From 0cbdc4ecb927b7ab068e5833caefbba65c9aa87a Mon Sep 17 00:00:00 2001
From: Alexander Alexeev
Date: Sat, 10 Dec 2016 21:00:14 +0700
Subject: caching date formatter

---
 .../main/java/com/juick/util/DateFormatter.java    |  2 +-
 .../www/configuration/WwwServletConfiguration.java |  6 +--
 .../com/juick/www/formatter/DateFormatter.java     | 43 ---------------------
 .../juick/www/formatter/SpringDateFormatter.java   | 45 ++++++++++++++++++++++
 4 files changed, 49 insertions(+), 47 deletions(-)
 delete mode 100644 juick-spring-www/src/main/java/com/juick/www/formatter/DateFormatter.java
 create mode 100644 juick-spring-www/src/main/java/com/juick/www/formatter/SpringDateFormatter.java

diff --git a/juick-core/src/main/java/com/juick/util/DateFormatter.java b/juick-core/src/main/java/com/juick/util/DateFormatter.java
index 34585c63..c4e7095b 100644
--- a/juick-core/src/main/java/com/juick/util/DateFormatter.java
+++ b/juick-core/src/main/java/com/juick/util/DateFormatter.java
@@ -13,7 +13,7 @@ import java.util.Date;
 public class DateFormatter {
     private final DateTimeFormatter formatter;
 
-    DateFormatter(String pattern) {
+    public DateFormatter(String pattern) {
         formatter = DateTimeFormatter.ofPattern(pattern);
     }
 
diff --git a/juick-spring-www/src/main/java/com/juick/www/configuration/WwwServletConfiguration.java b/juick-spring-www/src/main/java/com/juick/www/configuration/WwwServletConfiguration.java
index 9a2bb1d4..2eb39e1c 100644
--- a/juick-spring-www/src/main/java/com/juick/www/configuration/WwwServletConfiguration.java
+++ b/juick-spring-www/src/main/java/com/juick/www/configuration/WwwServletConfiguration.java
@@ -2,7 +2,7 @@ package com.juick.www.configuration;
 
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.datatype.jdk8.Jdk8Module;
-import com.juick.www.formatter.DateFormatter;
+import com.juick.www.formatter.SpringDateFormatter;
 import nz.net.ultraq.thymeleaf.LayoutDialect;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
@@ -122,7 +122,7 @@ public class WwwServletConfiguration extends WebMvcConfigurationSupport {
     }
 
     @Bean
-    public DateFormatter dateFormatter() {
-        return new DateFormatter();
+    public SpringDateFormatter dateFormatter() {
+        return new SpringDateFormatter();
     }
 }
diff --git a/juick-spring-www/src/main/java/com/juick/www/formatter/DateFormatter.java b/juick-spring-www/src/main/java/com/juick/www/formatter/DateFormatter.java
deleted file mode 100644
index 74596fc5..00000000
--- a/juick-spring-www/src/main/java/com/juick/www/formatter/DateFormatter.java
+++ /dev/null
@@ -1,43 +0,0 @@
-package com.juick.www.formatter;
-
-import org.springframework.context.MessageSource;
-import org.springframework.format.Formatter;
-
-import javax.annotation.Resource;
-import java.text.ParseException;
-import java.text.SimpleDateFormat;
-import java.util.Date;
-import java.util.Locale;
-
-/**
- * Created by aalexeev on 11/22/16.
- */
-public class DateFormatter implements Formatter<Date> {
-    @Resource
-    private MessageSource messageSource;
-
-
-    public DateFormatter() {
-        super();
-    }
-
-    @Override
-    public Date parse(final String text, final Locale locale) throws ParseException {
-        final SimpleDateFormat dateFormat = createDateFormat(locale);
-        return dateFormat.parse(text);
-    }
-
-    @Override
-    public String print(final Date object, final Locale locale) {
-        final SimpleDateFormat dateFormat = createDateFormat(locale);
-        return dateFormat.format(object);
-    }
-
-    private SimpleDateFormat createDateFormat(final Locale locale) {
-        final String format = this.messageSource.getMessage("date.format", null, locale);
-        final SimpleDateFormat dateFormat = new SimpleDateFormat(format);
-        dateFormat.setLenient(false);
-        return dateFormat;
-    }
-
-}
diff --git a/juick-spring-www/src/main/java/com/juick/www/formatter/SpringDateFormatter.java b/juick-spring-www/src/main/java/com/juick/www/formatter/SpringDateFormatter.java
new file mode 100644
index 00000000..61a2fe88
--- /dev/null
+++ b/juick-spring-www/src/main/java/com/juick/www/formatter/SpringDateFormatter.java
@@ -0,0 +1,45 @@
+package com.juick.www.formatter;
+
+import com.juick.util.DateFormatter;
+import org.springframework.context.MessageSource;
+import org.springframework.format.Formatter;
+
+import javax.annotation.Resource;
+import java.text.ParseException;
+import java.util.Date;
+import java.util.Locale;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+/**
+ * Created by aalexeev on 11/22/16.
+ */
+public class SpringDateFormatter implements Formatter<Date> {
+    @Resource
+    private MessageSource messageSource;
+    private ConcurrentMap<Locale, com.juick.util.DateFormatter> formattersMap =
+            new ConcurrentHashMap<>(4, 0.75f, 2); // MAX 4 languages and 4/2=2 threads for write
+
+
+    @Override
+    public Date parse(final String text, final Locale locale) throws ParseException {
+        DateFormatter formatter = formattersMap.getOrDefault(
+                locale, createFormatter(locale));
+
+        return formatter.parse(text);
+    }
+
+    @Override
+    public String print(final Date object, final Locale locale) {
+        DateFormatter formatter = formattersMap.getOrDefault(
+                locale, createFormatter(locale));
+        return formatter.format(object);
+    }
+
+    private DateFormatter createFormatter(final Locale locale) {
+        String pattern = messageSource.getMessage("date.format", null, locale);
+
+        return new DateFormatter(pattern);
+    }
+
+}
-- 
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