nsIJetpack

Method overview

Methods

sendMessage()

This method asynchronously sends a message to the Jetpack process.

void sendMessage(
  in AString aMessageName,
  [optional] in jsval v1, Optional
  [optional] in jsval v2, Optional
  ...
);

Parameters

aMessageName

The name of the message to send.

v1, v2, ... Optional

JavaScript values to send with the message; they must be either JSON-serializable types or handles.

registerReceiver()

This registers a callback to be triggered whenever the Jetpack process sends a particular message.

void registerReceiver(
  in AString aMessageName,
  in jsval aReceiver
);

Parameters

aMessageName

The name of the message from the Jetpack process on which the callback is triggered.

aReceiver

A JavaScript function. The first argument passed to it is the name of the message, and all arguments following it are either JSON-serializable types or handles. If the message was sent synchronously from the Jetpack process via callMessage(), then the return value of this function is passed back to the Jetpack process.

unregisterReceiver()

This unregisters a callback previously registered with registerReceiver()

void unregisterReceiver(
  in AString aMessageName,
  in jsval aReceiver
);

Parameters

aMessageName

The name of the message on which the callback should no longer be triggered.

aReceiver

The JavaScript function that should no longer be triggered.

unregisterReceivers()

This unregisters all callbacks previously registered with registerReceiver() for a particular message.

void unregisterReceivers(
  in AString aMessageName
);

Parameters

aMessageName

The name of the message to unregister all callbacks from.

evalScript()

This asynchronously sends code to the Jetpack process for evaluation. The code will be evaluated using at least JavaScript 1.8.1.

When evaluated, the script's global scope will include all privileged APIs.

Individual lines of the form //@line 1 "foo.js" can be used to specify filename and line number information for debugging purposes.

void evalScript(
  in AString aScript
);

Parameters

aScript

The full contents of the script to evaluate in the Jetpack process.

createHandle()

This creates an opaque handle that can transparently be exchanged between processes.

nsIVariant createHandle();

Parameters

None.

Return value

The new handle.

destroy()

This terminates the Jetpack process.

void destroy();

Parameters

None.

Special Messages

If an exception goes uncaught in the Jetpack process, it will be reported to the chrome process via a message with the name core:exception. The message comes with one argument, which represents the exception object that was thrown.

Warning: bug 589308 prevents this message from being sent in some situations.

History

See bug 556846 for details.

See also

• nsIJetpackService
• Jetpack Processes