ENH: refactor and combine externalFileCoupler (issue #529)

applications/test/externalCoupler/Make/files

-Test-externalCoupler.C
-
-EXE = $(FOAM_USER_APPBIN)/Test-externalCoupler

applications/test/externalCoupler/Make/options

-EXE_INC = \
-    -I$(LIB_SRC)/finiteVolume/lnInclude \
-    -I$(LIB_SRC)/lumpedPointMotion/lnInclude
-
-EXE_LIBS = \
-    -lfiniteVolume \
-    -llumpedPointMotion

applications/test/externalFileCoupler/Make/files

+Test-externalFileCoupler.C
+
+EXE = $(FOAM_USER_APPBIN)/Test-externalFileCoupler

applications/test/externalFileCoupler/Make/options

+EXE_INC = \
+    -I$(LIB_SRC)/finiteVolume/lnInclude
+
+EXE_LIBS = \
+    -lfiniteVolume

applications/test/externalCoupler/Test-externalCoupler.C → applications/test/externalFileCoupler/Test-externalFileCoupler.C

@@ -22,14 +22,14 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Application
-    Test-externalCoupler
+    Test-externalFileCoupler
 
 Description
     Test of master/slave communication etc.
 \*---------------------------------------------------------------------------*/
 
 #include "argList.H"
-#include "externalCoupler.H"
+#include "externalFileCoupler.H"
 
 using namespace Foam;
 
@@ -47,7 +47,7 @@ int main(int argc, char *argv[])
 
     const label maxCount = args.optionLookupOrDefault<label>("max", 1000);
 
-    externalCoupler coupler;
+    externalFileCoupler coupler;
 
     if (args.optionFound("slave"))
     {

applications/utilities/postProcessing/lumped/lumpedPointMovement/lumpedPointMovement.C

@@ -29,7 +29,7 @@ Description
     points/rotations and the corresponding movement of the building surfaces.
     Uses the tabulated responses from the specified file.
     Optionally, it can also be used to a dummy responder for the
-    externalCoupler logic, which makes it useful as a debugging facility
+    externalFileCoupler logic, which makes it useful as a debugging facility
     as well demonstrating how an external application could communicate
     with the lumpedPointMovement point-patch boundary condition.
 
@@ -131,7 +131,7 @@ int main(int argc, char *argv[])
     {
         Info<< "Running as slave responder" << endl;
 
-        externalCoupler& coupler = movement().coupler();
+        externalFileCoupler& coupler = movement().coupler();
 
         label count = 0;
         for (label index = 0; index < responseTable.size(); index += span)

src/finiteVolume/Make/files

@@ -411,6 +411,9 @@ $(general)/bound/bound.C
 $(general)/CorrectPhi/correctUphiBCs.C
 $(general)/pressureControl/pressureControl.C
 
+coupling = $(general)/coupling
+$(coupling)/externalFileCoupler.C
+
 solutionControl = $(general)/solutionControl
 $(solutionControl)/solutionControl/solutionControl.C
 $(solutionControl)/simpleControl/simpleControl.C

src/lumpedPointMotion/externalCoupler.C → src/finiteVolume/cfdTools/general/coupling/externalFileCoupler.C

@@ -23,22 +23,21 @@ License
 
 \*---------------------------------------------------------------------------*/
 
-#include "externalCoupler.H"
+#include "externalFileCoupler.H"
 #include "Pstream.H"
 #include "PstreamReduceOps.H"
 #include "OSspecific.H"
-#include "IFstream.H"
-#include "OFstream.H"
 #include "Switch.H"
+#include <fstream>
 
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
 namespace Foam
 {
-    defineTypeNameAndDebug(externalCoupler, 0);
+    defineTypeNameAndDebug(externalFileCoupler, 0);
 }
 
-Foam::word Foam::externalCoupler::lockName = "OpenFOAM";
+Foam::word Foam::externalFileCoupler::lockName = "OpenFOAM";
 
 
 // file-scope
@@ -46,33 +45,33 @@ Foam::word Foam::externalCoupler::lockName = "OpenFOAM";
 static bool checkIsDone(const std::string& lck)
 {
     std::string content;
-    std::ifstream is(lck.c_str());
+    std::ifstream is(lck);
     is >> content;
 
     return (content.find("done") != std::string::npos);
 }
 
 
-// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
-
-const Foam::fileName& Foam::externalCoupler::baseDir() const
-{
-    return commsDir_;
-}
-
+// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::fileName Foam::externalCoupler::lockFile() const
+Foam::externalFileCoupler::externalFileCoupler()
+:
+    runState_(NONE),
+    commsDir_("$FOAM_CASE/comms"),
+    waitInterval_(1u),
+    timeOut_(100u),
+    slaveFirst_(false),
+    log(false)
 {
-    return resolveFile(lockName + ".lock");
+    commsDir_.expand();
+    commsDir_.clean();
 }
 
