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diff --git a/org.argeo.slc.spring/src/org/argeo/slc/core/execution/ProcessThreadGroup.java b/org.argeo.slc.spring/src/org/argeo/slc/core/execution/ProcessThreadGroup.java
new file mode 100644
index 000000000..17dbff83b
--- /dev/null
+++ b/org.argeo.slc.spring/src/org/argeo/slc/core/execution/ProcessThreadGroup.java
@@ -0,0 +1,68 @@
+/*
+ * 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.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+
+import org.argeo.slc.execution.ExecutionProcess;
+import org.argeo.slc.execution.ExecutionStep;
+
+/** The thread group attached to a given {@link SlcExecution}. */
+public class ProcessThreadGroup extends ThreadGroup {
+//	private final Authentication authentication;
+	private final static Integer STEPS_BUFFER_CAPACITY = 5000;
+
+	private BlockingQueue<ExecutionStep> steps = new ArrayBlockingQueue<ExecutionStep>(
+			STEPS_BUFFER_CAPACITY);
+
+	private Boolean hadAnError = false;
+
+	public ProcessThreadGroup(ExecutionProcess executionProcess) {
+		super("SLC Process #" + executionProcess.getUuid() + " thread group");
+//		this.authentication = SecurityContextHolder.getContext()
+//				.getAuthentication();
+	}
+
+//	public Authentication getAuthentication() {
+//		return authentication;
+//	}
+
+	public void dispatchAddStep(ExecutionStep step) {
+		// ExecutionProcess slcProcess = processThread.getProcess();
+		// List<ExecutionStep> steps = new ArrayList<ExecutionStep>();
+		// steps.add(step);
+		// TODO clarify why we don't dispatch steps, must be a reason
+		// dispatchAddSteps(steps);
+		// slcProcess.addSteps(steps);
+		if (step.getType().equals(ExecutionStep.ERROR))
+			hadAnError = true;
+		this.steps.add(step);
+	}
+
+	// public void dispatchAddSteps(List<ExecutionStep> steps) {
+	// ExecutionProcess slcProcess = processThread.getProcess();
+	// executionModulesManager.dispatchAddSteps(slcProcess, steps);
+	// }
+
+	public BlockingQueue<ExecutionStep> getSteps() {
+		return steps;
+	}
+
+	public Boolean hadAnError() {
+		return hadAnError;
+	}
+}