Move SLC Core

[gpl/argeo-slc.git] / org.argeo.slc.core / src / org / argeo / slc / core / execution / ExecutionThread.java

diff --git a/org.argeo.slc.core/src/org/argeo/slc/core/execution/ExecutionThread.java b/org.argeo.slc.core/src/org/argeo/slc/core/execution/ExecutionThread.java
new file mode 100644 (file)
index 0000000..48a5df3
--- /dev/null
+++ b/org.argeo.slc.core/src/org/argeo/slc/core/execution/ExecutionThread.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.argeo.slc.core.execution;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.slc.SlcException;
+import org.argeo.slc.execution.ExecutionFlowDescriptor;
+import org.argeo.slc.execution.ExecutionModulesManager;
+import org.argeo.slc.execution.ExecutionStep;
+import org.argeo.slc.execution.RealizedFlow;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+
+/** Thread of a single execution */
+public class ExecutionThread extends Thread {
+       public final static String SYSPROP_EXECUTION_AUTO_UPGRADE = "slc.execution.autoupgrade";
+       private final static Log log = LogFactory.getLog(ExecutionThread.class);
+
+       private ExecutionModulesManager executionModulesManager;
+       private final RealizedFlow realizedFlow;
+
+       private List<Runnable> destructionCallbacks = new ArrayList<Runnable>();
+
+       public ExecutionThread(ProcessThreadGroup processThreadGroup,
+                       ExecutionModulesManager executionModulesManager,
+                       RealizedFlow realizedFlow) {
+               super(processThreadGroup, "Flow "
+                               + realizedFlow.getFlowDescriptor().getName());
+               this.realizedFlow = realizedFlow;
+               this.executionModulesManager = executionModulesManager;
+       }
+
+       public void run() {
+               // authenticate thread
+               Authentication authentication = getProcessThreadGroup()
+                               .getAuthentication();
+               if (authentication == null)
+                       throw new SlcException("Can only execute authenticated threads");
+               SecurityContextHolder.getContext().setAuthentication(authentication);
+
+               // Retrieve execution flow descriptor
+               ExecutionFlowDescriptor executionFlowDescriptor = realizedFlow
+                               .getFlowDescriptor();
+               String flowName = executionFlowDescriptor.getName();
+
+               getProcessThreadGroup().dispatchAddStep(
+                               new ExecutionStep(realizedFlow.getModuleName(),
+                                               ExecutionStep.PHASE_START, "Flow " + flowName));
+
+               try {
+                       String autoUpgrade = System
+                                       .getProperty(SYSPROP_EXECUTION_AUTO_UPGRADE);
+                       if (autoUpgrade != null && autoUpgrade.equals("true"))
+                               executionModulesManager.upgrade(realizedFlow
+                                               .getModuleNameVersion());
+                       executionModulesManager.start(realizedFlow.getModuleNameVersion());
+                       //
+                       // START FLOW
+                       //
+                       executionModulesManager.execute(realizedFlow);
+                       // END FLOW
+               } catch (FlowConfigurationException e) {
+                       String msg = "Configuration problem with flow " + flowName + ":\n"
+                                       + e.getMessage();
+                       log.error(msg);
+                       getProcessThreadGroup().dispatchAddStep(
+                                       new ExecutionStep(realizedFlow.getModuleName(),
+                                                       ExecutionStep.ERROR, msg + " " + e.getMessage()));
+               } catch (Exception e) {
+                       // TODO: re-throw exception ?
+                       String msg = "Execution of flow " + flowName + " failed.";
+                       log.error(msg, e);
+                       getProcessThreadGroup().dispatchAddStep(
+                                       new ExecutionStep(realizedFlow.getModuleName(),
+                                                       ExecutionStep.ERROR, msg + " " + e.getMessage()));
+               } finally {
+                       getProcessThreadGroup().dispatchAddStep(
+                                       new ExecutionStep(realizedFlow.getModuleName(),
+                                                       ExecutionStep.PHASE_END, "Flow " + flowName));
+                       processDestructionCallbacks();
+               }
+       }
+
+       private synchronized void processDestructionCallbacks() {
+               for (int i = destructionCallbacks.size() - 1; i >= 0; i--) {
+                       try {
+                               destructionCallbacks.get(i).run();
+                       } catch (Exception e) {
+                               log.warn("Could not process destruction callback " + i
+                                               + " in thread " + getName(), e);
+                       }
+               }
+       }
+
+       /**
+        * Gather object destruction callback to be called in reverse order at the
+        * end of the thread
+        */
+       synchronized void registerDestructionCallback(String name, Runnable callback) {
+               destructionCallbacks.add(callback);
+       }
+
+       protected ProcessThreadGroup getProcessThreadGroup() {
+               return (ProcessThreadGroup) getThreadGroup();
+       }
+}
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