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191 lines
8.4 KiB
191 lines
8.4 KiB
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2013 - Raw Material Software Ltd.
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Permission is granted to use this software under the terms of either:
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a) the GPL v2 (or any later version)
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b) the Affero GPL v3
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Details of these licenses can be found at: www.gnu.org/licenses
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.juce.com for more information.
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==============================================================================
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*/
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#ifndef JUCE_CONNECTEDCHILDPROCESS_H_INCLUDED
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#define JUCE_CONNECTEDCHILDPROCESS_H_INCLUDED
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//==============================================================================
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/**
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Acts as the slave end of a master/slave pair of connected processes.
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The ChildProcessSlave and ChildProcessMaster classes make it easy for an app
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to spawn a child process, and to manage a 2-way messaging connection to control it.
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To use the system, you need to create subclasses of both ChildProcessSlave and
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ChildProcessMaster. To instantiate the ChildProcessSlave object, you must
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add some code to your main() or JUCEApplication::initialise() function that
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calls the initialiseFromCommandLine() method to check the app's command-line
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parameters to see whether it's being launched as a child process. If this returns
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true then the slave process can be allowed to run, and its handleMessageFromMaster()
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method will be called whenever a message arrives.
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The juce demo app has a good example of this class in action.
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@see ChildProcessMaster, InterprocessConnection, ChildProcess
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*/
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class JUCE_API ChildProcessSlave
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{
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public:
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/** Creates a non-connected slave process.
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Use initialiseFromCommandLine to connect to a master process.
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*/
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ChildProcessSlave();
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/** Destructor. */
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virtual ~ChildProcessSlave();
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/** This checks some command-line parameters to see whether they were generated by
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ChildProcessMaster::launchSlaveProcess(), and if so, connects to that master process.
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In an exe that can be used as a child process, you should add some code to your
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main() or JUCEApplication::initialise() that calls this method.
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The commandLineUniqueID should be a short alphanumeric identifier (no spaces!)
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that matches the string passed to ChildProcessMaster::launchSlaveProcess().
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The timeoutMs parameter lets you specify how long the child process is allowed
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to run without receiving a ping from the master before the master is considered to
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have died, and handleConnectionLost() will be called. Passing <= 0 for this timeout
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makes it use a default value.
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Returns true if the command-line matches and the connection is made successfully.
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*/
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bool initialiseFromCommandLine (const String& commandLine,
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const String& commandLineUniqueID,
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int timeoutMs = 0);
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//==============================================================================
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/** This will be called to deliver messages from the master process.
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The call will probably be made on a background thread, so be careful with your
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thread-safety! You may want to respond by sending back a message with
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sendMessageToMaster()
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*/
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virtual void handleMessageFromMaster (const MemoryBlock&) = 0;
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/** This will be called when the master process finishes connecting to this slave.
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The call will probably be made on a background thread, so be careful with your thread-safety!
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*/
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virtual void handleConnectionMade();
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/** This will be called when the connection to the master process is lost.
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The call may be made from any thread (including the message thread).
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Typically, if your process only exists to act as a slave, you should probably exit
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when this happens.
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*/
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virtual void handleConnectionLost();
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/** Tries to send a message to the master process.
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This returns true if the message was sent, but doesn't check that it actually gets
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delivered at the other end. If successful, the data will emerge in a call to your
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ChildProcessMaster::handleMessageFromSlave().
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*/
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bool sendMessageToMaster (const MemoryBlock&);
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private:
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struct Connection;
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friend struct Connection;
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friend struct ContainerDeletePolicy<Connection>;
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ScopedPointer<Connection> connection;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ChildProcessSlave)
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};
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//==============================================================================
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/**
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Acts as the master in a master/slave pair of connected processes.
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The ChildProcessSlave and ChildProcessMaster classes make it easy for an app
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to spawn a child process, and to manage a 2-way messaging connection to control it.
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To use the system, you need to create subclasses of both ChildProcessSlave and
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ChildProcessMaster. When you want your master process to launch the slave, you
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just call launchSlaveProcess(), and it'll attempt to launch the executable that
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you specify (which may be the same exe), and assuming it has been set-up to
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correctly parse the command-line parameters (see ChildProcessSlave) then a
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two-way connection will be created.
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The juce demo app has a good example of this class in action.
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@see ChildProcessSlave, InterprocessConnection, ChildProcess
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*/
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class JUCE_API ChildProcessMaster
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{
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public:
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/** Creates an uninitialised master process object.
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Use launchSlaveProcess to launch and connect to a child process.
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*/
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ChildProcessMaster();
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/** Destructor. */
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virtual ~ChildProcessMaster();
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/** Attempts to launch and connect to a slave process.
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This will start the given executable, passing it a special command-line
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parameter based around the commandLineUniqueID string, which must be a
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short alphanumeric string (no spaces!) that identifies your app. The exe
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that gets launched must respond by calling ChildProcessSlave::initialiseFromCommandLine()
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in its startup code, and must use a matching ID to commandLineUniqueID.
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The timeoutMs parameter lets you specify how long the child process is allowed
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to go without sending a ping before it is considered to have died and
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handleConnectionLost() will be called. Passing <= 0 for this timeout makes
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it use a default value.
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If this all works, the method returns true, and you can begin sending and
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receiving messages with the slave process.
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*/
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bool launchSlaveProcess (const File& executableToLaunch,
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const String& commandLineUniqueID,
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int timeoutMs = 0);
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/** This will be called to deliver a message from the slave process.
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The call will probably be made on a background thread, so be careful with your thread-safety!
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*/
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virtual void handleMessageFromSlave (const MemoryBlock&) = 0;
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/** This will be called when the slave process dies or is somehow disconnected.
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The call will probably be made on a background thread, so be careful with your thread-safety!
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*/
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virtual void handleConnectionLost();
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/** Attempts to send a message to the slave process.
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This returns true if the message was dispatched, but doesn't check that it actually
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gets delivered at the other end. If successful, the data will emerge in a call to
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your ChildProcessSlave::handleMessageFromMaster().
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*/
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bool sendMessageToSlave (const MemoryBlock&);
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private:
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ChildProcess childProcess;
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struct Connection;
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friend struct Connection;
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friend struct ContainerDeletePolicy<Connection>;
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ScopedPointer<Connection> connection;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ChildProcessMaster)
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};
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#endif // JUCE_CONNECTEDCHILDPROCESS_H_INCLUDED
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