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229 lines
9.3 KiB
Plaintext
229 lines
9.3 KiB
Plaintext
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla IPC.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Darin Fisher <darin@netscape.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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interface ipcIMessageObserver;
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interface ipcIClientObserver;
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/**
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* ipcIService
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*
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* the IPC service provides the means to communicate with an external IPC
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* daemon and/or other mozilla-based applications on the same physical system.
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* the IPC daemon hosts modules (some builtin and others dynamically loaded)
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* with which applications may interact.
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*
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* at application startup, the IPC service will attempt to establish a
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* connection with the IPC daemon. the IPC daemon will be automatically
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* started if necessary. when a connection has been established, the IPC
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* service will enumerate the "ipc-startup-category" and broadcast an
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* "ipc-startup" notification using the observer service.
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*
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* when the connection to the IPC daemon is closed, an "ipc-shutdown"
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* notification will be broadcast.
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*
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* each client has a name. the client name need not be unique across all
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* clients, but it is usually good if it is. the IPC service does not require
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* unique names. instead, the IPC daemon assigns each client a unique ID that
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* is good for the current "session." clients can query other clients by name
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* or by ID. the IPC service supports forwarding messages from one client to
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* another via the IPC daemon.
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*
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* for performance reasons, this system should not be used to transfer large
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* amounts of data. instead, applications may choose to utilize shared memory,
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* and rely on the IPC service for synchronization and small message transfer
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* only.
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*/
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[scriptable, uuid(53d3e3a7-528f-4b09-9eab-9416272568c0)]
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interface ipcIService : nsISupports
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{
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/**************************************************************************
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* properties of this process
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*/
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/**
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* returns the "client ID" assigned to this process by the IPC daemon.
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*
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* @throws NS_ERROR_NOT_AVAILABLE if no connection to the IPC daemon.
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*/
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readonly attribute unsigned long ID;
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/**
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* this process can appear under several client names. use the following
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* methods to add or remove names for this process.
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*
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* for example, the mozilla browser might have the primary name "mozilla",
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* but it could also register itself under the names "browser", "mail",
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* "news", "addrbook", etc. other IPC clients can then query the IPC
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* daemon for the client named "mail" in order to talk with a mail program.
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*
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* XXX An IPC client name resembles a XPCOM contract ID.
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*/
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void addName(in string aName);
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void removeName(in string aName);
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/**
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* add a new observer of client status change notifications.
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*/
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void addClientObserver(in ipcIClientObserver aObserver);
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/**
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* remove an observer of client status change notifications.
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*/
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void removeClientObserver(in ipcIClientObserver aObserver);
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/**************************************************************************
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* client query methods
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*/
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/**
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* resolve the given client name to the id of a connected client. this
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* involves a round trip to the daemon, and as a result the calling thread
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* may block on this function call while waiting for the daemon to respond.
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*/
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unsigned long resolveClientName(in string aName);
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/**
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* tests whether a particular client is connected to the IPC daemon.
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*/
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boolean clientExists(in unsigned long aClientID);
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// XXX need other functions to enumerate clients, clients implementing targets, etc.
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// enumerator getClients();
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// enumerator getClientsSupportingTarget(in nsIDRef aTarget);
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// enumerator getClientNames(in unsigned long aClientID);
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// enumerator getClientTargets(in unsigned long aClientID);
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/**************************************************************************
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* message methods
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*/
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/**
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* set a message observer for a particular message target.
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*
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* @param aTarget
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* the message target being observed. any existing observer will
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* be replaced.
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* @param aObserver
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* the message observer to receive incoming messages for the
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* specified target. pass null to remove the existing observer.
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* @param aOnCurrentThread
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* if true, then the message observer will be called on the same
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* thread that calls defineTarget. otherwise, aObserver will be
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* called on a background thread.
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*/
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void defineTarget(in nsIDRef aTarget,
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in ipcIMessageObserver aObserver,
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in boolean aOnCurrentThread);
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/**
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* send message asynchronously to a client or a module in the IPC daemon.
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* there is no guarantee that the message will be delivered.
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*
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* @param aClientID
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* the client ID of the foreign application that should receive this
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* message. pass 0 to send a message to a module in the IPC daemon.
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* @param aTarget
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* the target of the message. if aClientID is 0, then this is the
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* ID of the daemon module that should receive this message.
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* @param aData
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* the message data.
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* @param aDataLen
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* the message length.
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*/
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void sendMessage(in unsigned long aReceiverID,
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in nsIDRef aTarget,
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[array, const, size_is(aDataLen)]
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in octet aData,
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in unsigned long aDataLen);
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/**
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* block the calling thread until a matching message is received.
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*
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* @param aSenderID
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* pass 0 to wait for a message from the daemon. pass PR_UINT32_MAX
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* to wait for a message from any source. otherwise, pass a client
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* id to wait for a message from that particular client.
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* @param aTarget
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* wait for a message to be delivered to this target.
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* @param aObserver
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* this observer's OnMessageAvailable method is called when a
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* matching message is available. pass null to use the default
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* observer associated with aTarget.
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* @param aTimeout
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* indicates maximum length of time in milliseconds that this
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* function may block the calling thread.
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*
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* @throws IPC_ERROR_WOULD_BLOCK if the timeout expires.
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*
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* the observer's OnMessageAvailable method may throw IPC_WAIT_NEXT_MESSAGE
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* to indicate that it does not wish to handle the message that it was
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* given, and that it will wait to be called with the next message. this
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* enables the observer to keep messages in the queue that do not match the
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* desired message. messages that remain in the queue will be dispatched
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* asynchronously to the default message handler after waitMessage finishes.
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*
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* NOTE: this function may hang the calling thread until a matching message
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* is received, so use it with caution.
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*/
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void waitMessage(in unsigned long aSenderID,
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in nsIDRef aTarget,
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in ipcIMessageObserver aObserver,
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in unsigned long aTimeout);
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/**
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* Call this method to disable the default message observer for a target.
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*/
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void disableMessageObserver(in nsIDRef aTarget);
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/**
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* Call this method to re-enable the default message observer for a target.
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*/
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void enableMessageObserver(in nsIDRef aTarget);
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};
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%{C++
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// category and observer event defines (XXX not yet implemented)
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#define IPC_SERVICE_STARTUP_CATEGORY "ipc-startup-category"
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#define IPC_SERVICE_STARTUP_TOPIC "ipc-startup"
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#define IPC_SERVICE_SHUTDOWN_TOPIC "ipc-shutdown"
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%}
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