--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.truffle.api.test/src/com/oracle/truffle/api/test/instrument/InstrumentationTest.java	Tue Jan 27 20:28:19 2015 -0800
@@ -0,0 +1,721 @@
+/*
+ * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.api.test.instrument;
+
+import static org.junit.Assert.*;
+
+import java.util.*;
+
+import org.junit.*;
+
+import com.oracle.truffle.api.*;
+import com.oracle.truffle.api.frame.*;
+import com.oracle.truffle.api.instrument.*;
+import com.oracle.truffle.api.instrument.ProbeFailure.Reason;
+import com.oracle.truffle.api.instrument.ProbeNode.WrapperNode;
+import com.oracle.truffle.api.instrument.impl.*;
+import com.oracle.truffle.api.nodes.*;
+
+/**
+ * <h3>AST Instrumentation</h3>
+ *
+ * Instrumentation allows the insertion into Truffle ASTs language-specific instances of
+ * {@link WrapperNode} that propagate execution events through a {@link Probe} to any instances of
+ * {@link Instrument} that might be attached to the particular probe by tools.
+ * <ol>
+ * <li>Creates a simple add AST</li>
+ * <li>Verifies its structure</li>
+ * <li>"Probes" the add node by adding a {@link WrapperNode} and associated {@link Probe}</li>
+ * <li>Attaches a simple {@link Instrument} to the node via the Probe's {@link ProbeNode}</li>
+ * <li>Verifies the structure of the probed AST</li>
+ * <li>Verifies the execution of the probed AST</li>
+ * <li>Verifies the results observed by the instrument.</li>
+ * </ol>
+ * To do these tests, several required classes have been implemented in their most basic form, only
+ * implementing the methods necessary for the tests to pass, with stubs elsewhere.
+ */
+public class InstrumentationTest {
+
+    private static final SyntaxTag ADD_TAG = new SyntaxTag() {
+
+        @Override
+        public String name() {
+            return "Addition";
+        }
+
+        @Override
+        public String getDescription() {
+            return "Test Language Addition Node";
+        }
+    };
+
+    private static final SyntaxTag VALUE_TAG = new SyntaxTag() {
+
+        @Override
+        public String name() {
+            return "Value";
+        }
+
+        @Override
+        public String getDescription() {
+            return "Test Language Value Node";
+        }
+    };
+
+    @Test
+    public void testBasicInstrumentation() {
+        // Create a simple addition AST
+        final TruffleRuntime runtime = Truffle.getRuntime();
+        final TestValueNode leftValueNode = new TestValueNode(6);
+        final TestValueNode rightValueNode = new TestValueNode(7);
+        final TestAdditionNode addNode = new TestAdditionNode(leftValueNode, rightValueNode);
+
+        try {
+            addNode.probe();
+        } catch (ProbeException e) {
+            assertEquals(e.getFailure().getReason(), Reason.NO_PARENT);
+        }
+        final TestRootNode rootNode = new TestRootNode(addNode);
+
+        // Creating a call target sets the parent pointers in this tree and is necessary prior to
+        // checking any parent/child relationships
+        final CallTarget callTarget1 = runtime.createCallTarget(rootNode);
+
+        // Check the tree structure
+        assertEquals(addNode, leftValueNode.getParent());
+        assertEquals(addNode, rightValueNode.getParent());
+        Iterator<Node> iterator = addNode.getChildren().iterator();
+        assertEquals(leftValueNode, iterator.next());
+        assertEquals(rightValueNode, iterator.next());
+        assertFalse(iterator.hasNext());
+        assertEquals(rootNode, addNode.getParent());
+        iterator = rootNode.getChildren().iterator();
+        assertEquals(addNode, iterator.next());
+        assertFalse(iterator.hasNext());
+
+        // Ensure it executes correctly
+        assertEquals(13, callTarget1.call());
+
+        // Probe the addition node
+        final Probe probe = addNode.probe();
+
+        // Check the modified tree structure
+        assertEquals(addNode, leftValueNode.getParent());
+        assertEquals(addNode, rightValueNode.getParent());
+        iterator = addNode.getChildren().iterator();
+        assertEquals(leftValueNode, iterator.next());
+        assertEquals(rightValueNode, iterator.next());
+        assertFalse(iterator.hasNext());
+
+        // Ensure there's a WrapperNode correctly inserted into the AST
+        iterator = rootNode.getChildren().iterator();
+        Node wrapperNode = iterator.next();
+        assertTrue(wrapperNode instanceof TestLanguageWrapperNode);
+        assertFalse(iterator.hasNext());
+        assertEquals(rootNode, wrapperNode.getParent());
+
+        // Check that the WrapperNode has both the probe and the wrapped node as children
+        iterator = wrapperNode.getChildren().iterator();
+        assertEquals(addNode, iterator.next());
+        ProbeNode probeNode = (ProbeNode) iterator.next();
+        assertTrue(probeNode.getProbe() != null);
+        assertFalse(iterator.hasNext());
