Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / genericrelation / ExternalRequest.java

diff --git a/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/ExternalRequest.java b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/ExternalRequest.java
new file mode 100644 (file)
index 0000000..77520aa
--- /dev/null
+++ b/bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/ExternalRequest.java
@@ -0,0 +1,45 @@
+package org.simantics.db.layer0.genericrelation;\r
+\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.Session;\r
+import org.simantics.db.common.request.ParametrizedPrimitiveRead;\r
+import org.simantics.db.layer0.adapter.GenericRelationIndex;\r
+import org.simantics.db.procedure.Listener;\r
+import org.simantics.utils.datastructures.Pair;\r
+\r
+class ExternalRequest extends ParametrizedPrimitiveRead<Pair<GenericRelationIndex,Resource>,Long> implements Runnable {\r
+\r
+    private static long value = 0;\r
+    private Session session;\r
+    private Listener<Long> procedure;\r
+\r
+    public ExternalRequest(GenericRelationIndex index, Resource model) {\r
+        super(Pair.make(index, model));\r
+    }\r
+\r
+    @Override\r
+    public void register(ReadGraph graph, Listener<Long> procedure) {\r
+        synchronized(getClass()) {\r
+            procedure.execute(value++);\r
+        }\r
+        if(procedure.isDisposed()) return;\r
+        assert(this.procedure == null);\r
+        this.session = graph.getSession();\r
+        this.procedure = procedure;\r
+        parameter.first.addListener(graph, parameter.second, this);\r
+    }\r
+    \r
+    @Override\r
+    public void unregistered() {\r
+        parameter.first.removeListener(session, parameter.second, this);\r
+    }\r
+    \r
+    @Override\r
+    public void run() {\r
+        synchronized(getClass()) {\r
+            procedure.execute(value++);\r
+        }\r
+    }\r
+    \r
+}
\ No newline at end of file