dabasajay

Basics

1. Entities:

• Resources
• Permissions
• Users
• Roles or Groups

2. Resources requires (1 or more) Permissions
3. Roles are collection of (1 or more) Permissions

dabasajay

• Advantages

  • Diverse teams
  • More scalability as we can scale individual services as much as we want by adding more instances
  • Could provide better control over internet traffic
  • Better fault isolation as if one microservice fails, others can still operate to some/full extent
  • Smaller and faster deployments

• Disadvantages

  • Communication between services is complex, error-prone and vulnerable to external conditions like network latency, etc.

• Global testing is difficult as we need to make sure each individual service is up and running without issues

dabasajay

• Is TCP protocol stateless? Why HTTP is stateless while TCP is not?

• Stateful and Stateless protocols

• Network protocols

• TCP 3-way handshake - Hussein Nasser

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• The OSI Model by Example - Hussein Nasser

• TCP vs UDP Crash Course - Hussein Nasser

• When to use UDP vs TCP - Hussein Nasser

• TCP over IP - TCP/IP

dabasajay

version: '3.7'
services:
  redis:
    image: 'redis'
    ports:
      # Host : Container
      - 6379:6379
    volumes:
      - './host/data/redis:/var/lib/redis/data'
  mongodb:

dabasajay

1
2

dabasajay

1
1549
983
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873
827
53
1207
359
560

dabasajay

{
	"user_name": "",
	"num_solved": 0,
	"num_total": 1788,
	"ac_easy": 0,
	"ac_medium": 0,
	"ac_hard": 0,
	"stat_status_pairs": [
		{
			"stat": {

dabasajay

• Rewrites and proxies
  • History pushstate and single-page apps
  • Proxy to another service
  • Custom headers in proxy redirects
• Redirect options
  • HTTP status codes
  • Custom 404 page handling
  • Query parameters
  • Domain-level redirects
• Redirect by country or language

dabasajay

#define ll long long
#define pi pair<ll, ll>
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename T, typename S> ostream& operator<<(ostream& os, const pair<T, S>& p) {os << "(" << p.first << ", " << p.second << ")";return os;}
template <typename T> ostream& operator<<(ostream& os, const vector<T>& v) {os << "[";for (auto i : v) os << i << " ";os << "\b]";return os;}
template <typename T> ostream& operator<<(ostream& os, const multiset<T>& s) {os << "{";for (auto i : s) os << i << " ";os << "\b}";return os; }
template <typename T> ostream& operator<<(ostream& os, const set<T>& s) {os << "{";for (auto i : s) os << i << " ";os << "\b}";return os; }
template <typename T> ostream& operator<<(ostream& os, const unordered_set<T>& s) {os << "{";for (auto i : s) os << i << " ";os << "\b}";return os; }
template <typename T1, typename T2> ostream& operator<<(ostream& os, const map<T1, T2>& s) {for (auto i : s) os << i << endl;return os; }
template <typename T1, typename T2> ostream& operator<<(ostream&