ENH: limit file checks in the abort function object to the master process

- do not recheck the abort after it has been triggered once.
  This reduces the output clutter and file checks.

src/functionObjects/utilities/abort/abort.C

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2017 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -61,17 +61,41 @@ Foam::functionObjects::abort::actionNames_
 };
 
 
-// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
+// * * * * * * * * * * * * * * * Local Functions * * * * * * * * * * * * * * //
 
-void Foam::functionObjects::abort::removeFile() const
+// file-scope
+// Long description for the action name
+namespace Foam
 {
-    bool hasAbort = isFile(abortFile_);
-    reduce(hasAbort, orOp<bool>());
+static std::string longDescription(const Time::stopAtControls ctrl)
+{
+    switch (ctrl)
+    {
+        case Foam::Time::saNoWriteNow :
+        {
+            return "stop without writing data";
+            break;
+        }
 
-    if (hasAbort && Pstream::master())
+        case Time::saWriteNow :
         {
-        // Cleanup ABORT file (on master only)
-        rm(abortFile_);
+            return "stop and write data";
+            break;
+        }
+
+        case Time::saNextWrite :
+        {
+            return "stop after next data write";
+            break;
+        }
+
+        default:
+        {
+            // Invalid choices already filtered out by Enum
+            return "abort";
+            break;
+        }
+    }
 }
 }
 
@@ -88,13 +112,17 @@ Foam::functionObjects::abort::abort
     functionObject(name),
     time_(runTime),
     abortFile_("$FOAM_CASE/" + name),
-    action_(Time::stopAtControls::saNextWrite)
+    action_(Time::stopAtControls::saNextWrite),
+    triggered_(false)
 {
     abortFile_.expand();
     read(dict);
 
-    // Remove any old files from previous runs
-    removeFile();
+    // Cleanup old files from previous runs
+    if (Pstream::master())
+    {
+        Foam::rm(abortFile_);
+    }
 }
 
 
@@ -110,6 +138,13 @@ bool Foam::functionObjects::abort::read(const dictionary& dict)
 {
     functionObject::read(dict);
 
+    if (dict.readIfPresent("file", abortFile_))
+    {
+        abortFile_.expand();
+    }
+
+    const auto oldAction = action_;
+
     action_ = actionNames_.lookupOrDefault
     (
         "action",
@@ -117,64 +152,42 @@ bool Foam::functionObjects::abort::read(const dictionary& dict)
         Time::stopAtControls::saNextWrite
     );
 
-    if (dict.readIfPresent("file", abortFile_))
+    // User can change action and re-trigger the abort.
+    // eg, they had nextWrite, but actually wanted writeNow.
+    if (oldAction != action_)
     {
-        abortFile_.expand();
+        triggered_ = false;
     }
 
+    Info<< type() << " activated ("
+        << longDescription(action_).c_str() <<")" << nl
+        << "    File: " << abortFile_ << endl;
+
     return true;
 }
 
 
 bool Foam::functionObjects::abort::execute()
 {
-    bool hasAbort = isFile(abortFile_);
-    reduce(hasAbort, orOp<bool>());
+    // If it has been triggered (eg, nextWrite) don't need to check it again
+    if (!triggered_)
+    {
+        bool hasAbort = (Pstream::master() && isFile(abortFile_));
+        Pstream::scatter(hasAbort);
 
         if (hasAbort)
         {
-        switch (action_)
-        {
-            case Time::saNoWriteNow :
-            {
-                if (time_.stopAt(action_))
+            triggered_ = time_.stopAt(action_);
+
+            if (triggered_)
             {
                 Info<< "USER REQUESTED ABORT (timeIndex="
                     << time_.timeIndex()
-                        << "): stop without writing data"
+                    << "): " << longDescription(action_).c_str()
                     << endl;
             }
-                break;
-            }
 
-            case Time::saWriteNow :
-            {
-                if (time_.stopAt(action_))
-                {
-                    Info<< "USER REQUESTED ABORT (timeIndex="
-                        << time_.timeIndex()
-                        << "): stop+write data"
-                        << endl;
-                }
-                break;
-            }
-
-            case Time::saNextWrite :
-            {
-                if (time_.stopAt(action_))
-                {
-                    Info<< "USER REQUESTED ABORT (timeIndex="
-                        << time_.timeIndex()
-                        << "): stop after next data write"
-                        << endl;
-                }
-                break;
-            }
-
-            default:
-            {
-                // Invalid choices already filtered out by Enum
-            }
+            Pstream::scatter(triggered_);
         }
     }
 
@@ -190,7 +203,12 @@ bool Foam::functionObjects::abort::write()
 
 bool Foam::functionObjects::abort::end()
 {
-    removeFile();
+    // Cleanup ABORT file
+    if (Pstream::master())
+    {
+        Foam::rm(abortFile_);
+    }
+
     return true;
 }
 

src/functionObjects/utilities/abort/abort.H

@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
-     \\/     M anipulation  |
+     \\/     M anipulation  | Copyright (C) 2017 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -30,12 +30,21 @@ Group
 Description
     Watches for presence of the named file in the $FOAM_CASE directory
     and aborts the calculation if it is present.
+    The presence of the abort file is only checked on the master process.
 
     Currently the following action types are supported:
     - noWriteNow
     - writeNow
     - nextWrite
 
+    \heading Function object usage
+    \table
+        Property  | Description         | Required  | Default value
+        type      | Type name: abort    | yes       |
+        file      | The abort filename  | no        | $FOAM_CASE/name
+        action    | Abort action        | no        | nextWrite
+    \endtable
+
 SourceFiles
     abort.C
 
@@ -76,12 +85,12 @@ class abort
         //- The type of action
         Time::stopAtControls action_;
 
+        //- Only trigger action once
+        bool triggered_;
+
 
     // Private Member Functions
 
-        //- Remove abort file.
-        void removeFile() const;
-
         //- Disallow default bitwise copy construct
         abort(const abort&) = delete;
 
@@ -102,7 +111,7 @@ public:
         (
             const word& name,
             const Time& runTime,
-            const dictionary&
+            const dictionary& dict
         );
 
 
@@ -115,13 +124,13 @@ public:
         //- Read the dictionary settings
         virtual bool read(const dictionary& dict);
 
-        //- Execute, check existence of abort file and take action
+        //- Check existence of abort file and take action
         virtual bool execute();
 
-        //- Execute, check existence of abort file and take action
+        //- No-op
         virtual bool write();
 
-        //- Execute at the final time-loop, used for cleanup
+        //- Remove abort file after the final time-loop.
         virtual bool end();
 };
 

tutorials/compressible/rhoSimpleFoam/gasMixing/injectorPipe/system/abort

@@ -0,0 +1,13 @@
+// OpenFOAM dictionary -*- C++ -*-
+
+ABORT
+{
+    type    abort;
+    libs    ("libutilityFunctionObjects.so");
+    //file    "$FOAM_CASE/ABORT";   // default name
+    // action  writeNow;
+    action  nextWrite;
+}
+
+
+// ************************************************************************* //

tutorials/compressible/rhoSimpleFoam/gasMixing/injectorPipe/system/controlDict

@@ -59,6 +59,7 @@ writeInterval   100;
 
 functions
 {
+    #include "abort"
     #include "scalarTransport"
     #include "sampling"
 }