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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <sys/time.h>
#include <time.h>
#include "util.h"
#include <stdbool.h>
#include <unistd.h>
#include <signal.h>
#define MAX_THREADS 100
#define MAX_queue_len 100
#define MAX_CE 100
#define INVALID -1
#define BUFF_SIZE 1024
/*
THE CODE STRUCTURE GIVEN BELOW IS JUST A SUGGESTION. FEEL FREE TO MODIFY AS NEEDED
*/
// structs:
typedef struct request_queue {
int fd;
char *request;
} request_t;
typedef struct cache_entry {
int len;
char *request;
char *content;
} cache_entry_t;
/* ******************** Dynamic Pool Code [Extra Credit A] **********************/
// Extra Credit: This function implements the policy to change the worker thread pool dynamically
// depending on the number of requests
void * dynamic_pool_size_update(void *arg) {
while(1) {
// Run at regular intervals
// Increase / decrease dynamically based on your policy
}
}
/**********************************************************************************/
/* ************************ Cache Code [Extra Credit B] **************************/
// Function to check whether the given request is present in cache
int getCacheIndex(char *request){
/// return the index if the request is present in the cache
}
// Function to add the request and its file content into the cache
void addIntoCache(char *mybuf, char *memory , int memory_size){
// It should add the request at an index according to the cache replacement policy
// Make sure to allocate/free memory when adding or replacing cache entries
}
// clear the memory allocated to the cache
void deleteCache(){
// De-allocate/free the cache memory
}
// Function to initialize the cache
void initCache(){
// Allocating memory and initializing the cache array
}
/**********************************************************************************/
/* ************************************ Utilities ********************************/
// Function to get the content type from the request
char* getContentType(char * mybuf) {
// Should return the content type based on the file type in the request
// (See Section 5 in Project description for more details)
}
// Function to open and read the file from the disk into the memory
// Add necessary arguments as needed
int readFromDisk(/*necessary arguments*/) {
// Open and read the contents of file given the request
}
/**********************************************************************************/
// Function to receive the request from the client and add to the queue
void * dispatch(void *arg) {
while (1) {
// Accept client connection
// Get request from the client
// Add the request into the queue
}
return NULL;
}
/**********************************************************************************/
// Function to retrieve the request from the queue, process it and then return a result to the client
void * worker(void *arg) {
while (1) {
// Get the request from the queue
// Get the data from the disk or the cache (extra credit B)
// Log the request into the file and terminal
// return the result
}
return NULL;
}
/**********************************************************************************/
int main(int argc, char **argv) {
// Error check on number of arguments
if(argc != 8){
printf("usage: %s port path num_dispatcher num_workers dynamic_flag queue_length cache_size\n", argv[0]);
return -1;
}
// Get the input args
int port = argv[3];
char* path = argv[4];
int dispatchers = argv[5];
int workers = argv[6];
int dynFlag = argv[7];
int qLen = argv[8];
int cSiz = argv[9];
// Perform error checks on the input arguments
if (port < 1025 || port > 65535) {
perror("Invalid port. Port must be greater than 1024 or less than 65536.\n");
return -1;
}
if (dispatchers > MAX_THREADS || dispatchers < 1) {
perror("Number of dispatchers is invalid. It must be greater than 0 or less than 101.\n");
return -1;
}
if (workers > MAX_THREADS || workers < 1) {
perror("Number of dispatchers is invalid. It must be greater than 0 or less than 101.\n");
return -1;
}
if (qLen > MAX_queue_len || qLen <= 0) {
perror("Queue length is invalid.\n");
return -1;
}
// Change SIGINT action for grace termination
// Open log file
// Change the current working directory to server root directory
// Initialize cache (extra credit B)
// Start the server
// Create dispatcher and worker threads (all threads should be detachable)
// Create dynamic pool manager thread (extra credit A)
// Terminate server gracefully
// Print the number of pending requests in the request queue
// close log file
// Remove cache (extra credit B)
return 0;
}
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