+
+        // Check that you can't probe the WrapperNodes
+        TestLanguageWrapperNode wrapper = (TestLanguageWrapperNode) wrapperNode;
+        try {
+            wrapper.probe();
+            fail();
+        } catch (ProbeException e) {
+            assertEquals(e.getFailure().getReason(), Reason.WRAPPER_NODE);
+        }
+
+        // Check that the "probed" AST still executes correctly
+        assertEquals(13, callTarget1.call());
+
+        // Attach a counting instrument to the probe
+        final TestCounter counterA = new TestCounter();
+        counterA.attach(probe);
+
+        // Attach a second counting instrument to the probe
+        final TestCounter counterB = new TestCounter();
+        counterB.attach(probe);
+
+        // Run it again and check that the two instruments are working
+        assertEquals(13, callTarget1.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 1);
+        assertEquals(counterB.leaveCount, 1);
+
+        // Remove counterA and check the "instrument chain"
+        counterA.dispose();
+        iterator = probeNode.getChildren().iterator();
+
+        // Run it again and check that instrument B is still working but not A
+        assertEquals(13, callTarget1.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 2);
+        assertEquals(counterB.leaveCount, 2);
+
+        // Simulate a split by cloning the AST
+        final CallTarget callTarget2 = runtime.createCallTarget((TestRootNode) rootNode.copy());
+        // Run the clone and check that instrument B is still working but not A
+        assertEquals(13, callTarget2.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 3);
+        assertEquals(counterB.leaveCount, 3);
+
+        // Run the original and check that instrument B is still working but not A
+        assertEquals(13, callTarget2.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 4);
+        assertEquals(counterB.leaveCount, 4);
+
+        // Attach a second instrument to the probe
+        final TestCounter counterC = new TestCounter();
+        counterC.attach(probe);
+
+        // Run the original and check that instruments B,C working but not A
+        assertEquals(13, callTarget1.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 5);
+        assertEquals(counterB.leaveCount, 5);
+        assertEquals(counterC.enterCount, 1);
+        assertEquals(counterC.leaveCount, 1);
+
+        // Run the clone and check that instruments B,C working but not A
+        assertEquals(13, callTarget2.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 6);
+        assertEquals(counterB.leaveCount, 6);
+        assertEquals(counterC.enterCount, 2);
+        assertEquals(counterC.leaveCount, 2);
+
+        // Remove instrumentC
+        counterC.dispose();
+
+        // Run the original and check that instrument B working but not A,C
+        assertEquals(13, callTarget1.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 7);
+        assertEquals(counterB.leaveCount, 7);
+        assertEquals(counterC.enterCount, 2);
+        assertEquals(counterC.leaveCount, 2);
+
+        // Run the clone and check that instrument B working but not A,C
+        assertEquals(13, callTarget2.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 8);
+        assertEquals(counterB.leaveCount, 8);
+        assertEquals(counterC.enterCount, 2);
+        assertEquals(counterC.leaveCount, 2);
+
+        // Remove instrumentB
+        counterB.dispose();
+
+        // Run both the original and clone, check that no instruments working
+        assertEquals(13, callTarget1.call());
+        assertEquals(13, callTarget2.call());
+        assertEquals(counterA.enterCount, 1);
+        assertEquals(counterA.leaveCount, 1);
+        assertEquals(counterB.enterCount, 8);
+        assertEquals(counterB.leaveCount, 8);
+        assertEquals(counterC.enterCount, 2);
+        assertEquals(counterC.leaveCount, 2);
+    }
+
+    @Test
+    public void testTagging() {
+
+        // Applies appropriate tags
+        final TestASTProber astProber = new TestASTProber();
+        Probe.registerASTProber(astProber);
+
+        // Listens for probes and tags being added
+        final TestProbeListener probeListener = new TestProbeListener();
+        Probe.addProbeListener(probeListener);
+
+        // Counts all entries to all instances of addition nodes
+        final TestMultiCounter additionCounter = new TestMultiCounter();
+
+        // Counts all entries to all instances of value nodes
+        final TestMultiCounter valueCounter = new TestMultiCounter();
+
+        // Create a simple addition AST
+        final TruffleRuntime runtime = Truffle.getRuntime();
+        final TestValueNode leftValueNode = new TestValueNode(6);
+        final TestValueNode rightValueNode = new TestValueNode(7);
+        final TestAdditionNode addNode = new TestAdditionNode(leftValueNode, rightValueNode);
+
