trmsmy

Design A Vending Machine 

A vending machine has Products (snacks) stacked in "Product Slots". Each "Product Slot" has an ID which is TWO DIGIT number, a PRICE. 
Vending machine has a "coin slot", which can take NICKLE, DIME or QUATER only. 
Vending machine has a keypad has follwing keys 
	* KEY 0 to 9 to pick Product Slot ID 
	* CLEAR is to clear your selection 
	* ENTER key is used to confirm your Product selection if credit is available
	* DONE key is return any balance or deposited coins

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https://www.detroitlabs.com/blog/2019/08/01/building-dynamic-environment-variables-from-docker-for-a-single-page-app/

https://stackoverflow.com/questions/25862071/accessing-os-environment-variables-from-jinja2-template

trmsmy

   52  mv minikube-v1.3.0.iso ~/.minikube/cache/iso
      53  sudo apt-get install docker.io 
      
      
         55  docker 
   56  docker ps 
   57  sudo systemctl start docker
   58  sudo systemctl  status docker 
   
   echo $USER

trmsmy

import boto3
import boto3.dynamodb.types
import json

# Load the service resources in the desired region.
session = boto3.Session(profile_name='default')
dynamodb = session.resource('dynamodb', region_name="ap-south-1")
kinesis = session.client('kinesis', region_name="ap-south-1")

# Set names for ddb table and ks stream

trmsmy

package com.lca.phoenix.lcc;

/*
 * Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright

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import static org.junit.Assert.*;
import static org.hamcrest.CoreMatchers.is;

import static org.mockito.Mockito.*;
import static org.mockito.BDDMockito.*;

import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import org.hamcrest.Matcher;

trmsmy

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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<?xml version="1.0" encoding="UTF-8" standalone="no"?><templates><template autoinsert="true" context="java-members" deleted="false" description="tear down after test" enabled="true" name="after">@${afterType:newType(org.junit.After)}
public void tearDown() throws Exception {
    ${cursor}
}</template></templates>

trmsmy

import org.springframework.boot.context.embedded.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.access.AccessDecisionVoter;
import org.springframework.security.access.vote.AffirmativeBased;
import org.springframework.security.access.vote.RoleVoter;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.ProviderManager;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;

trmsmy

2018-02-23 23:10:18.365 DEBUG [config-service,,,] 8212 --- [nio-8888-exec-1] o.s.c.sleuth.instrument.web.TraceFilter  : Received a request to uri [/service2] that should not be sampled [true]
2018-02-23 23:10:18.369 DEBUG [config-service,,,] 8212 --- [nio-8888-exec-1] o.s.c.sleuth.instrument.web.TraceFilter  : Found a parent span b927ff4389efc6c0/b927ff4389efc6c0 in the request
2018-02-23 23:10:18.369 DEBUG [config-service,,,] 8212 --- [nio-8888-exec-1] o.s.c.sleuth.instrument.web.TraceFilter  : Parent span is NoopSpan{context=b927ff4389efc6c0/b927ff4389efc6c0}
2018-02-23 23:10:18.398 DEBUG [config-service,b927ff4389efc6c0,b927ff4389efc6c0,false] 8212 --- [nio-8888-exec-1] o.s.c.s.i.web.TraceHandlerInterceptor    : Handling span NoopSpan{context=b927ff4389efc6c0/b927ff4389efc6c0}
2018-02-23 23:10:18.399 DEBUG [config-service,b927ff4389efc6c0,b927ff4389efc6c0,false] 8212 --- [nio-8888-exec-1] o.s.c.s.i.web.TraceHandlerInterceptor    : Adding a method tag with value [echo] to a span NoopSpan{context=b927ff4389e