1 files changed, 123 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/StandardNode.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/StandardNode.java
new file mode 100644
index 00000000..7dc7c4bc
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/StandardNode.java
@@ -0,0 +1,123 @@
+/*******************************************************************************
+ * Copyright (c) 2004-2008 Gabor Bergmann and Daniel Varro
+ * Copyright (c) 2023 The Refinery Authors <https://refinery.tools>
+ * 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.network;
+
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.matchers.tuple.TupleMask;
+import tools.refinery.viatra.runtime.matchers.util.CollectionsFactory;
+import tools.refinery.viatra.runtime.matchers.util.Direction;
+import tools.refinery.viatra.runtime.rete.index.GenericProjectionIndexer;
+import tools.refinery.viatra.runtime.rete.index.ProjectionIndexer;
+import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
+import tools.refinery.viatra.runtime.rete.network.mailbox.Mailbox;
+import tools.refinery.viatra.runtime.rete.traceability.TraceInfo;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+/**
+ * Base implementation for a supplier node.
+ *
+ * @author Gabor Bergmann
+ *
+ */
+public abstract class StandardNode extends BaseNode implements Supplier, NetworkStructureChangeSensitiveNode {
+    protected final List<Receiver> children = CollectionsFactory.createObserverList();
+    /**
+     * @since 2.2
+     */
+    protected final List<Mailbox> childMailboxes = CollectionsFactory.createObserverList();
+
+    public StandardNode(final ReteContainer reteContainer) {
+        super(reteContainer);
+    }
+
+    /**
+     * @since 2.4
+     */
+    protected void propagateUpdate(final Direction direction, final Tuple updateElement, final Timestamp timestamp) {
+                reteContainer.checkCancelled();
+        for (final Mailbox childMailbox : childMailboxes) {
+            childMailbox.postMessage(direction, updateElement, timestamp);
+        }
+    }
+
+    @Override
+    public void appendChild(final Receiver receiver) {
+        children.add(receiver);
+        childMailboxes.add(this.getCommunicationTracker().proxifyMailbox(this, receiver.getMailbox()));
+    }
+
+    @Override
+    public void removeChild(final Receiver receiver) {
+        children.remove(receiver);
+        Mailbox mailboxToRemove = null;
+        for (final Mailbox mailbox : childMailboxes) {
+            if (mailbox.getReceiver() == receiver) {
+                mailboxToRemove = mailbox;
+                break;
+            }
+        }
+        assert mailboxToRemove != null;
+        childMailboxes.remove(mailboxToRemove);
+    }
+
+    @Override
+    public void networkStructureChanged() {
+        childMailboxes.clear();
+        for (final Receiver receiver : children) {
+            childMailboxes.add(this.getCommunicationTracker().proxifyMailbox(this, receiver.getMailbox()));
+        }
+    }
+
+    @Override
+    public Collection<Receiver> getReceivers() {
+        return children;
+    }
+
+    /**
+     * @since 2.2
+     */
+    public Collection<Mailbox> getChildMailboxes() {
+        return this.childMailboxes;
+    }
+
+    @Override
+    public Set<Tuple> getPulledContents(final boolean flush) {
+        final HashSet<Tuple> results = new HashSet<Tuple>();
+        pullInto(results, flush);
+        return results;
+    }
+
+    @Override
+    public ProjectionIndexer constructIndex(final TupleMask mask, final TraceInfo... traces) {
+        final GenericProjectionIndexer indexer = new GenericProjectionIndexer(reteContainer, mask);
+        for (final TraceInfo traceInfo : traces) {
+            indexer.assignTraceInfo(traceInfo);
+        }
+        reteContainer.connectAndSynchronize(this, indexer);
+        return indexer;
+    }
+
+    /**
+     * @since 1.6
+     */
+    protected void issueError(final String message, final Exception ex) {
+        if (ex == null) {
+            this.reteContainer.getNetwork().getEngine().getLogger().error(message);
+        } else {
+            this.reteContainer.getNetwork().getEngine().getLogger().error(message, ex);
+        }
+    }
+
+}