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+/*
+ This file is part of ethereum.js.
+
+ ethereum.js is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ ethereum.js is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with ethereum.js. If not, see <http://www.gnu.org/licenses/>.
+*/
+/** @file providermanager.js
+ * @authors:
+ * Jeffrey Wilcke <jeff@ethdev.com>
+ * Marek Kotewicz <marek@ethdev.com>
+ * Marian Oancea <marian@ethdev.com>
+ * Gav Wood <g@ethdev.com>
+ * @date 2014
+ */
+
+var web3 = require('./web3'); // jshint ignore:line
+
+/**
+ * Provider manager object prototype
+ * It's responsible for passing messages to providers
+ * If no provider is set it's responsible for queuing requests
+ * It's also responsible for polling the ethereum node for incoming messages
+ * Default poll timeout is 12 seconds
+ * If we are running ethereum.js inside ethereum browser, there are backend based tools responsible for polling,
+ * and provider manager polling mechanism is not used
+ */
+var ProviderManager = function() {
+ this.polls = [];
+ this.provider = undefined;
+ this.id = 1;
+
+ var self = this;
+ var poll = function () {
+ if (self.provider) {
+ self.polls.forEach(function (data) {
+ data.data._id = self.id;
+ self.id++;
+ var result = self.provider.send(data.data);
+
+ result = JSON.parse(result);
+
+ // dont call the callback if result is not an array, or empty one
+ if (result.error || !(result.result instanceof Array) || result.result.length === 0) {
+ return;
+ }
+
+ data.callback(result.result);
+ });
+ }
+ setTimeout(poll, 1000);
+ };
+ poll();
+};
+
+/// sends outgoing requests
+ProviderManager.prototype.send = function(data) {
+
+ data.args = data.args || [];
+ data._id = this.id++;
+
+ if (this.provider === undefined) {
+ console.error('provider is not set');
+ return null;
+ }
+
+ //TODO: handle error here?
+ var result = this.provider.send(data);
+ result = JSON.parse(result);
+
+ if (result.error) {
+ console.log(result.error);
+ return null;
+ }
+
+ return result.result;
+};
+
+/// setups provider, which will be used for sending messages
+ProviderManager.prototype.set = function(provider) {
+ this.provider = provider;
+};
+
+/// this method is only used, when we do not have native qt bindings and have to do polling on our own
+/// should be callled, on start watching for eth/shh changes
+ProviderManager.prototype.startPolling = function (data, pollId, callback) {
+ this.polls.push({data: data, id: pollId, callback: callback});
+};
+
+/// should be called to stop polling for certain watch changes
+ProviderManager.prototype.stopPolling = function (pollId) {
+ for (var i = this.polls.length; i--;) {
+ var poll = this.polls[i];
+ if (poll.id === pollId) {
+ this.polls.splice(i, 1);
+ }
+ }
+};
+
+module.exports = ProviderManager;
+