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Copy pathexer07d-data-server.cpp
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83 lines (57 loc) · 1.74 KB
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/*
THE DATA SERVER PROBLEM
Version D: Solving the problem using a blocking queue
*/
#include <iostream>
#include <string>
#include <vector>
#include <unistd.h>
#include "mylib-blockingqueue.hpp"
using namespace std;
struct ProcessFilesArg {
const vector<string> * lstFileName;
mylib::BlockingQueue<string> * blkq;
};
void checkAuthUser() {
cout << "[ Auth ] Start" << endl;
// Send request to authenticator, check permissions, encrypt, decrypt...
sleep(20);
cout << "[ Auth ] Done" << endl;
}
void* processFiles(void* argVoid) {
auto arg = (ProcessFilesArg*) argVoid;
auto&& lstFileName = *arg->lstFileName;
auto&& blkq = *arg->blkq;
for (auto&& fileName : lstFileName) {
// Read file
cout << "[ ReadFile ] Start " << fileName << endl;
sleep(10);
cout << "[ ReadFile ] Done " << fileName << endl;
blkq.put(fileName); // You may put file data here
// Write log into disk
sleep(5);
cout << "[ WriteLog ]" << endl;
}
return nullptr;
pthread_exit(nullptr);
}
void processRequest() {
const vector<string> lstFileName = { "foo.html", "bar.json" };
mylib::BlockingQueue<string> blkq;
pthread_t tid;
ProcessFilesArg arg = { &lstFileName, &blkq };
// The server checks auth user while reading files, concurrently
pthread_create(&tid, nullptr, &processFiles, &arg);
checkAuthUser();
// The server waits for completion of loading files
for (size_t i = lstFileName.size(); i > 0; --i) {
blkq.take();
}
cout << "\nNow user is authorized and files are loaded" << endl;
cout << "Do other tasks...\n" << endl;
pthread_join(tid, nullptr);
}
int main() {
processRequest();
return 0;
}