--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/jdk/internal/event/EventHelper.java	Tue Nov 20 13:12:48 2018 +0000
@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2018, 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.internal.event;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Date;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+/**
+ * A helper class to have events logged to a JDK Event Logger.
+ */
+
+public final class EventHelper {
+
+    private static final System.Logger.Level LOG_LEVEL = System.Logger.Level.DEBUG;
+
+    // helper class used for logging security related events for now
+    private static final String SECURITY_LOGGER_NAME = "jdk.event.security";
+    private static final System.Logger SECURITY_LOGGER =
+            System.getLogger(SECURITY_LOGGER_NAME);
+    private static final boolean LOGGING_SECURITY =
+            SECURITY_LOGGER.isLoggable(LOG_LEVEL);
+
+    public static void logTLSHandshakeEvent(Instant start,
+                                            String peerHost,
+                                            int peerPort,
+                                            String cipherSuite,
+                                            String protocolVersion,
+                                            long peerCertId) {
+        String prepend = getDurationString(start);
+        SECURITY_LOGGER.log(LOG_LEVEL, prepend +
+        " TLSHandshake: {0}:{1,number,#}, {2}, {3}, {4,number,#}",
+        peerHost, peerPort, protocolVersion, cipherSuite, peerCertId);
+    }
+
+    public static void logSecurityPropertyEvent(String key,
+                                                String value) {
+
+        if (isLoggingSecurity()) {
+            SECURITY_LOGGER.log(LOG_LEVEL,
+                "SecurityPropertyModification: key:{0}, value:{1}", key, value);
+        }
+    }
+
+    public static void logX509ValidationEvent(int anchorCertId,
+                                         int[] certIds) {
+        String codes = IntStream.of(certIds)
+                .mapToObj(Integer::toString)
+                .collect(Collectors.joining(", "));
+        SECURITY_LOGGER.log(LOG_LEVEL,
+                "ValidationChain: {0,number,#}, {1}", anchorCertId, codes);
+    }
+
+    public static void logX509CertificateEvent(String algId,
+                                               String serialNum,
+                                               String subject,
+                                               String issuer,
+                                               String keyType,
+                                               int length,
+                                               long certId,
+                                               long beginDate,
+                                               long endDate) {
+        SECURITY_LOGGER.log(LOG_LEVEL, "X509Certificate: Alg:{0}, Serial:{1}" +
+            ", Subject:{2}, Issuer:{3}, Key type:{4}, Length:{5,number,#}" +
+            ", Cert Id:{6,number,#}, Valid from:{7}, Valid until:{8}",
+            algId, serialNum, subject, issuer, keyType, length,
+            certId, new Date(beginDate), new Date(endDate));
+    }
+
+    /**
+     * Method to calculate a duration timestamp for events which measure
+     * the start and end times of certain operations.
+     * @param start Instant indicating when event started recording
+     * @return A string representing duraction from start time to
+     * time of this method call. Empty string is start is null.
+     */
+    private static String getDurationString(Instant start) {
+        if (start != null) {
+            Duration duration = Duration.between(start, Instant.now());
+            long micros = duration.toNanos() / 1_000;
+            if (micros < 1_000_000) {
+                return "duration = " + (micros / 1_000.0) + " ms:";
+            } else {
+                return "duration = " + ((micros / 1_000) / 1_000.0) + " s:";
+            }
+        } else {
+            return "";
+        }
+    }
+
+    /**
+     * Helper to determine if security events are being logged
+     * at a preconfigured logging level. The configuration value
+     * is read once at class initialization.
+     *
+     * @return boolean indicating whether an event should be logged
+     */
+    public static boolean isLoggingSecurity() {
+        return LOGGING_SECURITY;
+    }
+}