Merge branch 'raipc-timestamp-performance-incr'

Author: chrjohn

quickfixj-base/src/main/java/quickfix/SystemTime.java

@@ -19,6 +19,8 @@
 
 package quickfix;
 
+import java.time.Clock;
+import java.time.Instant;
 import java.time.LocalDateTime;
 import java.time.ZoneOffset;
 import java.util.Calendar;
@@ -30,20 +32,22 @@
  */
 public class SystemTime {
     public static final TimeZone UTC_TIMEZONE = TimeZone.getTimeZone("UTC");
+    private static final Clock UTC_CLOCK = Clock.systemUTC();
 
-    private static final SystemTimeSource DEFAULT_TIME_SOURCE = new SystemTimeSource() {
+    static final SystemTimeSource UTC = new SystemTimeSource() {
         @Override
         public long getTime() {
             return System.currentTimeMillis();
         }
 
         @Override
         public LocalDateTime getNow() {
-            return LocalDateTime.now(ZoneOffset.UTC);
+            final Instant instant = UTC_CLOCK.instant();
+            return LocalDateTime.ofEpochSecond(instant.getEpochSecond(), instant.getNano(), ZoneOffset.UTC);
         }
     };
 
-    private static volatile SystemTimeSource systemTimeSource = DEFAULT_TIME_SOURCE;
+    private static volatile SystemTimeSource systemTimeSource = UTC;
 
     public static long currentTimeMillis() {
         return systemTimeSource.getTime();
@@ -63,7 +67,7 @@ public static LocalDateTime getLocalDateTime() {
 
     public static void setTimeSource(SystemTimeSource systemTimeSource) {
         SystemTime.systemTimeSource = systemTimeSource != null ? systemTimeSource
-                : DEFAULT_TIME_SOURCE;
+                : UTC;
     }
 
     public static Calendar getUtcCalendar() {

quickfixj-base/src/main/java/quickfix/UtcTimeStampField.java

@@ -27,14 +27,15 @@
  */
 public class UtcTimeStampField extends Field<LocalDateTime> {
 
-    private UtcTimestampPrecision precision = getDefaultUtcTimestampPrecision();
+    private final UtcTimestampPrecision precision;
 
     public UtcTimeStampField(int field) {
-        super(field, LocalDateTime.now(ZoneOffset.UTC));
+        this(field, SystemTime.UTC.getNow());
     }
 
     protected UtcTimeStampField(int field, LocalDateTime data) {
         super(field, data);
+        this.precision = getDefaultUtcTimestampPrecision();
     }
 
     protected UtcTimeStampField(int field, LocalDateTime data, UtcTimestampPrecision precision) {
@@ -43,18 +44,15 @@ protected UtcTimeStampField(int field, LocalDateTime data, UtcTimestampPrecision
     }
 
     public UtcTimeStampField(int field, boolean includeMilliseconds) {
-        super(field, LocalDateTime.now(ZoneOffset.UTC));
-        this.precision = includeMilliseconds ? UtcTimestampPrecision.MILLIS : UtcTimestampPrecision.SECONDS;
+        this(field, includeMilliseconds ? UtcTimestampPrecision.MILLIS : UtcTimestampPrecision.SECONDS);
     }
 
     public UtcTimeStampField(int field, UtcTimestampPrecision precision) {
-        super(field, LocalDateTime.now(ZoneOffset.UTC));
-        this.precision = precision;
+        this(field, SystemTime.UTC.getNow(), precision);
     }
 
     protected UtcTimeStampField(int field, LocalDateTime data, boolean includeMilliseconds) {
-        super(field, data);
-        this.precision = includeMilliseconds ? UtcTimestampPrecision.MILLIS : UtcTimestampPrecision.SECONDS;
+        this(field, data, includeMilliseconds ? UtcTimestampPrecision.MILLIS : UtcTimestampPrecision.SECONDS);
     }
 
     public UtcTimestampPrecision getPrecision() {