1 files changed, 150 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/timely/TimelyMailbox.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/timely/TimelyMailbox.java
new file mode 100644
index 00000000..bf3b8e14
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/network/mailbox/timely/TimelyMailbox.java
@@ -0,0 +1,150 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, 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.mailbox.timely;
+
+import java.util.Map;
+import java.util.TreeMap;
+
+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.rete.matcher.TimelyConfiguration.TimelineRepresentation;
+import tools.refinery.viatra.runtime.rete.network.Receiver;
+import tools.refinery.viatra.runtime.rete.network.ReteContainer;
+import tools.refinery.viatra.runtime.rete.network.communication.CommunicationGroup;
+import tools.refinery.viatra.runtime.rete.network.communication.MessageSelector;
+import tools.refinery.viatra.runtime.rete.network.communication.Timestamp;
+import tools.refinery.viatra.runtime.rete.network.communication.timely.ResumableNode;
+import tools.refinery.viatra.runtime.rete.network.mailbox.Mailbox;
+
+public class TimelyMailbox implements Mailbox {
+
+    protected TreeMap<Timestamp, Map<Tuple, Integer>> queue;
+    protected final Receiver receiver;
+    protected final ReteContainer container;
+    protected CommunicationGroup group;
+    protected boolean fallThrough;
+
+    public TimelyMailbox(final Receiver receiver, final ReteContainer container) {
+        this.receiver = receiver;
+        this.container = container;
+        this.queue = CollectionsFactory.createTreeMap();
+    }
+
+    protected TreeMap<Timestamp, Map<Tuple, Integer>> getActiveQueue() {
+        return this.queue;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return getActiveQueue().isEmpty();
+    }
+
+    @Override
+    public void postMessage(final Direction direction, final Tuple update, final Timestamp timestamp) {
+        final TreeMap<Timestamp, Map<Tuple, Integer>> activeQueue = getActiveQueue();
+
+        Map<Tuple, Integer> tupleMap = activeQueue.get(timestamp);
+        final boolean wasEmpty = tupleMap == null;
+        boolean significantChange = false;
+
+        if (tupleMap == null) {
+            tupleMap = CollectionsFactory.createMap();
+            activeQueue.put(timestamp, tupleMap);
+            significantChange = true;
+        }
+
+        Integer count = tupleMap.get(update);
+        if (count == null) {
+            count = 0;
+            significantChange = true;
+        }
+
+        if (direction == Direction.DELETE) {
+            count--;
+        } else {
+            count++;
+        }
+
+        if (count == 0) {
+            tupleMap.remove(update);
+            if (tupleMap.isEmpty()) {
+                activeQueue.remove(timestamp);
+            }
+            significantChange = true;
+        } else {
+            tupleMap.put(update, count);
+        }
+
+        if (significantChange) {
+            if (wasEmpty) {
+                this.group.notifyHasMessage(this, timestamp);
+            } else if (tupleMap.isEmpty()) {
+                final Timestamp resumableTimestamp = (this.receiver instanceof ResumableNode)
+                        ? ((ResumableNode) this.receiver).getResumableTimestamp()
+                        : null;
+                // check if there is folding left to do before unsubscribing just based on the message queue being empty
+                if (resumableTimestamp == null || resumableTimestamp.compareTo(timestamp) != 0) {
+                    this.group.notifyLostAllMessages(this, timestamp);
+                }
+            }
+        }
+    }
+
+    @Override
+    public void deliverAll(final MessageSelector selector) {
+        if (selector instanceof Timestamp) {
+            final Timestamp timestamp = (Timestamp) selector;
+            // REMOVE the tuples associated with the selector, dont just query them
+            final Map<Tuple, Integer> tupleMap = this.queue.remove(timestamp);
+
+            // tupleMap may be empty if we only have lazy folding to do
+            if (tupleMap != null) {
+                this.receiver.batchUpdate(tupleMap.entrySet(), timestamp);
+            }
+
+            if (this.container.getTimelyConfiguration()
+                    .getTimelineRepresentation() == TimelineRepresentation.FAITHFUL) {
+                // (1) either normal delivery, which ended up being a lazy folding state
+                // (2) and/or lazy folding needs to be resumed
+                if (this.receiver instanceof ResumableNode) {
+                    ((ResumableNode) this.receiver).resumeAt(timestamp);
+                }
+            }
+        } else {
+            throw new IllegalArgumentException("Unsupported message selector " + selector);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "DDF_MBOX (" + this.receiver + ") " + this.getActiveQueue();
+    }
+
+    @Override
+    public Receiver getReceiver() {
+        return this.receiver;
+    }
+
+    @Override
+    public void clear() {
+        this.queue.clear();
+    }
+
+    @Override
+    public CommunicationGroup getCurrentGroup() {
+        return this.group;
+    }
+
+    @Override
+    public void setCurrentGroup(final CommunicationGroup group) {
+        this.group = group;
+    }
+
+}