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ES6 Client API #751

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Oct 4, 2019
Merged

ES6 Client API #751

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187 changes: 97 additions & 90 deletions packages/perspective/src/js/api/client.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,114 +20,121 @@ import {bindall} from "../utils.js";
*
* @export
*/
export function Client() {
this._worker = {
initialized: {value: false},
transferable: false,
msg_id: 0,
handlers: {},
messages: []
};
bindall(this);
}
export class Client {
constructor() {
this._initialized = false;
this._worker = {
initialized: {value: false},
transferable: false,
msg_id: 0,
handlers: {},
messages: []
};
bindall(this);
}

/**
* Remove a listener for a Perspective-generated event.
*/
Client.prototype.unsubscribe = function(cmd, handler) {
for (let key of Object.keys(this._worker.handlers)) {
if (this._worker.handlers[key].resolve === handler) {
delete this._worker.handlers[key];
/**
* Remove a listener for a Perspective-generated event.
*/
unsubscribe(cmd, handler) {
for (let key of Object.keys(this._worker.handlers)) {
if (this._worker.handlers[key].resolve === handler) {
delete this._worker.handlers[key];
}
}
}
};

/**
* Process an asynchronous message.
*/
Client.prototype.post = function(msg, resolve, reject, keep_alive = false) {
if (resolve || reject) {
this._worker.handlers[++this._worker.msg_id] = {resolve, reject, keep_alive};
}
msg.id = this._worker.msg_id;
if (this._worker.initialized.value) {
this.send(msg);
} else {
this._worker.messages.push(() => this.send(msg));
/**
* Process an asynchronous message.
*/
post(msg, resolve, reject, keep_alive = false) {
if (resolve || reject) {
this._worker.handlers[++this._worker.msg_id] = {resolve, reject, keep_alive};
}
msg.id = this._worker.msg_id;
if (this._worker.initialized.value) {
this.send(msg);
} else {
this._worker.messages.push(() => this.send(msg));
}
}
};

Client.prototype.initialize_profile_thread = function() {
if (this._worker.initialized.value) {
this.send({id: -1, cmd: "init_profile_thread"});
} else {
this._worker.messages.push(() => this.send({id: -1, cmd: "init_profile_thread"}));
initialize_profile_thread() {
if (this._worker.initialized.value) {
this.send({id: -1, cmd: "init_profile_thread"});
} else {
this._worker.messages.push(() => this.send({id: -1, cmd: "init_profile_thread"}));
}
}
};

/**
* Must be implemented in order to transport commands to the server.
*/
Client.prototype.send = function() {
throw new Error("send() not implemented");
};

Client.prototype.open_table = function(name) {
return new proxy_table(this, name);
};
/**
* Must be implemented in order to transport commands to the server.
*/
send() {
throw new Error("send() not implemented");
}

Client.prototype.open_view = function(name) {
return new proxy_view(this, name);
};
/**
* Given the name of a table that is hosted on the server (e.g. using `perspective-python` or `perspective` in NodeJS),
* return a `table` instance that sends all operations and instructions to the `table` on the server.
*
* @param {string} name
*/
open_table(name) {
return new proxy_table(this, name);
}

let _initialized = false;
open_view(name) {
return new proxy_view(this, name);
}

/**
* Handle a command from Perspective. If the Client is not initialized, initialize it and dispatch the `perspective-ready` event.
*
* Otherwise, reject or resolve the incoming command.
*/
Client.prototype._handle = function(e) {
if (!this._worker.initialized.value) {
if (!_initialized && typeof document !== "undefined") {
var event = document.createEvent("Event");
event.initEvent("perspective-ready", false, true);
window.dispatchEvent(event);
_initialized = true;
}
/**
* Handle a command from Perspective. If the Client is not initialized, initialize it and dispatch the `perspective-ready` event.
*
* Otherwise, reject or resolve the incoming command.
*/
_handle(e) {
if (!this._worker.initialized.value) {
if (!this._initialized && typeof document !== "undefined") {
var event = document.createEvent("Event");
event.initEvent("perspective-ready", false, true);
window.dispatchEvent(event);
this._initialized = true;
}

const msgs = this._worker.messages;
this._worker.initialized.value = true;
this._worker.messages = [];
const msgs = this._worker.messages;
this._worker.initialized.value = true;
this._worker.messages = [];

if (msgs) {
for (const m in msgs) {
if (msgs.hasOwnProperty(m)) {
msgs[m]();
if (msgs) {
for (const m in msgs) {
if (msgs.hasOwnProperty(m)) {
msgs[m]();
}
}
}
}
}
if (e.data.id) {
var handler = this._worker.handlers[e.data.id];
if (handler) {
if (e.data.error) {
handler.reject(e.data.error);
} else {
handler.resolve(e.data.data);
}
if (!handler.keep_alive) {
delete this._worker.handlers[e.data.id];
if (e.data.id) {
var handler = this._worker.handlers[e.data.id];
if (handler) {
if (e.data.error) {
handler.reject(e.data.error);
} else {
handler.resolve(e.data.data);
}
if (!handler.keep_alive) {
delete this._worker.handlers[e.data.id];
}
}
}
}
};

Client.prototype.table = function(data, options) {
return new table(this, data, options || {});
};
table(data, options) {
return new table(this, data, options || {});
}

Client.prototype.terminate = function() {
this._worker.terminate();
this._worker = undefined;
};
terminate() {
this._worker.terminate();
this._worker = undefined;
}
}