1 files changed, 154 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/DiscriminatorDispatcherNode.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/DiscriminatorDispatcherNode.java
new file mode 100644
index 00000000..a8e11fcd
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/single/DiscriminatorDispatcherNode.java
@@ -0,0 +1,154 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Gabor Bergmann, IncQueryLabs Ltd.
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.rete.single;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import tools.refinery.viatra.runtime.matchers.context.IQueryRuntimeContext;
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
+import tools.refinery.viatra.runtime.matchers.util.Direction;
+import tools.refinery.viatra.runtime.matchers.util.timeline.Timeline;
+import tools.refinery.viatra.runtime.rete.network.NetworkStructureChangeSensitiveNode;
+import tools.refinery.viatra.runtime.rete.network.Receiver;
+import tools.refinery.viatra.runtime.rete.network.ReteContainer;
+import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
+import tools.refinery.viatra.runtime.rete.network.mailbox.Mailbox;
+
+/**
+ * Node that sends tuples off to different buckets (attached as children of type {@link DiscriminatorBucketNode}), based
+ * on the value of a given column.
+ * 
+ * <p>
+ * Tuple contents and bucket keys have already been wrapped using {@link IQueryRuntimeContext#wrapElement(Object)}
+ * 
+ * @author Gabor Bergmann
+ * @since 1.5
+ */
+public class DiscriminatorDispatcherNode extends SingleInputNode implements NetworkStructureChangeSensitiveNode {
+
+    private int discriminationColumnIndex;
+    private Map<Object, DiscriminatorBucketNode> buckets = new HashMap<>();
+    private Map<Object, Mailbox> bucketMailboxes = new HashMap<>();
+
+    /**
+     * @param reteContainer
+     */
+    public DiscriminatorDispatcherNode(ReteContainer reteContainer, int discriminationColumnIndex) {
+        super(reteContainer);
+        this.discriminationColumnIndex = discriminationColumnIndex;
+    }
+
+    @Override
+    public void update(Direction direction, Tuple updateElement, Timestamp timestamp) {
+        Object dispatchKey = updateElement.get(discriminationColumnIndex);
+        Mailbox bucketMailBox = bucketMailboxes.get(dispatchKey);
+        if (bucketMailBox != null) {
+            bucketMailBox.postMessage(direction, updateElement, timestamp);
+        }
+    }
+
+    public int getDiscriminationColumnIndex() {
+        return discriminationColumnIndex;
+    }
+
+    @Override
+    public void pullInto(final Collection<Tuple> collector, final boolean flush) {
+        propagatePullInto(collector, flush);
+    }
+
+    @Override
+    public void pullIntoWithTimeline(final Map<Tuple, Timeline<Timestamp>> collector, final boolean flush) {
+        propagatePullIntoWithTimestamp(collector, flush);
+    }
+
+    /**
+     * @since 2.3
+     */
+    public void pullIntoFiltered(final Collection<Tuple> collector, final Object bucketKey, final boolean flush) {
+        final ArrayList<Tuple> unfiltered = new ArrayList<Tuple>();
+        propagatePullInto(unfiltered, flush);
+        for (Tuple tuple : unfiltered) {
+            if (bucketKey.equals(tuple.get(discriminationColumnIndex))) {
+                collector.add(tuple);
+            }
+        }
+    }
+
+    /**
+     * @since 2.3
+     */
+    public void pullIntoWithTimestampFiltered(final Map<Tuple, Timeline<Timestamp>> collector, final Object bucketKey,
+            final boolean flush) {
+        final Map<Tuple, Timeline<Timestamp>> unfiltered = CollectionsFactory.createMap();
+        propagatePullIntoWithTimestamp(unfiltered, flush);
+        for (final Entry<Tuple, Timeline<Timestamp>> entry : unfiltered.entrySet()) {
+            if (bucketKey.equals(entry.getKey().get(discriminationColumnIndex))) {
+                collector.put(entry.getKey(), entry.getValue());
+            }
+        }
+    }
+
+    @Override
+    public void appendChild(Receiver receiver) {
+        super.appendChild(receiver);
+        if (receiver instanceof DiscriminatorBucketNode) {
+            DiscriminatorBucketNode bucket = (DiscriminatorBucketNode) receiver;
+            Object bucketKey = bucket.getBucketKey();
+            DiscriminatorBucketNode old = buckets.put(bucketKey, bucket);
+            if (old != null) {
+                throw new IllegalStateException();
+            }
+            bucketMailboxes.put(bucketKey, this.getCommunicationTracker().proxifyMailbox(this, bucket.getMailbox()));
+        }
+    }
+
+    /**
+     * @since 2.2
+     */
+    public Map<Object, Mailbox> getBucketMailboxes() {
+        return this.bucketMailboxes;
+    }
+
+    @Override
+    public void networkStructureChanged() {
+        bucketMailboxes.clear();
+        for (Receiver receiver : children) {
+            if (receiver instanceof DiscriminatorBucketNode) {
+                DiscriminatorBucketNode bucket = (DiscriminatorBucketNode) receiver;
+                Object bucketKey = bucket.getBucketKey();
+                bucketMailboxes.put(bucketKey,
+                        this.getCommunicationTracker().proxifyMailbox(this, bucket.getMailbox()));
+            }
+        }
+    }
+
+    @Override
+    public void removeChild(Receiver receiver) {
+        super.removeChild(receiver);
+        if (receiver instanceof DiscriminatorBucketNode) {
+            DiscriminatorBucketNode bucket = (DiscriminatorBucketNode) receiver;
+            Object bucketKey = bucket.getBucketKey();
+            DiscriminatorBucketNode old = buckets.remove(bucketKey);
+            if (old != bucket)
+                throw new IllegalStateException();
+            bucketMailboxes.remove(bucketKey);
+        }
+    }
+
+    @Override
+    protected String toStringCore() {
+        return super.toStringCore() + '<' + discriminationColumnIndex + '>';
+    }
+
+}