Restructure modules

[gpl/argeo-slc.git] / runtime / org.argeo.slc.core / src / main / java / org / argeo / slc / core / execution / InstantiationManager.java

diff --git a/runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/InstantiationManager.java b/runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/InstantiationManager.java
new file mode 100644 (file)
index 0000000..c3d844c
--- /dev/null
+++ b/runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/InstantiationManager.java
@@ -0,0 +1,74 @@
+package org.argeo.slc.core.execution;\r
+\r
+import java.util.Stack;\r
+\r
+import org.apache.commons.logging.Log;\r
+import org.apache.commons.logging.LogFactory;\r
+import org.argeo.slc.SlcException;\r
+import org.argeo.slc.execution.ExecutionFlow;\r
+\r
+public class InstantiationManager {\r
+\r
+       private final static Log log = LogFactory.getLog(InstantiationManager.class);\r
+       \r
+       private ThreadLocal<Stack<ExecutionFlow> > flowStack = new ThreadLocal<Stack<ExecutionFlow> >();\r
+       \r
+       public Object createRef(String name) {\r
+               \r
+               if((flowStack.get() == null) ||  flowStack.get().empty()) {\r
+                       throw new SlcException("No flow is currently initializing."\r
+                                       + " Declare ParameterRef as inner beans or prototypes.");\r
+               }\r
+               \r
+               return getInitializingFlowParameter(name);\r
+       }       \r
+       \r
+       public void flowInitializationStarted(ExecutionFlow flow, String flowName) {\r
+               if (log.isTraceEnabled())\r
+                       log.trace("Start initialization of " + flow.hashCode() + " ("\r
+                                       + flow + " - " + flow.getClass() + ")");\r
+               \r
+               // set the flow name if it is DefaultExecutionFlow\r
+               if(flow instanceof DefaultExecutionFlow) {\r
+                       ((DefaultExecutionFlow) flow).setBeanName(flowName);\r
+               }\r
+               \r
+//             log.info("# flowInitializationStarted " + flowName);\r
+               // create a stack for this thread if there is none\r
+               if(flowStack.get() == null) {\r
+                       flowStack.set(new Stack<ExecutionFlow>());\r
+               }\r
+               flowStack.get().push(flow);\r
+       }\r
+\r
+       public void flowInitializationFinished(ExecutionFlow flow, String flowName) {\r
+               if (log.isTraceEnabled())\r
+                       log.trace("Finish initialization of " + flow.hashCode() + " ("\r
+                                       + flow + " - " + flow.getClass() + ")");\r
+               ExecutionFlow registeredFlow = flowStack.get().pop();\r
+               if (registeredFlow != null) {\r
+                       if (!flow.getName().equals(registeredFlow.getName()))\r
+                               throw new SlcException("Current flow is " + flow);\r
+//                     log.info("# flowInitializationFinished " + flowName);\r
+//                     initializingFlow.set(null);\r
+               }\r
+       }       \r
+       \r
+       public Object getInitializingFlowParameter(String key) {\r
+               if ((flowStack.get() == null) || flowStack.get().empty())\r
+                       throw new SlcException("No initializing flow available.");\r
+               \r
+               // first look in the outer flow (that may override parameters)\r
+               for(int i = 0; i < flowStack.get().size(); i++) {\r
+                       if(flowStack.get().elementAt(i).isSetAsParameter(key)) {\r
+                               return flowStack.get().elementAt(i).getParameter(key);\r
+                       }\r
+               }\r
+               throw new SlcException("Key " + key + " is not set as parameter in "\r
+                               + flowStack.get().firstElement().toString() + " (stack size="+flowStack.get().size()+")");              \r
+       }\r
+\r
+       public Boolean isInFlowInitialization() {\r
+               return (flowStack.get() != null) && !flowStack.get().empty();\r
+       }       \r
+}\r