+        final TestRootNode rootNode = new TestRootNode(addNode);
+
+        final CallTarget callTarget = runtime.createCallTarget(rootNode);
+
+        // Check that the prober added probes to the tree
+        assertEquals(probeListener.probeCount, 3);
+        assertEquals(probeListener.tagCount, 3);
+
+        assertEquals(Probe.findProbesTaggedAs(ADD_TAG).size(), 1);
+        assertEquals(Probe.findProbesTaggedAs(VALUE_TAG).size(), 2);
+
+        // Check that it executes correctly
+        assertEquals(13, callTarget.call());
+
+        // Dynamically attach a counter for all executions of all Addition nodes
+        for (Probe probe : Probe.findProbesTaggedAs(ADD_TAG)) {
+            additionCounter.attachCounter(probe);
+        }
+        // Dynamically attach a counter for all executions of all Value nodes
+        for (Probe probe : Probe.findProbesTaggedAs(VALUE_TAG)) {
+            valueCounter.attachCounter(probe);
+        }
+
+        // Counters initialized at 0
+        assertEquals(additionCounter.count, 0);
+        assertEquals(valueCounter.count, 0);
+
+        // Execute again
+        assertEquals(13, callTarget.call());
+
+        // There are two value nodes in the AST, but only one addition node
+        assertEquals(additionCounter.count, 1);
+        assertEquals(valueCounter.count, 2);
+
+        Probe.unregisterASTProber(astProber);
+
+    }
+
+    @Test
+    public void testProbeLite() {
+
+        // Use the "lite-probing" option, limited to a single pass of
+        // probing and a single Instrument at each probed node. This
+        // particular test uses a shared event receiver at every
+        // lite-probed node.
+        final TestEventReceiver receiver = new TestEventReceiver();
+
+        TestASTLiteProber astLiteProber = new TestASTLiteProber(receiver);
+        Probe.registerASTProber(astLiteProber);
+
+        // Create a simple addition AST
+        final TruffleRuntime runtime = Truffle.getRuntime();
+        final TestValueNode leftValueNode = new TestValueNode(6);
+        final TestValueNode rightValueNode = new TestValueNode(7);
+        final TestAdditionNode addNode = new TestAdditionNode(leftValueNode, rightValueNode);
+        final TestRootNode rootNode = new TestRootNode(addNode);
+
+        // Creating a call target sets the parent pointers in this tree and is necessary prior to
+        // checking any parent/child relationships
+        final CallTarget callTarget = runtime.createCallTarget(rootNode);
+
+        // Check that the instrument is working as expected.
+        assertEquals(0, receiver.counter);
+        callTarget.call();
+        assertEquals(2, receiver.counter);
+
+        // Check that you can't probe a node that's already received a probeLite() call
+        try {
+            leftValueNode.probe();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+
+        try {
+            rightValueNode.probe();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+
+        // Check tree structure
+        assertTrue(leftValueNode.getParent() instanceof TestLanguageWrapperNode);
+        assertTrue(rightValueNode.getParent() instanceof TestLanguageWrapperNode);
+        TestLanguageWrapperNode leftWrapper = (TestLanguageWrapperNode) leftValueNode.getParent();
+        TestLanguageWrapperNode rightWrapper = (TestLanguageWrapperNode) rightValueNode.getParent();
+        assertEquals(addNode, leftWrapper.getParent());
+        assertEquals(addNode, rightWrapper.getParent());
+        Iterator<Node> iterator = addNode.getChildren().iterator();
+        assertEquals(leftWrapper, iterator.next());
+        assertEquals(rightWrapper, iterator.next());
+        assertFalse(iterator.hasNext());
+        assertEquals(rootNode, addNode.getParent());
+        iterator = rootNode.getChildren().iterator();
+        assertEquals(addNode, iterator.next());
+        assertFalse(iterator.hasNext());
+
+        // Check that you can't get a probe on the wrappers because they were "lite-probed"
+        try {
+            leftWrapper.getProbe();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+        try {
+            rightWrapper.getProbe();
+            fail();
+        } catch (IllegalStateException e) {
+        }
+
+        // Check that you can't probe the wrappers
+        try {
+            leftWrapper.probe();
+            fail();
+        } catch (ProbeException e) {
+            assertEquals(e.getFailure().getReason(), ProbeFailure.Reason.WRAPPER_NODE);
+        }
+        try {
+            rightWrapper.probe();
+            fail();
+        } catch (ProbeException e) {
+            assertEquals(e.getFailure().getReason(), ProbeFailure.Reason.WRAPPER_NODE);
+        }
+        try {
+            leftWrapper.probeLite(null);
+            fail();
+        } catch (ProbeException e) {
+            assertEquals(e.getFailure().getReason(), ProbeFailure.Reason.WRAPPER_NODE);
+        }
+        try {