 
-// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
-
-Foam::externalCoupler::externalCoupler()
+Foam::externalFileCoupler::externalFileCoupler(const fileName& commsDir)
 :
     runState_(NONE),
-    commsDir_("$FOAM_CASE/comms"),
+    commsDir_(commsDir),
     waitInterval_(1u),
     timeOut_(100u),
     slaveFirst_(false),
@@ -80,25 +79,30 @@ Foam::externalCoupler::externalCoupler()
 {
     commsDir_.expand();
     commsDir_.clean();
+
+    if (Pstream::master())
+    {
+        mkDir(commsDir_);
+    }
 }
 
 
-Foam::externalCoupler::externalCoupler(const dictionary& dict)
+Foam::externalFileCoupler::externalFileCoupler(const dictionary& dict)
 :
-    externalCoupler()
+    externalFileCoupler()
 {
     readDict(dict);
 
     if (Pstream::master())
     {
-        mkDir(baseDir());
+        mkDir(commsDir_);
     }
 }
 
 
 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
-Foam::externalCoupler::~externalCoupler()
+Foam::externalFileCoupler::~externalFileCoupler()
 {
     shutdown();
 }
@@ -106,14 +110,21 @@ Foam::externalCoupler::~externalCoupler()
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
-bool Foam::externalCoupler::readDict(const dictionary& dict)
+bool Foam::externalFileCoupler::readDict(const dictionary& dict)
 {
     // Normally cannot change directory or initialization
     // if things have already been initialized
-    dict.lookup("commsDir") >> commsDir_;
-    commsDir_.expand();
-    commsDir_.clean();
-    slaveFirst_ = dict.lookupOrDefault<bool>("initByExternal", false);
+    if (!initialized())
+    {
+        dict.lookup("commsDir") >> commsDir_;
+        commsDir_.expand();
+        commsDir_.clean();
+        slaveFirst_ = dict.lookupOrDefault<bool>("initByExternal", false);
+
+        Info<< type() << ": initialize" << nl
+            << "    directory: " << commsDir_ << nl
+            << "    slave-first: " << Switch(slaveFirst_) << endl;
+    }
 
     waitInterval_ = dict.lookupOrDefault("waitInterval", 1u);
     if (!waitInterval_)
@@ -130,19 +141,7 @@ bool Foam::externalCoupler::readDict(const dictionary& dict)
 }
 
 
-bool Foam::externalCoupler::initialized() const
-{
-    return runState_ != NONE;
-}
-
-
-bool Foam::externalCoupler::slaveFirst() const
-{
-    return slaveFirst_;
-}
-
-
-void Foam::externalCoupler::useMaster(const bool wait) const
+void Foam::externalFileCoupler::useMaster(const bool wait) const
 {
     const bool wasInit = initialized();
     runState_ = MASTER;
@@ -162,7 +161,7 @@ void Foam::externalCoupler::useMaster(const bool wait) const
         {
             Log << type() << ": creating lock file" << endl;
 
-            OFstream os(lck);
+            std::ofstream os(lck);
             os << "status=openfoam\n";
             os.flush();
         }
@@ -175,7 +174,7 @@ void Foam::externalCoupler::useMaster(const bool wait) const
 }
 
 
-void Foam::externalCoupler::useSlave(const bool wait) const
+void Foam::externalFileCoupler::useSlave(const bool wait) const
 {
     const bool wasInit = initialized();
     runState_ = SLAVE;
@@ -200,7 +199,7 @@ void Foam::externalCoupler::useSlave(const bool wait) const
 }
 
 
-bool Foam::externalCoupler::waitForMaster() const
+bool Foam::externalFileCoupler::waitForMaster() const
 {
     if (!initialized())
     {
@@ -212,7 +211,7 @@ bool Foam::externalCoupler::waitForMaster() const
     {
         const fileName lck(lockFile());
 
-        double prevTime = -1;
+        double prevTime = 0;
         double modTime = 0;
 
         // Wait until file disappears (modTime == 0)
@@ -239,7 +238,7 @@ bool Foam::externalCoupler::waitForMaster() const
 }
 
