Add isEnabled method to meta-data producers; Put interface on top of MetaDataProducer, for times when someone wants that; update MetaDataProducerHelper to work w/ the interface.

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/MetaDataProducerInterface.java

@@ -0,0 +1,78 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model;
+
+
+import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.TopLevelMetaDataInterface;
+
+
+/*******************************************************************************
+ ** Interface for classes that know how to produce meta data objects.  Useful with
+ ** MetaDataProducerHelper, to put point at a package full of these, and populate
+ ** your whole QInstance.
+ **
+ ** See also MetaDataProducer - an implementer of this interface, which actually
+ ** came first, and is fine to extend if producing a meta-data class is all your
+ ** clas means to do (nice and "Single-responsibility principle").
+ **
+ ** But, in some applications you may want to, for example, have one class that
+ ** defines a process step, and also produces the meta-data for that process, so
+ ** your whole process can just be one class - so then just have your step class
+ ** implement this interface.  or, same idea for a QRecordEntity that provides
+ ** its own TableMetaData.
+ *******************************************************************************/
+public interface MetaDataProducerInterface<T extends TopLevelMetaDataInterface>
+{
+   int DEFAULT_SORT_ORDER = 500;
+
+
+   /*******************************************************************************
+    ** Produce the metaData object.  Generally, you don't want to add it to the instance
+    ** yourself - but the instance is there in case you need it to get other metaData.
+    *******************************************************************************/
+   T produce(QInstance qInstance) throws QException;
+
+
+   /*******************************************************************************
+    ** In case this producer needs to run before (or after) others, this method
+    ** can control influence that (e.g., if used by MetaDataProducerHelper).
+    **
+    ** Smaller values run first.
+    *******************************************************************************/
+   default int getSortOrder()
+   {
+      return (DEFAULT_SORT_ORDER);
+   }
+
+
+   /*******************************************************************************
+    ** turn this producer on or off - e.g., maybe based on an env value.
+    **
+    *******************************************************************************/
+   default boolean isEnabled()
+   {
+      return (true);
+   }
+
+}

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/MetaDataProducer.java

@@ -22,7 +22,7 @@
 package com.kingsrook.qqq.backend.core.model.metadata;
 
 
-import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.model.MetaDataProducerInterface;
 
 
 /*******************************************************************************
@@ -30,29 +30,7 @@ import com.kingsrook.qqq.backend.core.exceptions.QException;
  ** MetaDataProducerHelper, to put point at a package full of these, and populate
  ** your whole QInstance.
  *******************************************************************************/
-public abstract class MetaDataProducer<T extends TopLevelMetaDataInterface>
+public abstract class MetaDataProducer<T extends TopLevelMetaDataInterface> implements MetaDataProducerInterface<T>
 {
-   public static final int DEFAULT_SORT_ORDER = 500;
-
-
-
-   /*******************************************************************************
-    ** Produce the metaData object.  Generally, you don't want to add it to the instance
-    ** yourself - but the instance is there in case you need it to get other metaData.
-    *******************************************************************************/
-   public abstract T produce(QInstance qInstance) throws QException;
-
-
-
-   /*******************************************************************************
-    ** In case this producer needs to run before (or after) others, this method
-    ** can control influence that (e.g., if used by MetaDataProducerHelper).
-    **
-    ** Smaller values run first.
-    *******************************************************************************/
-   public int getSortOrder()
-   {
-      return (DEFAULT_SORT_ORDER);
-   }
 
 }

qqq-backend-core/src/main/java/com/kingsrook/qqq/backend/core/model/metadata/MetaDataProducerHelper.java

@@ -30,6 +30,7 @@ import java.util.Comparator;
 import java.util.List;
 import com.google.common.reflect.ClassPath;
 import com.kingsrook.qqq.backend.core.logging.QLogger;
+import com.kingsrook.qqq.backend.core.model.MetaDataProducerInterface;
 import com.kingsrook.qqq.backend.core.model.metadata.layout.QAppMetaData;
 import static com.kingsrook.qqq.backend.core.logging.LogUtils.logPair;
 
