1 files changed, 81 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/delayed/DelayedCommand.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/delayed/DelayedCommand.java
new file mode 100644
index 00000000..d6312671
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/delayed/DelayedCommand.java
@@ -0,0 +1,81 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2019, Tamas Szabo, Istvan Rath and Daniel Varro
+ * 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.delayed;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+import tools.refinery.viatra.runtime.matchers.util.Direction;
+import tools.refinery.viatra.runtime.matchers.util.Signed;
+import tools.refinery.viatra.runtime.matchers.util.timeline.Timeline;
+import tools.refinery.viatra.runtime.rete.network.Network;
+import tools.refinery.viatra.runtime.rete.network.Node;
+import tools.refinery.viatra.runtime.rete.network.Receiver;
+import tools.refinery.viatra.runtime.rete.network.ReteContainer;
+import tools.refinery.viatra.runtime.rete.network.Supplier;
+import tools.refinery.viatra.runtime.rete.network.communication.CommunicationTracker;
+import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
+import tools.refinery.viatra.runtime.rete.network.mailbox.Mailbox;
+
+/**
+ * Instances of this class are responsible for initializing a {@link Receiver} with the contents of a {@link Supplier}.
+ * However, due to the dynamic nature of the Rete {@link Network} and to the fact that certain {@link Node}s in the
+ * {@link Network} are sensitive to the shape of the {@link Network}, the commands must be delayed until the
+ * construction of the {@link Network} has stabilized.
+ * 
+ * @author Tamas Szabo
+ * @since 2.3
+ */
+public abstract class DelayedCommand implements Runnable {
+
+    protected final Supplier supplier;
+    protected final Receiver receiver;
+    protected final Direction direction;
+    protected final ReteContainer container;
+
+    public DelayedCommand(final Supplier supplier, final Receiver receiver, final Direction direction,
+            final ReteContainer container) {
+        this.supplier = supplier;
+        this.receiver = receiver;
+        this.direction = direction;
+        this.container = container;
+    }
+
+    @Override
+    public void run() {
+        final CommunicationTracker tracker = this.container.getCommunicationTracker();
+        final Mailbox mailbox = tracker.proxifyMailbox(this.supplier, this.receiver.getMailbox());
+
+        if (this.isTimestampAware()) {
+            final Map<Tuple, Timeline<Timestamp>> contents = this.container.pullContentsWithTimeline(this.supplier,
+                    false);
+            for (final Entry<Tuple, Timeline<Timestamp>> entry : contents.entrySet()) {
+                for (final Signed<Timestamp> change : entry.getValue().asChangeSequence()) {
+                    mailbox.postMessage(change.getDirection().multiply(this.direction), entry.getKey(),
+                            change.getPayload());
+                }
+            }
+        } else {
+            final Collection<Tuple> contents = this.container.pullContents(this.supplier, false);
+            for (final Tuple tuple : contents) {
+                mailbox.postMessage(this.direction, tuple, Timestamp.ZERO);
+            }
+        }
+    }
+
+    @Override
+    public String toString() {
+        return this.supplier + " -> " + this.receiver.toString();
+    }
+
+    protected abstract boolean isTimestampAware();
+
+}