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April 5, 2018 12:42
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Adapter pattern implementation on JavaScript
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import { EOL } from 'os'; | |
interface LoggerInterface { | |
error(message: string): string | |
info(message: string): string | |
} | |
class Logger implements LoggerInterface { | |
adapter = null | |
constructor(adapter) { | |
this.adapter = adapter | |
} | |
error(message: string): string { | |
return this.adapter.error(message) | |
} | |
info(message: string): string { | |
return this.adapter.info(message) | |
} | |
} | |
class ShortTimestampLogger implements LoggerInterface { | |
logger(message, level = 'INFO') { | |
const date = new Date().toDateString() | |
return `[${date}] ${level}: ${message}${EOL}` | |
} | |
error(message: string): string { | |
return this.logger(message, 'ERROR') | |
} | |
info(message: string): string { | |
return this.logger(message, 'INFO') | |
} | |
} | |
class LongTimestampLogger implements LoggerInterface { | |
logger(message, level = 'INFO') { | |
const date = new Date().toString() | |
return `[${date}] ${level}: ${message}${EOL}` | |
} | |
error(message: string): string { | |
return this.logger(message, 'ERROR') | |
} | |
info(message: string): string { | |
return this.logger(message, 'INFO') | |
} | |
} | |
const shorterLogger = new Logger(new ShortTimestampLogger) | |
shorterLogger.info('This message use short timestamp.') | |
const longLogger = new Logger(new LongTimestampLogger) | |
shorterLogger.info('This message use long timestamp.') |
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class Storage { | |
constructor(storage) { | |
this.storage = storage | |
} | |
put(key, value) { | |
this.storage.put(key, value) | |
} | |
get(key) { | |
this.storage.get(key) | |
} | |
} | |
class LocalStorage { | |
static put(key, value) { | |
localStorage.setItem(key, value) | |
console.log('put', key, value) | |
} | |
static get(key) { | |
localStorage.getItem(key) | |
console.log('get', value) | |
} | |
} | |
class Cookie { | |
static put(key, value) { | |
console.log('put', key, value) | |
} | |
static get(key) { | |
console.log('get', value) | |
} | |
} | |
class Redis { | |
static put(key, value) { | |
console.log('put', key, value) | |
} | |
static get(key) { | |
console.log('get', value) | |
} | |
} | |
const storage = new Storage(LocalStorage) | |
storage.put('lang', 'id') | |
storage.get('lang') // Output: id |
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