A bit of syntactic sugar for critical sections.

webapp/src/edu/cornell/mannlib/vitro/webapp/utils/jena/Critical.java

@@ -0,0 +1,39 @@
+/* $This file is distributed under the terms of the license in /doc/license.txt$ */
+
+package edu.cornell.mannlib.vitro.webapp.utils.jena;
+
+import static com.hp.hpl.jena.shared.Lock.READ;
+import static com.hp.hpl.jena.shared.Lock.WRITE;
+
+import com.hp.hpl.jena.rdf.model.Model;
+
+/**
+ * Use this in a try-with-resources block.
+ * 
+ * <pre>
+ * try (Critical section = Critical.read(model)) {
+ * }
+ * </pre>
+ */
+public class Critical implements AutoCloseable {
+	public static Critical read(Model model) {
+		return new Critical(model, READ);
+	}
+
+	public static Critical write(Model model) {
+		return new Critical(model, WRITE);
+	}
+	
+	private final Model model;
+
+	private Critical(Model model, boolean readLockRequested) {
+		this.model = model;
+		this.model.enterCriticalSection(readLockRequested);
+	}
+
+	@Override
+	public void close() {
+		this.model.leaveCriticalSection();
+	}
+
+}