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Issue 29329742: Issue 3251 - Simplify messaging from child scripts to parent (Closed)
Patch Set: Created Nov. 4, 2015, 2:58 p.m.
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1 /* 1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>, 2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-2015 Eyeo GmbH 3 * Copyright (C) 2006-2015 Eyeo GmbH
4 * 4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify 5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as 6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
8 * 8 *
9 * Adblock Plus is distributed in the hope that it will be useful, 9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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522 if (label != origLabel) 522 if (label != origLabel)
523 element.setAttribute(attr, label); 523 element.setAttribute(attr, label);
524 if (accesskey != "") 524 if (accesskey != "")
525 element.setAttribute("accesskey", accesskey); 525 element.setAttribute("accesskey", accesskey);
526 526
527 // Labels forward changes of the accessKey property to their control, only 527 // Labels forward changes of the accessKey property to their control, only
528 // set it for actual controls. 528 // set it for actual controls.
529 if (element.localName != "label") 529 if (element.localName != "label")
530 element.accessKey = accesskey; 530 element.accessKey = accesskey;
531 } 531 }
532 },
533
534 /**
535 * Adds a message handler that will respond to both synchronous and
536 * asynchonous messages.
537 * @param {string} messageName name of the message to listen to
538 * @param {Function} handler handler to be called with the message data. The
539 * return value will be sent back to the child.
540 */
541 addChildMessageListener: function(messageName, handler)
542 {
543 let messageManager = Cc["@mozilla.org/parentprocessmessagemanager;1"]
544 .getService(Ci.nsIMessageListenerManager);
545 let wrapper = (message) => {
546 let {callbackID, data} = message.data;
547 let response = undefined;
548 try
549 {
550 response = handler(data);
551 }
552 catch (e)
553 {
554 Cu.reportError(e);
555 }
556
557 if (callbackID)
558 {
559 let target = message.target.QueryInterface(Ci.nsIMessageSender);
560 target.sendAsyncMessage("AdblockPlus:Response", {
561 callbackID,
562 response
563 });
564 }
565 else
566 return JSON.stringify(response);
567 };
568 messageManager.addMessageListener(messageName, wrapper);
569 onShutdown.add(() => messageManager.removeMessageListener(messageName, wrapp er));
532 } 570 }
533 }; 571 };
534 572
535 /** 573 /**
536 * A cache with a fixed capacity, newer entries replace entries that have been 574 * A cache with a fixed capacity, newer entries replace entries that have been
537 * stored first. 575 * stored first.
538 * @constructor 576 * @constructor
539 */ 577 */
540 function Cache(/**Integer*/ size) 578 function Cache(/**Integer*/ size)
541 { 579 {
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782 Cu.reportError(e); 820 Cu.reportError(e);
783 // Expected, ctypes isn't supported in Gecko 1.9.2 821 // Expected, ctypes isn't supported in Gecko 1.9.2
784 return null; 822 return null;
785 } 823 }
786 }); 824 });
787 825
788 if ("@mozilla.org/messenger/headerparser;1" in Cc) 826 if ("@mozilla.org/messenger/headerparser;1" in Cc)
789 XPCOMUtils.defineLazyServiceGetter(Utils, "headerParser", "@mozilla.org/messen ger/headerparser;1", "nsIMsgHeaderParser"); 827 XPCOMUtils.defineLazyServiceGetter(Utils, "headerParser", "@mozilla.org/messen ger/headerparser;1", "nsIMsgHeaderParser");
790 else 828 else
791 Utils.headerParser = null; 829 Utils.headerParser = null;
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