@@ -44,7 +45,7 @@ public class MetaDataProducerHelper
 
 
    /*******************************************************************************
-    ** Recursively find all classes in the given package, that extend MetaDataProducer,
+    ** Recursively find all classes in the given package, that implement MetaDataProducerInterface
     ** run them, and add their output to the given qInstance.
     **
     ** Note - they'll be sorted by the sortOrder they provide.
@@ -55,7 +56,7 @@ public class MetaDataProducerHelper
       // find all the meta data producer classes in (and under) the package //
       ////////////////////////////////////////////////////////////////////////
       List<Class<?>>                     classesInPackage = getClassesInPackage(packageName);
-      List<MetaDataProducer<?>> producers        = new ArrayList<>();
+      List<MetaDataProducerInterface<?>> producers        = new ArrayList<>();
       for(Class<?> aClass : classesInPackage)
       {
          try
@@ -65,22 +66,29 @@ public class MetaDataProducerHelper
                continue;
             }
 
+            if(MetaDataProducerInterface.class.isAssignableFrom(aClass))
+            {
+               boolean foundValidConstructor = false;
                for(Constructor<?> constructor : aClass.getConstructors())
                {
                   if(constructor.getParameterCount() == 0)
                   {
                      Object o = constructor.newInstance();
-                  if(o instanceof MetaDataProducer<?> metaDataProducer)
-                  {
-                     producers.add(metaDataProducer);
-                  }
+                     producers.add((MetaDataProducerInterface<?>) o);
+                     foundValidConstructor = true;
                      break;
                   }
                }
+
+               if(!foundValidConstructor)
+               {
+                  LOG.warn("Found a class which implements MetaDataProducerInterface, but it does not have a no-arg constructor, so it cannot be used.", logPair("class", aClass.getSimpleName()));
+               }
+            }
          }
          catch(Exception e)
          {
-            LOG.info("Error adding metaData from producer", e, logPair("producer", aClass.getSimpleName()));
+            LOG.warn("Error evaluating a possible meta-data producer class", e, logPair("class", aClass.getSimpleName()));
          }
       }
 
@@ -89,8 +97,8 @@ public class MetaDataProducerHelper
       // after all other types (as apps often try to get other types from the instance)         //
       ////////////////////////////////////////////////////////////////////////////////////////////
       producers.sort(Comparator
-         .comparing((MetaDataProducer<?> p) -> p.getSortOrder())
-         .thenComparing((MetaDataProducer<?> p) ->
+         .comparing((MetaDataProducerInterface<?> p) -> p.getSortOrder())
+         .thenComparing((MetaDataProducerInterface<?> p) ->
          {
             try
             {
@@ -110,10 +118,12 @@ public class MetaDataProducerHelper
             }
          }));
 
-      //////////////////////////////////////////////////////////////
-      // execute each one, adding their meta data to the instance //
-      //////////////////////////////////////////////////////////////
-      for(MetaDataProducer<?> producer : producers)
+      ///////////////////////////////////////////////////////////////////////////
+      // execute each one (if enabled), adding their meta data to the instance //
+      ///////////////////////////////////////////////////////////////////////////
+      for(MetaDataProducerInterface<?> producer : producers)
+      {
+         if(producer.isEnabled())
          {
             try
             {
@@ -128,6 +138,11 @@ public class MetaDataProducerHelper
                LOG.warn("error executing metaDataProducer", logPair("producer", producer.getClass().getSimpleName()), e);
             }
          }
+         else
+         {
+            LOG.debug("Not using producer which is not enabled", logPair("producer", producer.getClass().getSimpleName()));
+         }
+      }
 
    }
 

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/metadata/MetaDataProducerHelperTest.java

@@ -23,8 +23,14 @@ package com.kingsrook.qqq.backend.core.model.metadata;
 
 
 import java.io.IOException;
+import com.kingsrook.qqq.backend.core.model.metadata.producers.TestAbstractMetaDataProducer;
+import com.kingsrook.qqq.backend.core.model.metadata.producers.TestDisabledMetaDataProducer;
+import com.kingsrook.qqq.backend.core.model.metadata.producers.TestImplementsMetaDataProducer;
 import com.kingsrook.qqq.backend.core.model.metadata.producers.TestMetaDataProducer;
+import com.kingsrook.qqq.backend.core.model.metadata.producers.TestNoInterfacesExtendsObject;
+import com.kingsrook.qqq.backend.core.model.metadata.producers.TestNoValidConstructorMetaDataProducer;
 import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 
@@ -43,6 +49,11 @@ class MetaDataProducerHelperTest
       QInstance qInstance = new QInstance();
       MetaDataProducerHelper.processAllMetaDataProducersInPackage(qInstance, "com.kingsrook.qqq.backend.core.model.metadata.producers");
       assertTrue(qInstance.getTables().containsKey(TestMetaDataProducer.NAME));
+      assertTrue(qInstance.getTables().containsKey(TestImplementsMetaDataProducer.NAME));
+      assertFalse(qInstance.getTables().containsKey(TestNoValidConstructorMetaDataProducer.NAME));
+      assertFalse(qInstance.getTables().containsKey(TestNoInterfacesExtendsObject.NAME));
+      assertFalse(qInstance.getTables().containsKey(TestAbstractMetaDataProducer.NAME));
+      assertFalse(qInstance.getTables().containsKey(TestDisabledMetaDataProducer.NAME));
    }
 
