--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/ParserFilter.java	Wed Oct 30 19:43:52 2019 +0100
@@ -0,0 +1,80 @@
+/*
+ * 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.Map;
+import java.util.StringJoiner;
+
+final class ParserFilter {
+    public static final ParserFilter ACCEPT_ALL = new ParserFilter(true, Map.of());
+
+    private final Map<String, Long> thresholds;
+    private final boolean acceptAll;
+
+    public ParserFilter() {
+        this(false, new HashMap<>());
+    }
+
+    private ParserFilter(boolean acceptAll, Map<String, Long> thresholds) {
+        this.acceptAll = acceptAll;
+        this.thresholds = thresholds;
+    }
+
+    public void setThreshold(String eventName, long nanos) {
+        Long l = thresholds.get(eventName);
+        if (l != null) {
+            l = Math.min(l, nanos);
+        } else {
+            l = nanos;
+        }
+        thresholds.put(eventName, l);
+    }
+
+    public long getThreshold(String eventName) {
+        if (acceptAll) {
+            return 0L;
+        }
+        Long l = thresholds.get(eventName);
+        if (l != null) {
+            return l;
+        }
+        return -1;
+    }
+
+    public String toString() {
+        if (acceptAll) {
+            return "ACCEPT ALL";
+        }
+
+        StringJoiner sb = new StringJoiner(", ");
+        for (String key : thresholds.keySet().toArray(new String[0])) {
+            Long value = thresholds.get(key);
+            sb.add(key + " = " + value);
+        }
+        return sb.toString();
+    }
+}