+            rightWrapper.probeLite(null);
+            fail();
+        } catch (ProbeException e) {
+            assertEquals(e.getFailure().getReason(), ProbeFailure.Reason.WRAPPER_NODE);
+        }
+
+        // Use reflection to check that each WrapperNode has a ProbeLiteNode with a
+        // SimpleEventReceiver
+        try {
+            java.lang.reflect.Field probeNodeField = leftWrapper.getClass().getDeclaredField("probeNode");
+
+            // cheat: probeNode is private, so we change it's accessibility at runtime
+            probeNodeField.setAccessible(true);
+            ProbeNode probeNode = (ProbeNode) probeNodeField.get(leftWrapper);
+
+            // hack: Since ProbeLiteNode is not visible, we do a string compare here
+            assertTrue(probeNode.getClass().toString().endsWith("ProbeLiteNode"));
+
+            // Now we do the same to check the type of the eventReceiver in ProbeLiteNode
+            java.lang.reflect.Field eventReceiverField = probeNode.getClass().getDeclaredField("eventReceiver");
+            eventReceiverField.setAccessible(true);
+            TruffleEventReceiver eventReceiver = (TruffleEventReceiver) eventReceiverField.get(probeNode);
+            assertTrue(eventReceiver instanceof SimpleEventReceiver);
+
+            // Reset accessibility
+            probeNodeField.setAccessible(false);
+            eventReceiverField.setAccessible(false);
+
+        } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
+            fail();
+        }
+
+        Probe.unregisterASTProber(astLiteProber);
+
+    }
+
+    private abstract class TestLanguageNode extends Node {
+        public abstract Object execute(VirtualFrame frame);
+
+        @Override
+        public boolean isInstrumentable() {
+            return true;
+        }
+
+        @Override
+        public WrapperNode createWrapperNode() {
+            return new TestLanguageWrapperNode(this);
+        }
+    }
+
+    @NodeInfo(cost = NodeCost.NONE)
+    private class TestLanguageWrapperNode extends TestLanguageNode implements WrapperNode {
+        @Child private TestLanguageNode child;
+        @Child private ProbeNode probeNode;
+
+        public TestLanguageWrapperNode(TestLanguageNode child) {
+            assert !(child instanceof TestLanguageWrapperNode);
+            this.child = child;
+        }
+
+        @Override
+        public String instrumentationInfo() {
+            return "Wrapper node for testing";
+        }
+
+        @Override
+        public boolean isInstrumentable() {
+            return false;
+        }
+
+        @Override
+        public void insertProbe(ProbeNode newProbeNode) {
+            this.probeNode = newProbeNode;
+        }
+
+        @Override
+        public Probe getProbe() {
+            try {
+                return probeNode.getProbe();
+            } catch (IllegalStateException e) {
+                throw new IllegalStateException("Cannot call getProbe() on a wrapper that has no probe");
+            }
+        }
+
+        @Override
+        public Node getChild() {
+            return child;
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            probeNode.enter(child, frame);
+            Object result;
+
+            try {
+                result = child.execute(frame);
+                probeNode.returnValue(child, frame, result);
+            } catch (KillException e) {
+                throw (e);
+            } catch (Exception e) {
+                probeNode.returnExceptional(child, frame, e);
+                throw (e);
+            }
+
+            return result;
+        }
+    }
+
+    /**
+     * A simple node for our test language to store a value.
+     */
+    private class TestValueNode extends TestLanguageNode {
+        private final int value;
+
+        public TestValueNode(int value) {
+            this.value = value;
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            return new Integer(this.value);
+        }
+    }
+
+    /**
+     * A node for our test language that adds up two {@link TestValueNode}s.
+     */
+    private class TestAdditionNode extends TestLanguageNode {
+        @Child private TestLanguageNode leftChild;
+        @Child private TestLanguageNode rightChild;
+
+        public TestAdditionNode(TestValueNode leftChild, TestValueNode rightChild) {
+            this.leftChild = insert(leftChild);
+            this.rightChild = insert(rightChild);
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            return new Integer(((Integer) leftChild.execute(frame)).intValue() + ((Integer) rightChild.execute(frame)).intValue());
+        }
+    }
+
+    /**
+     * Truffle requires that all guest languages to have a {@link RootNode} which sits atop any AST
+     * of the guest language. This is necessary since creating a {@link CallTarget} is how Truffle
+     * completes an AST. The root nodes serves as our entry point into a program.