 
-bool Foam::externalCoupler::waitForSlave() const
+bool Foam::externalFileCoupler::waitForSlave() const
 {
     if (!initialized())
     {
@@ -281,23 +280,38 @@ bool Foam::externalCoupler::waitForSlave() const
 }
 
 
-Foam::fileName Foam::externalCoupler::resolveFile
-(
-    const word& file
-) const
-{
-    return fileName(baseDir()/file);
-}
+void Foam::externalFileCoupler::readDataMaster()
+{}
+
+
+void Foam::externalFileCoupler::readDataSlave()
+{}
+
+
+void Foam::externalFileCoupler::writeDataMaster() const
+{}
+
+
+void Foam::externalFileCoupler::writeDataSlave() const
+{}
+
+
+void Foam::externalFileCoupler::removeDataMaster() const
+{}
+
+
+void Foam::externalFileCoupler::removeDataSlave() const
+{}
 
 
-void Foam::externalCoupler::shutdown() const
+void Foam::externalFileCoupler::shutdown() const
 {
     if (Pstream::master() && runState_ == MASTER && Foam::isDir(commsDir_))
     {
         const fileName lck(lockFile());
 
         Log << type() << ": lock file status=done" << endl;
-        OFstream os(lck);
+        std::ofstream os(lck);
         os  << "status=done\n";
         os.flush();
     }

src/lumpedPointMotion/externalCoupler.H → src/finiteVolume/cfdTools/general/coupling/externalFileCoupler.H

@@ -22,7 +22,7 @@ License
     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
 Class
-    Foam::externalCoupler
+    Foam::externalFileCoupler
 
 Description
     Encapsulates the logic for coordinating between OpenFOAM and an
@@ -57,13 +57,32 @@ Description
     }
     \endverbatim
 
+    A typical coupling loop would look like this (on the master-side):
+    \verbatim
+        initialize - master takes control
+        write data for slave
+        use slave, wait for slave
+        cleanup old data from master
+        read data from slave
+        use master
+    \endverbatim
+
+    On the slave-side:
+    \verbatim
+        wait for master
+        read data from master
+        write data for master
+        use master
+    \endverbatim
+
 SourceFiles
-    externalCoupler.C
+    externalFileCoupler.C
+    externalFileCouplerI.H
 
 \*---------------------------------------------------------------------------*/
 
-#ifndef externalCoupler_H
-#define externalCoupler_H
+#ifndef externalFileCoupler_H
+#define externalFileCoupler_H
 
 #include "fileName.H"
 #include "dictionary.H"
@@ -74,20 +93,26 @@ namespace Foam
 {
 
 /*---------------------------------------------------------------------------*\
-                       Class externalCoupler Declaration
+                     Class externalFileCoupler Declaration
 \*---------------------------------------------------------------------------*/
 
-class externalCoupler
+class externalFileCoupler
 {
-    //- The run state (ie, who is currently in charge)
-    enum runState
-    {
-        NONE,       //!< Not initialized
-        MASTER,     //!< The master (OpenFOAM) is in charge
-        SLAVE,      //!< The slave (external program) is in charge
-        DONE        //!< Finished
-    };
+public:
+
+    // Public data types
+
+        //- The run state (ie, who is currently in charge)
+        enum runState
+        {
+            NONE,       //!< Not initialized
+            MASTER,     //!< The master (OpenFOAM) is in charge
+            SLAVE,      //!< The slave (external program) is in charge
+            DONE        //!< Finished
+        };
+
 
+private:
 
     // Private data
 
@@ -103,7 +128,7 @@ class externalCoupler
         //- Timeout [s] while waiting for the external application
         unsigned timeOut_;
 
-        //- Flag to indicate values are initialized by external application
+        //- Flag to indicate values are initialized by external program
         bool slaveFirst_;
 
         //- Local logging/verbosity flag
@@ -112,22 +137,17 @@ class externalCoupler
 
     // Private Member Functions
 
-        //- Return the file path to the base communications directory
-        const fileName& baseDir() const;
-
-        //- Return the file path to the lock file
-        fileName lockFile() const;
-
-        //- Disallow default bitwise copy construc
-        externalCoupler(const externalCoupler&) = delete;
+        //- Disallow default bitwise copy construct
+        externalFileCoupler(const externalFileCoupler&) = delete;
 
         //- Disallow default bitwise assignmen
-        void operator=(const externalCoupler&) = delete;
+        void operator=(const externalFileCoupler&) = delete;
+
 
 public:
 
