diff -r 7b751fe181a5 -r bc54ed8d908a src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/ObjectContext.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/ObjectContext.java	Mon Sep 16 09:45:22 2019 +0200
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.jfr.internal.consumer;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import jdk.jfr.EventType;
+import jdk.jfr.ValueDescriptor;
+
+public final class ObjectContext {
+    private final Map<ValueDescriptor, ObjectContext> contextLookup;
+
+    public final EventType eventType;
+    public final List<ValueDescriptor> fields;
+    public final TimeConverter timeConverter;
+
+    public ObjectContext(EventType eventType, List<ValueDescriptor> fields, TimeConverter timeConverter) {
+        this.contextLookup = new HashMap<>();
+        this.eventType = eventType;
+        this.fields = fields;
+        this.timeConverter = timeConverter;
+    }
+
+    private ObjectContext(ObjectContext parent, ValueDescriptor descriptor) {
+        this.eventType = parent.eventType;
+        this.contextLookup = parent.contextLookup;
+        this.timeConverter = parent.timeConverter;
+        this.fields = descriptor.getFields();
+    }
+
+    public ObjectContext getInstance(ValueDescriptor descriptor) {
+        ObjectContext context = contextLookup.get(descriptor);
+        if (context == null) {
+            context = new ObjectContext(this, descriptor);
+            contextLookup.put(descriptor, context);
+        }
+        return context;
+    }
+}
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