--- /dev/null
+package org.argeo.slc.runtime;
+
+import java.security.AccessControlContext;
+import java.security.AccessController;
+import java.security.PrivilegedActionException;
+import java.security.PrivilegedExceptionAction;
+import java.util.ArrayList;
+import java.util.List;
+
+import javax.security.auth.Subject;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.slc.execution.ExecutionFlowDescriptor;
+import org.argeo.slc.execution.ExecutionModulesManager;
+import org.argeo.slc.execution.ExecutionStep;
+import org.argeo.slc.execution.FlowConfigurationException;
+import org.argeo.slc.execution.RealizedFlow;
+
+/** 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 final AccessControlContext accessControlContext;
+
+ 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;
+ accessControlContext = AccessController.getContext();
+ }
+
+ 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 {
+ Subject subject = Subject.getSubject(accessControlContext);
+ try {
+ Subject.doAs(subject, new PrivilegedExceptionAction<Void>() {
+
+ @Override
+ public Void run() throws Exception {
+ 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
+ return null;
+ }
+
+ });
+ } catch (PrivilegedActionException privilegedActionException) {
+ throw (Exception) privilegedActionException.getCause();
+ }
+ } 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
+ */
+ public synchronized void registerDestructionCallback(String name, Runnable callback) {
+ destructionCallbacks.add(callback);
+ }
+
+ protected ProcessThreadGroup getProcessThreadGroup() {
+ return (ProcessThreadGroup) getThreadGroup();
+ }
+}
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