     //- Runtime type information
-    TypeName("externalCoupler");
+    TypeName("externalFileCoupler");
 
 
     // Static data members
@@ -138,48 +158,98 @@ public:
 
     // Constructors
 
-        //- Construct null using standard defaults
-        externalCoupler();
+        //- Construct using standard defaults.
+        //  Does not create communications directory.
+        externalFileCoupler();
+
+        //- Construct with specified communications directory.
+        //  Creates the communications directory upon construction.
+        externalFileCoupler(const fileName& commsDir);
 
         //- Construct from dictionary
-        externalCoupler(const dictionary& dict);
+        //  Creates the communications directory upon construction.
+        externalFileCoupler(const dictionary& dict);
 
 
     //- Destructor
-    virtual ~externalCoupler();
+    virtual ~externalFileCoupler();
 
 
     // Member Functions
 
-      // Access
+      // Initialization
 
         //- True if state has been initialized
-        bool initialized() const;
+        inline bool initialized() const;
 
         //- External application provides initial values
-        bool slaveFirst() const;
+        inline bool slaveFirst() const;
+
+
+      // File locations
+
+        //- Return the file path to the base communications directory
+        inline const fileName& commDirectory() const;
+
+        //- Return the file path in the communications directory
+        inline fileName resolveFile(const word& file) const;
+
+        //- Return the file path to the lock file
+        inline fileName lockFile() const;
+
+
+      // Settings
+
+        //- Read communication settings from dictionary
+        bool readDict(const dictionary& dict);
+
+
+      // Handshaking
 
         //- Create lock file to indicate that OpenFOAM is in charge
-        //  Optionally wait for master as well.
+        //  Optionally wait for master to complete as well.
         void useMaster(const bool wait=false) const;
 
-        //- Wait for indication that OpenFOAM has supplied output.
-        //  This is when the lock file disappears, or it exists but with
+        //- Remove lock file to indicate that the external program is in charge
+        //  Optionally wait for slave to complete as well.
+        void useSlave(const bool wait=false) const;
+
+
+        //- Wait for master to complete.
+        //  This is when the lock file disappears, or exists but has
         //  "status=done" content.
         //  \return False if lock file contains "status=done"
         bool waitForMaster() const;
 
-        //- Remove lock file to indicate that the external program is in charge
-        //  Optionally wait for slave as well.
-        void useSlave(const bool wait=false) const;
-
-        //- Wait for indication that the external program has supplied input.
+        //- Wait for slave to complete.
         //  This is when the lock file appears.
         //  \return False if lock file contains "status=done"
         bool waitForSlave() const;
 
-        //- Return the file path in the communications directory
-        fileName resolveFile(const word& file) const;
+
+      // File creation, removal
+
+        //- Read data files on master (OpenFOAM).
+        //  These data files are normally created by the slave.
+        virtual void readDataMaster();
+
+        //- Read data files on slave (external program).
+        //  These data files are normally created by the master.
+        virtual void readDataSlave();
+
+
+        //- Write data files from master (OpenFOAM)
+        virtual void writeDataMaster() const;
+
+        //- Write data files from slave (external program)
+        virtual void writeDataSlave() const;
+
+
+        //- Remove data files written by master (OpenFOAM)
+        virtual void removeDataMaster() const;
+
+        //- Remove data files written by slave (external program)
+        virtual void removeDataSlave() const;
 
         //- Generate status=done in lock (only when run-state = master)
         void shutdown() const;
@@ -188,11 +258,6 @@ public:
         void removeDirectory() const;
 
 
-      // Edit
-
-        //- Read communication settings from dictionary
-        bool readDict(const dictionary& dict);
-
 };
 
 
@@ -202,6 +267,10 @@ public:
 
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
+#include "externalFileCouplerI.H"
+
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
 #endif
 
 // ************************************************************************* //

src/finiteVolume/cfdTools/general/coupling/externalFileCouplerI.H

+/*---------------------------------------------------------------------------*\
+  =========                 |
+  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
+   \\    /   O peration     |
+    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
+     \\/     M anipulation  |
+-------------------------------------------------------------------------------
+License
+    This file is part of OpenFOAM.
+
+    OpenFOAM is free software: you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
+
+\*---------------------------------------------------------------------------*/
+
+// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
+
+inline bool Foam::externalFileCoupler::initialized() const
+{
+    return runState_ != NONE;
+}
+
+
+inline bool Foam::externalFileCoupler::slaveFirst() const
+{