--- /dev/null
+/*\r
+ * Copyright (C) 2007-2012 Argeo GmbH\r
+ *\r
+ * Licensed under the Apache License, Version 2.0 (the "License");\r
+ * you may not use this file except in compliance with the License.\r
+ * You may obtain a copy of the License at\r
+ *\r
+ * http://www.apache.org/licenses/LICENSE-2.0\r
+ *\r
+ * Unless required by applicable law or agreed to in writing, software\r
+ * distributed under the License is distributed on an "AS IS" BASIS,\r
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ * See the License for the specific language governing permissions and\r
+ * limitations under the License.\r
+ */\r
+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
+import org.argeo.slc.execution.ExecutionSpecAttribute;\r
+\r
+/** Manage parameters that need to be set during the instantiation of a flow */\r
+public class InstantiationManager {\r
+\r
+ private final static Log log = LogFactory\r
+ .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
+ // set the flow name if it is DefaultExecutionFlow\r
+ if (flow instanceof DefaultExecutionFlow) {\r
+ ((DefaultExecutionFlow) flow).setBeanName(flowName);\r
+ }\r
+\r
+ if (log.isTraceEnabled())\r
+ log.trace("Start initialization of " + flow.hashCode() + " ("\r
+ + flow + " - " + flow.getClass() + ")");\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
+\r
+ if (flowStack.get() != null) {\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
+ } else {\r
+ // happens for flows imported as services\r
+ log.warn("flowInitializationFinished - Flow Stack is null");\r
+ }\r
+ }\r
+\r
+ protected ExecutionFlow findInitializingFlowWithParameter(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);\r
+ }\r
+ }\r
+ throw new SlcException("Key " + key + " is not set as parameter in "\r
+ + flowStack.get().firstElement().toString() + " (stack size="\r
+ + flowStack.get().size() + ")");\r
+\r
+ }\r
+\r
+ public Object getInitializingFlowParameter(String key) {\r
+ return findInitializingFlowWithParameter(key).getParameter(key);\r
+ }\r
+\r
+ public Class<?> getInitializingFlowParameterClass(String key) {\r
+ ExecutionSpecAttribute attr = findInitializingFlowWithParameter(key)\r
+ .getExecutionSpec().getAttributes().get(key);\r
+ if (attr instanceof RefSpecAttribute)\r
+ return ((RefSpecAttribute) attr).getTargetClass();\r
+ else if (attr instanceof PrimitiveSpecAttribute) {\r
+ String type = ((PrimitiveSpecAttribute) attr).getType();\r
+ Class<?> clss = PrimitiveUtils.typeAsClass(type);\r
+ if (clss == null)\r
+ throw new SlcException("Cannot convert type " + type\r
+ + " to class.");\r
+ return clss;\r
+ } else\r
+ return null;\r
+ }\r
+\r
+ public Boolean isInFlowInitialization() {\r
+ return (flowStack.get() != null) && !flowStack.get().empty();\r
+ }\r
+}\r