 }

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/metadata/producers/TestAbstractMetaDataProducer.java

@@ -0,0 +1,48 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model.metadata.producers;
+
+
+import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.model.metadata.MetaDataProducer;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+
+
+/*******************************************************************************
+ **
+ *******************************************************************************/
+public abstract class TestAbstractMetaDataProducer extends MetaDataProducer<QTableMetaData>
+{
+   public static final String NAME = "TestAbstractMetaDataProducer";
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   public QTableMetaData produce(QInstance qInstance) throws QException
+   {
+      return new QTableMetaData().withName(NAME);
+   }
+}

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/metadata/producers/TestDisabledMetaDataProducer.java

@@ -0,0 +1,59 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model.metadata.producers;
+
+
+import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.model.MetaDataProducerInterface;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+
+
+/*******************************************************************************
+ **
+ *******************************************************************************/
+public class TestDisabledMetaDataProducer implements MetaDataProducerInterface<QTableMetaData>
+{
+   public static final String NAME = "Disabled";
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   public boolean isEnabled()
+   {
+      return (false);
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   public QTableMetaData produce(QInstance qInstance) throws QException
+   {
+      return new QTableMetaData().withName(NAME);
+   }
+}

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/metadata/producers/TestImplementsMetaDataProducer.java

@@ -0,0 +1,48 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model.metadata.producers;
+
+
+import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.model.MetaDataProducerInterface;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+
+
+/*******************************************************************************
+ **
+ *******************************************************************************/
+public class TestImplementsMetaDataProducer implements MetaDataProducerInterface<QTableMetaData>
+{
+   public static final String NAME = "BuiltByProducerImplementingInterface";
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   public QTableMetaData produce(QInstance qInstance) throws QException
+   {
+      return new QTableMetaData().withName(NAME);
+   }
+}

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/metadata/producers/TestNoInterfacesExtendsObject.java

@@ -0,0 +1,46 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model.metadata.producers;
+
+
+import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+
+
+/*******************************************************************************
+ **
+ *******************************************************************************/
+public class TestNoInterfacesExtendsObject
+{
+   public static final String NAME = "TestNoInterfacesExtendsObject";
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   public QTableMetaData produce(QInstance qInstance) throws QException
+   {
+      return new QTableMetaData().withName(NAME);
+   }
+}

qqq-backend-core/src/test/java/com/kingsrook/qqq/backend/core/model/metadata/producers/TestNoValidConstructorMetaDataProducer.java

@@ -0,0 +1,58 @@
+/*
+ * QQQ - Low-code Application Framework for Engineers.
+ * Copyright (C) 2021-2023.  Kingsrook, LLC
+ * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
+ * contact@kingsrook.com
+ * https://github.com/Kingsrook/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.kingsrook.qqq.backend.core.model.metadata.producers;
+
+
+import com.kingsrook.qqq.backend.core.exceptions.QException;
+import com.kingsrook.qqq.backend.core.model.metadata.MetaDataProducer;
+import com.kingsrook.qqq.backend.core.model.metadata.QInstance;
+import com.kingsrook.qqq.backend.core.model.metadata.tables.QTableMetaData;
+
+
+/*******************************************************************************
+ **
+ *******************************************************************************/
+public class TestNoValidConstructorMetaDataProducer extends MetaDataProducer<QTableMetaData>
+{
+   public static final String NAME = "NoValidConstructor";
+
+
+
+   /*******************************************************************************
+    ** Constructor
+    **
+    *******************************************************************************/
+   public TestNoValidConstructorMetaDataProducer(boolean b)
+   {
+   }
+
+
+
+   /*******************************************************************************
+    **
+    *******************************************************************************/
+   @Override
+   public QTableMetaData produce(QInstance qInstance) throws QException
+   {
+      return new QTableMetaData().withName(NAME);
+   }
+}