X-Git-Url: http://git.argeo.org/?a=blobdiff_plain;f=cms%2Forg.argeo.slc.runtime%2Fsrc%2Forg%2Fargeo%2Fslc%2Fruntime%2FExecutionThread.java;fp=cms%2Forg.argeo.slc.runtime%2Fsrc%2Forg%2Fargeo%2Fslc%2Fruntime%2FExecutionThread.java;h=d940905f6aa022046eed302bfb4bfcb028b3ca22;hb=ecc22e604e47533c79de9cecdcdeacbc752cbff1;hp=0000000000000000000000000000000000000000;hpb=e07ded4632e53f8b8869763bc1f1f4091361e76e;p=gpl%2Fargeo-slc.git

diff --git a/cms/org.argeo.slc.runtime/src/org/argeo/slc/runtime/ExecutionThread.java b/cms/org.argeo.slc.runtime/src/org/argeo/slc/runtime/ExecutionThread.java
new file mode 100644
index 000000000..d940905f6
--- /dev/null
+++ b/cms/org.argeo.slc.runtime/src/org/argeo/slc/runtime/ExecutionThread.java
@@ -0,0 +1,116 @@
+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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