org.argeo.slc.runtime/src/org/argeo/slc/runtime/InstantiationManager.java

   1 package org.argeo.slc.runtime;
   2
   3 import java.util.Stack;
   4
   5 import org.argeo.api.cms.CmsLog;
   6 import org.argeo.slc.SlcException;
   7 import org.argeo.slc.execution.ExecutionFlow;
   8 import org.argeo.slc.execution.ExecutionSpecAttribute;
   9 import org.argeo.slc.execution.RefSpecAttribute;
  10 import org.argeo.slc.primitive.PrimitiveSpecAttribute;
  11 import org.argeo.slc.primitive.PrimitiveUtils;
  12
  13 /** Manage parameters that need to be set during the instantiation of a flow */
  14 public class InstantiationManager {
  15
  16         private final static CmsLog log = CmsLog
  17                         .getLog(InstantiationManager.class);
  18
  19         private ThreadLocal<Stack<ExecutionFlow>> flowStack = new ThreadLocal<Stack<ExecutionFlow>>();
  20
  21         public Object createRef(String name) {
  22
  23                 if ((flowStack.get() == null) || flowStack.get().empty()) {
  24                         throw new SlcException("No flow is currently initializing."
  25                                         + " Declare ParameterRef as inner beans or prototypes.");
  26                 }
  27
  28                 return getInitializingFlowParameter(name);
  29         }
  30
  31         public void flowInitializationStarted(ExecutionFlow flow, String flowName) {
  32                 // set the flow name if it is DefaultExecutionFlow
  33                 if (flow instanceof DefaultExecutionFlow) {
  34                         ((DefaultExecutionFlow) flow).setName(flowName);
  35                 }
  36
  37                 if (log.isTraceEnabled())
  38                         log.trace("Start initialization of " + flow.hashCode() + " ("
  39                                         + flow + " - " + flow.getClass() + ")");
  40
  41                 // log.info("# flowInitializationStarted " + flowName);
  42                 // create a stack for this thread if there is none
  43                 if (flowStack.get() == null) {
  44                         flowStack.set(new Stack<ExecutionFlow>());
  45                 }
  46                 flowStack.get().push(flow);
  47         }
  48
  49         public void flowInitializationFinished(ExecutionFlow flow, String flowName) {
  50                 if (log.isTraceEnabled())
  51                         log.trace("Finish initialization of " + flow.hashCode() + " ("
  52                                         + flow + " - " + flow.getClass() + ")");
  53
  54                 if (flowStack.get() != null) {
  55                         ExecutionFlow registeredFlow = flowStack.get().pop();
  56                         if (registeredFlow != null) {
  57                                 if (!flow.getName().equals(registeredFlow.getName()))
  58                                         throw new SlcException("Current flow is " + flow);
  59                                 // log.info("# flowInitializationFinished " + flowName);
  60                                 // initializingFlow.set(null);
  61                         }
  62                 } else {
  63                         // happens for flows imported as services
  64                         log.warn("flowInitializationFinished - Flow Stack is null");
  65                 }
  66         }
  67
  68         protected ExecutionFlow findInitializingFlowWithParameter(String key) {
  69                 if ((flowStack.get() == null) || flowStack.get().empty())
  70                         throw new SlcException("No initializing flow available.");
  71
  72                 // first look in the outer flow (that may override parameters)
  73                 for (int i = 0; i < flowStack.get().size(); i++) {
  74                         if (flowStack.get().elementAt(i).isSetAsParameter(key)) {
  75                                 return flowStack.get().elementAt(i);
  76                         }
  77                 }
  78                 throw new SlcException("Key " + key + " is not set as parameter in "
  79                                 + flowStack.get().firstElement().toString() + " (stack size="
  80                                 + flowStack.get().size() + ")");
  81
  82         }
  83
  84         public Object getInitializingFlowParameter(String key) {
  85                 return findInitializingFlowWithParameter(key).getParameter(key);
  86         }
  87
  88         public Class<?> getInitializingFlowParameterClass(String key) {
  89                 ExecutionSpecAttribute attr = findInitializingFlowWithParameter(key)
  90                                 .getExecutionSpec().getAttributes().get(key);
  91                 if (attr instanceof RefSpecAttribute)
  92                         return ((RefSpecAttribute) attr).getTargetClass();
  93                 else if (attr instanceof PrimitiveSpecAttribute) {
  94                         String type = ((PrimitiveSpecAttribute) attr).getType();
  95                         Class<?> clss = PrimitiveUtils.typeAsClass(type);
  96                         if (clss == null)
  97                                 throw new SlcException("Cannot convert type " + type
  98                                                 + " to class.");
  99                         return clss;
 100                 } else
 101                         return null;
 102         }
 103
 104         public Boolean isInFlowInitialization() {
 105                 return (flowStack.get() != null) && !flowStack.get().empty();
 106         }
 107 }