Interview Question for SDE-2s


Country: United States




Comment hidden because of low score. Click to expand.
0
of 0 vote

#include <string>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <map>
#include <thread>
#include <list>
#include <chrono>

using namespace std;

class Cache {
map <string, time_t> CacheItems;

public:
void add(string url, time_t timeoutSeconds)
{
timeoutSeconds += time(NULL);
CacheItems[url] = timeoutSeconds;
cout << "Added ==> " << url << ": " << timeoutSeconds << endl;
}

void eraseTimedOut() {
time_t now = time(NULL);
cout << now << endl;
list<string> expiredCacheItems;
for (auto iItem = CacheItems.rbegin(); iItem != CacheItems.rend(); ++iItem) {
if (0 >= difftime(iItem->second, now)) {
cout << "Expired: " << iItem->first << endl;
expiredCacheItems.push_back(iItem->first);
}
}
if (!expiredCacheItems.empty()) {
for (auto expiredItem : expiredCacheItems) {
CacheItems.erase(expiredItem);
}
expiredCacheItems.clear();
}
}

bool empty() {
return CacheItems.empty();
}

volatile static bool AbortCache;

static void waitForCacheExpiry()
{
Cache CacheItems;
CacheItems.add("google", 6);
CacheItems.add("quickexpire", 3);
CacheItems.add("myurl", 12);

while ((!CacheItems.empty()) && (!AbortCache)) {
this_thread::sleep_for(chrono::milliseconds(1000));
CacheItems.eraseTimedOut();
}
}
};

volatile bool Cache::AbortCache = false;

int main()
{
Cache c;
thread cacheExpiry(c.waitForCacheExpiry);
cacheExpiry.join();
string line;
cout << "Press enter to close.";
getline(cin, line);
return 0;
}

- Omkar June 17, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

#include <string>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <map>
#include <thread>
#include <list>
#include <chrono>

using namespace std;

class Cache {
map <string, time_t> CacheItems;

public:
void add(string url, time_t timeoutSeconds)
{
timeoutSeconds += time(NULL);
CacheItems[url] = timeoutSeconds;
cout << "Added ==> " << url << ": " << timeoutSeconds << endl;
}

void eraseTimedOut() {
time_t now = time(NULL);
cout << now << endl;
list<string> expiredCacheItems;
for (auto iItem = CacheItems.rbegin(); iItem != CacheItems.rend(); ++iItem) {
if (0 >= difftime(iItem->second, now)) {
cout << "Expired: " << iItem->first << endl;
expiredCacheItems.push_back(iItem->first);
}
}
if (!expiredCacheItems.empty()) {
for (auto expiredItem : expiredCacheItems) {
CacheItems.erase(expiredItem);
}
expiredCacheItems.clear();
}
}

bool empty() {
return CacheItems.empty();
}

volatile static bool AbortCache;

static void waitForCacheExpiry()
{
Cache CacheItems;
CacheItems.add("google", 6);
CacheItems.add("quickexpire", 3);
CacheItems.add("myurl", 12);

while ((!CacheItems.empty()) && (!AbortCache)) {
this_thread::sleep_for(chrono::milliseconds(1000));
CacheItems.eraseTimedOut();
}
}
};

volatile bool Cache::AbortCache = false;

int main()
{
Cache c;
thread cacheExpiry(c.waitForCacheExpiry);
cacheExpiry.join();
string line;
cout << "Press enter to close.";
getline(cin, line);
return 0;
}

- Omkar June 17, 2017 | Flag Reply
Comment hidden because of low score. Click to expand.
0
of 0 vote

Please ignore earlier unformatted posts.. For some reason links are not allowed. Had to remove data and format the code..

#include <string>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <map>
#include <thread>
#include <list>
#include <chrono>

using namespace std;

class Cache {
	map <string, time_t> CacheItems;

public:
	void add(string url, time_t timeoutSeconds)
	{
		timeoutSeconds += time(NULL);
		CacheItems[url] = timeoutSeconds;
		cout << "Added ==> " << url << ": " << timeoutSeconds << endl;
	}

	void eraseTimedOut() {
		time_t now = time(NULL);
		cout << now << endl;
		list<string> expiredCacheItems;
		for (auto iItem = CacheItems.rbegin(); iItem != CacheItems.rend(); ++iItem) {
			if (0 >= difftime(iItem->second, now)) {
				cout << "Expired: " << iItem->first << endl;
				expiredCacheItems.push_back(iItem->first);
			}
		}
		if (!expiredCacheItems.empty()) {
			for (auto expiredItem : expiredCacheItems) {
				CacheItems.erase(expiredItem);
			}
			expiredCacheItems.clear();
		}
	}

	bool empty() {
		return CacheItems.empty();
	}

	volatile static bool AbortCache;

	static void waitForCacheExpiry()
	{
		Cache CacheItems;
		CacheItems.add("google", 6);
		CacheItems.add("quickexpire", 3);
		CacheItems.add("myurl", 12);

		while ((!CacheItems.empty()) && (!AbortCache)) {
			this_thread::sleep_for(chrono::milliseconds(1000));
			CacheItems.eraseTimedOut();
		}
	}
};

volatile bool Cache::AbortCache = false;

int main()
{
	Cache c;
	thread cacheExpiry(c.waitForCacheExpiry);
	cacheExpiry.join();
	string line;
	cout << "Press enter to close.";
	getline(cin, line);
	return 0;
}

- Omkar June 17, 2017 | Flag Reply


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