Created
March 22, 2014 17:17
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DI with partials
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function Dispatcher(){ | |
var handlers = {} | |
this.register = function(queryExecutorDescriptor){ | |
handlers[queryExecutorDescriptor['for']] = queryExecutorDescriptor.retrieve; | |
} | |
this.dispatch = function(query, params){ | |
var handle = handlers[query] | |
if (handle){ | |
return handle(params); | |
} | |
throw new Exception(query + ' doesn\'t managed') | |
} | |
} | |
var dispatcher = new Dispatcher(); | |
function findLuckyStuffs(stuffsRepository, query){ | |
console.log(query) | |
return stuffsRepository.findLuckyStuffs() | |
} | |
var stuffsRepository = { | |
findLuckyStuffs: function(){ | |
return ['de', 'culo'] | |
}, | |
findAllStuffs: function(){ | |
return 'a lot of results' | |
} | |
} | |
dispatcher.register({ | |
'for': 'LuckyStuffs', | |
retrieve: function dependencyInjection(message){ | |
findLuckyStuffs(stuffsRepository, message) | |
} | |
}) | |
console.log(dispatcher.dispatch('LuckyStuffs', 'Bucio')) | |
function inTransaction(queryExecutor){ | |
var transactionOpened = false | |
return function(query){ | |
transactionOpened = true | |
var result = queryExecutor(query) | |
transactionOpened = false | |
return result | |
} | |
} | |
function log(queryExecutor){ | |
return function(message){ | |
console.log('Looking for: ' + message) | |
return queryExecutor(message) | |
} | |
} | |
function findAllStuffs(stuffsRepository, query){ | |
return stuffsRepository.findAllStuffs() | |
} | |
dispatcher.register({ | |
'for': 'AllStuffs', | |
retrieve: inTransaction(log(function(message){ | |
return findAllStuffs(stuffsRepository, message) | |
})) | |
}) | |
console.log(dispatcher.dispatch('AllStuffs' , 'gattini')) | |
function safeQuery(queryExecutor) { | |
return function(message){ | |
if (message == 'gattini'){ | |
throw new Exception('Query not accepted') | |
} | |
else { | |
return queryExecutor(message) | |
} | |
} | |
} | |
dispatcher.register({ | |
'for': 'ImprovedAllStuffs', | |
retrieve: safeQuery(inTransaction(log(function(message){ | |
return findAllStuffs(stuffsRepository, message) | |
}))) | |
}) | |
try { | |
dispatcher.dispatch('ImprovedAllStuffs', 'gattini') | |
} | |
catch (e){ | |
console.log('gattini banned!') | |
} |
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