+/*
+ * 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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