diffusion/src/node_modules/routing/topic-cache-datatype-entry.js

Diffusion JavaScript client

var TopicCacheEntry = require('routing/topic-cache-entry');

module.exports = function DatatypeCacheEntry(streams, path, details, specification, datatype) {
    TopicCacheEntry.call(this, streams, path, details, specification);

    var value;
    var buffer;

    this.handleValue = function(received, registry, errorHandler) {
        var oldValue = value;

        try {
            value = datatype.readValue(received);
            buffer = received;
            this.notifyValue(received, oldValue, value, registry);
        } catch (e) {
            errorHandler(e);
        }
    };

    this.handleDelta = function(received, registry, errorHandler) {
        var oldValue = value;
        var deltaType;

        try {
            deltaType = datatype.deltaType("binary");

            var delta = deltaType.readDelta(received);
            value = deltaType.apply(oldValue, delta);
            buffer = datatype.writeValue(value);

            this.notifyDelta(received, delta, oldValue, value, registry);
        } catch (e) {
            errorHandler(e);
        }
    };

    this.notifyValueToNewStream = function(path, details, specification, stream) {
        if (buffer) {
            stream.onValue(path, details, specification, buffer, null, value);
        }
    };
};