!1 缓存空间大小从配置中取

* 缓存空间大小从配置中取

src/main/java/cn/org/hentai/dns/stat/StatManager.java

@@ -1,6 +1,7 @@
 package cn.org.hentai.dns.stat;
 
 import cn.org.hentai.dns.util.Configs;
+import cn.org.hentai.dns.util.Conversion;
 import cn.org.hentai.dns.util.Packet;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -33,7 +34,9 @@ public final class StatManager
 
     private StatManager()
     {
-        logs = Packet.create(1024 * 1024 * 200);
+        String lmem = Configs.get("dns.stat-logger.memory");
+        int i = Conversion.toByte(lmem);
+        logs = Packet.create(i);
         domainNameMap = new HashMap();
         sequence = 1;
 

src/main/java/cn/org/hentai/dns/util/Conversion.java

@@ -0,0 +1,35 @@
+package cn.org.hentai.dns.util;
+
+/**
+ * Created by huangzhian on 2019/10/21.
+ */
+public class Conversion {
+
+    /**
+     * 将配置的缓存空间单位KMG转换为byte,
+     * 因为int类型的限制，将最大缓存空间设为1G
+     */
+    public static int toByte(String memory) {
+        int count = 0;
+        String mem;
+        if (memory == null) {
+            return 0;
+        }
+        mem = memory.toUpperCase();
+        if (mem.matches("[0-9]+[KMG]{1}")) {
+            String submem = memory.substring(0, memory.length() - 1);
+            count = Integer.parseInt(submem);
+        } else if (mem.matches("[0-9]+")) {
+            count = Integer.parseInt(memory);
+        }
+        if (mem.endsWith("M")) {
+            return (count > 1024 ? 1024 : count) << 20;
+        } else if (mem.endsWith("G")) {
+            return (count > 1 ? 1 : count) << 30;
+        } else if (mem.endsWith("K")) {
+            return count << 10;
+        } else {
+            return count;
+        }
+    }
+}