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collection.js
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collection.js
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let EventType = require('./eventType'),
UniqueIndex = require('./unique');
function Collection(name, client) {
let log = [],
data = [],
snapshots = [],
sorted = {},
unique = {
id: UniqueIndex('id')
},
exact = {},
views = {},
listeners = {
['' + EventType.INSERT]: []
};
return {
id: name,
client: client,
emit: function (eventName, arg) {
listeners[eventName].forEach((listener) => {
listener(arg);
});
},
insert: function (record) {
let event = genInsertEvent(name, client, data);
record.id = event.id;
log.push(event);
data.push(record);
unique.id.set(record);
this.emit(EventType.INSERT, event);
},
get: (value, field) => {
let f = field || 'id';
return unique[f].get(value);
},
on: function (eventName, callback) {
console.log(eventName, listeners, listeners[eventName]);
listeners[eventName].push(callback);
}
};
}
function generateEvent(type, channel, client, data) {
return Object.freeze({
id: `${channel}:${new Date().getTime()}~${client}`,
type: type,
channel: channel,
client: client,
data: data
});
}
function genInsertEvent(channel, client, data) {
return generateEvent(EventType.INSERT, channel, client, data);
}
function genUpdateEvent(channel, client, data) {
return generateEvent(EventType.UPDATE, channel, client, data);
}
function genReadEvent(channel, client, data) {
return generateEvent(EventType.READ, channel, client, data);
}
function genDeleteEvent(channel, client, data) {
return generateEvent(EventType.DELETE, channel, client, data);
}
function genRejectEvent(channel, client, data) {
return generateEvent(EventType.REJECT, channel, client, data);
}
module.exports = Collection;