+     */
+    private class TestRootNode extends RootNode {
+        @Child private TestLanguageNode body;
+
+        /**
+         * This constructor emulates the global machinery that applies registered probers to every
+         * newly created AST. Global registry is not used, since that would interfere with other
+         * tests run in the same environment.
+         */
+        public TestRootNode(TestLanguageNode body) {
+            super(null);
+            this.body = body;
+        }
+
+        @Override
+        public Object execute(VirtualFrame frame) {
+            return body.execute(frame);
+        }
+
+        @Override
+        public boolean isCloningAllowed() {
+            return true;
+        }
+
+        @Override
+        public void applyInstrumentation() {
+            Probe.applyASTProbers(body);
+        }
+    }
+
+    /**
+     * A counter for the number of times execution enters and leaves a probed AST node.
+     */
+    private class TestCounter {
+
+        public int enterCount = 0;
+        public int leaveCount = 0;
+        public final Instrument instrument;
+
+        public TestCounter() {
+            instrument = Instrument.create(new SimpleEventReceiver() {
+
+                @Override
+                public void enter(Node node, VirtualFrame frame) {
+                    enterCount++;
+                }
+
+                @Override
+                public void returnAny(Node node, VirtualFrame frame) {
+                    leaveCount++;
+                }
+            }, "Instrumentation Test Counter");
+        }
+
+        public void attach(Probe probe) {
+            probe.attach(instrument);
+        }
+
+        public void dispose() {
+            instrument.dispose();
+        }
+
+    }
+
+    /**
+     * Tags selected nodes on newly constructed ASTs.
+     */
+    private static final class TestASTProber implements NodeVisitor, ASTProber {
+
+        @Override
+        public boolean visit(Node node) {
+            if (node instanceof TestLanguageNode) {
+
+                final TestLanguageNode testNode = (TestLanguageNode) node;
+
+                if (node instanceof TestValueNode) {
+                    testNode.probe().tagAs(VALUE_TAG, null);
+
+                } else if (node instanceof TestAdditionNode) {
+                    testNode.probe().tagAs(ADD_TAG, null);
+
+                }
+            }
+            return true;
+        }
+
+        @Override
+        public void probeAST(Node node) {
+            node.accept(this);
+        }
+    }
+
+    /**
+     * "lite-probes" every value node with a shared event receiver.
+     */
+    private static final class TestASTLiteProber implements NodeVisitor, ASTProber {
+        private final TruffleEventReceiver eventReceiver;
+
+        public TestASTLiteProber(SimpleEventReceiver simpleEventReceiver) {
+            this.eventReceiver = simpleEventReceiver;
+        }
+
+        public boolean visit(Node node) {
+            if (node instanceof TestValueNode) {
+                final TestLanguageNode testNode = (TestValueNode) node;
+                testNode.probeLite(eventReceiver);
+            }
+            return true;
+        }
+
+        public void probeAST(Node node) {
+            node.accept(this);
+        }
+    }
+
+    /**
+     * Counts the number of "enter" events at probed nodes.
+     *
+     */
+    static final class TestEventReceiver extends SimpleEventReceiver {
+
+        public int counter = 0;
+
+        @Override
+        public void enter(Node node, VirtualFrame frame) {
+            counter++;
+        }
+
+    }
+
+    /**
+     * A counter that can count executions at multiple nodes; it attaches a separate instrument at
+     * each Probe, but keeps a total count.
+     */
+    private static final class TestMultiCounter {
+
+        public int count = 0;
+
+        public void attachCounter(Probe probe) {
+
+            // Attach a new instrument for every Probe
+            // where we want to count executions.
+            // it will get copied when ASTs cloned, so
+            // keep the count in this outer class.
+            probe.attach(Instrument.create(new SimpleEventReceiver() {
+
+                @Override
+                public void enter(Node node, VirtualFrame frame) {
+                    count++;
+                }
+            }, "Instrumentation Test MultiCounter"));
+        }
+    }
+
+    private static final class TestProbeListener extends DefaultProbeListener {
+
+        public int probeCount = 0;
+        public int tagCount = 0;
+
+        @Override
+        public void newProbeInserted(Probe probe) {
+            probeCount++;
+        }
+
+        @Override
+        public void probeTaggedAs(Probe probe, SyntaxTag tag, Object tagValue) {
+            tagCount++;
+        }
+    }
+
+}