[i].resource == ncr.resource) {
|
||
|
|
cache[i].response = ncr.response
|
||
|
|
cache[i].resourceAge = ncr.resourceAge
|
||
|
|
|
||
|
|
return
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// If the item is not, it must be added.
|
||
|
|
// As `ncr` was created on another component, its details must
|
||
|
|
// be copied to avoid a read-only exception.
|
||
|
|
CachedResponse newEntry = new CachedResponse()
|
||
|
|
newEntry.command = ncr.command
|
||
|
|
newEntry.resource = ncr.resource
|
||
|
|
newEntry.resourceAge = ncr.resourceAge
|
||
|
|
newEntry.mimeType = ncr.mimeType
|
||
|
|
newEntry.response = new byte[](ncr.response)
|
||
|
|
newEntry.contentSize = ncr.contentSize
|
||
|
|
|
||
|
|
// Initialises the cache if there isn't currently one.
|
||
|
|
if (cache == null) {
|
||
|
|
cache = new CachedResponse[CacheHandler.MAX_SIZE]()
|
||
|
|
}
|
||
|
|
|
||
|
|
// If the cache is full, determines which item to replace.
|
||
|
|
if (arraySize == CacheHandler.MAX_SIZE) {
|
||
|
|
int index
|
||
|
|
|
||
|
|
// BEGIN
|
||
|
|
index = 0*3
|
||
|
|
// END
|
||
|
|
|
||
|
|
cache[index % arraySize] = newEntry
|
||
|
|
//out.println("$(debugMSG) replacing: $(iu.intToString(index))")
|
||
|
|
// Otherwise, appends the item to the end of the cache.
|
||
|
|
} else {
|
||
|
|
cache[arraySize] = newEntry
|
||
|
|
arraySize++
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
** Clears the cache completely.
|
||
|
|
**/
|
||
|
|
void CacheHandler:clearCache() {
|
||
|
|
mutex(cacheLock) {
|
||
|
|
cache = null
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**************************************************************************
|
||
|
|
* What follows are utility functions that a given chromosome of the
|
||
|
|
* `updateCache()` method may or may not call upon.
|
||
|
|
**************************************************************************/
|
||
|
|
|
||
|
|
// This method returns the index of the nth most frequently-used item in
|
||
|
|
// the cache.
|
||
|
|
int nthMostFrequentlyUsed(int n) {
|
||
|
|
int hits[]
|
||
|
|
for (int i = 0; i < arraySize; i++) hits[i] = 0
|
||
|
|
|
||
|
|
int i
|
||
|
|
int j
|
||
|
|
mutex(cacheLock) {
|
||
|
|
for (i = 0; i < arraySize; i++) {
|
||
|
|
for (j = 0; j < arraySize; j++) {
|
||
|
|
if (cache[i].hits == hits[j]) break
|
||
|
|
else if (hits[j] == 0) {
|
||
|
|
hits[j] = cache[i].hits
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int k = 0
|
||
|
|
int nthHit = 0
|
||
|
|
for (i = 0; i < j; i++) {
|
||
|
|
if (hits[i] > nthHit) {
|
||
|
|
nthHit = hits[i]
|
||
|
|
k++
|
||
|
|
}
|
||
|
|
if (k == n) break
|
||
|
|
}
|
||
|
|
|
||
|
|
int itemIndices[]
|
||
|
|
|
||
|
|
mutex(cacheLock) {
|
||
|
|
j = 0
|
||
|
|
for (i = 0; i < arraySize; i++) {
|
||
|
|
if (cache[i].hits == nthHit) itemIndices[j++] = i
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return resolve(itemIndices, "r")
|
||
|
|
}
|
||
|
|
|
||
|
|
// This method returns the index of the nth most recently-used item in
|
||
|
|
// the cache.
|
||
|
|
int nthMostRecentlyUsed(int n) {
|
||
|
|
DateTime useTimes[]
|
||
|
|
DateTime testTime = ic.getTime()
|
||
|
|
for (int i = 0; i < arraySize; i++) useTimes[i] = testTime
|
||
|
|
|
||
|
|
int i
|
||
|
|
int j
|
||
|
|
mutex(cacheLock) {
|
||
|
|
for (i = 0; i < arraySize; i++) {
|
||
|
|
for (j = 0; j < arraySize; j++) {
|
||
|
|
if (du.equal(cache[i].lastUsed, useTimes[j])) break
|
||
|
|
else if (du.equal(useTimes[j], testTime)) {
|
||
|
|
useTimes[j] = cache[i].lastUsed
|
||
|
|
break
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int k = 0
|
||
|
|
DateTime nthUseTime = ic.getTime()
|
||
|
|
for (i = 0; i < j; i++) {
|
||
|
|
if (du.after(useTimes[i], nthUseTime)) {
|
||
|
|
nthUseTime = useTimes[i]
|
||
|
|
k++
|
||
|
|
}
|
||
|
|
if (k == n) break
|
||
|
|
}
|
||
|
|
|
||
|
|
int itemIndices[]
|
||
|
|
|
||
|
|
mutex(cacheLock) {
|
||
|
|
j = 0
|
||
|
|
for (i = 0; i < arraySize; i++) {
|
||
|
|
if (du.equal(cache[i].lastUsed, nthUseTime)) itemIndices[j++] = i
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return resolve(itemIndices, "r")
|
||
|
|
}
|
||
|
|
|
||
|
|
// This method returns a random index.
|
||
|
|
int random() {
|
||
|
|
DateTime dt = ic.getTime()
|
||
|
|
int msec = dt.millisecond
|
||
|
|
ir.setSeed(msec)
|
||
|
|
return ir.get(CacheHandler.MAX_SIZE)
|
||
|
|
}
|
||
|
|
|
||
|
|
// This method resolves a multiple return in one of the methods above,
|
||
|
|
// as per the flag sent along with the list of indices.
|
||
|
|
// 'n' returns the newest, 'o' the oldest and 'r' a random index.
|
||
|
|
int resolve(int index[], char flag) {
|
||
|
|
DateTime dt = null
|
||
|
|
|
||
|
|
if (flag == "n") {
|
||
|
|
int newestItem = 0
|
||
|
|
|
||
|
|
int i = index.arrayLength-1
|
||
|
|
for (int j = 0; j < index.arrayLength; j++) {
|
||
|
|
if (dt == null) {
|
||
|
|
dt = cache[index[i]].timeAdded
|
||
|
|
newestItem = index[i]
|
||
|
|
} else {
|
||
|
|
if (du.before(dt, cache[index[i]].timeAdded)) {
|
||
|
|
dt = cache[index[i]].timeAdded
|
||
|
|
newestItem = index[i]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
i--
|
||
|
|
}
|
||
|
|
|
||
|
|
return newestItem
|
||
|
|
} else if (flag == "o") {
|
||
|
|
int oldestItem = 0
|
||
|
|
|
||
|
|
for (int i = 0; i < index.arrayLength; i++) {
|
||
|
|
if (dt == null) {
|
||
|
|
dt = cache[index[i]].timeAdded
|
||
|
|
oldestItem = index[i]
|
||
|
|
} else {
|
||
|
|
if (du.before(cache[index[i]].timeAdded, dt)) {
|
||
|
|
dt = cache[index[i]].timeAdded
|
||
|
|
oldestItem = index[i]
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return oldestItem
|
||
|
|
} else if (flag == "r") {
|
||
|
|
dt = ic.getTime()
|
||
|
|
int msec = dt.millisecond
|
||
|
|
ir.setSeed(msec)
|
||
|
|
return ir.get(index.arrayLength)
|
||
|
|
} else {
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|