Simplify cache and extend cache operations.

Remove the external cache dependency and use a simple LRU based on
LinkedHashMap.
Make it possible to get the parse time of DNSMessage, which means we
can evaluate the TTL later on :-)

1 files changed, 14 insertions, 0 deletions

diff --git a/src/main/java/de/measite/minidns/DNSMessage.java b/src/main/java/de/measite/minidns/DNSMessage.java
index ea1b25c8..977c08d0 100644
--- a/src/main/java/de/measite/minidns/DNSMessage.java
+++ b/src/main/java/de/measite/minidns/DNSMessage.java
@@ -196,6 +196,11 @@ public class DNSMessage {
     protected Record additionalResourceRecords[];
 
     /**
+     * The receive timestamp of this message.
+     */
+    protected long receiveTimestamp;
+
+    /**
      * Retrieve the current DNS message id.
      * @return The current DNS message id.
      */
@@ -212,6 +217,14 @@ public class DNSMessage {
     }
 
     /**
+     * Get the receive timestamp if this message was created via parse.
+     * This should be used to evaluate TTLs.
+     */
+    public long getReceiveTimestamp() {
+        return receiveTimestamp;
+    }
+
+    /**
      * Retrieve the query type (true or false;
      * @return True if this DNS message is a query.
      */
@@ -410,6 +423,7 @@ public class DNSMessage {
         message.authenticData = ((header >> 5) & 1) == 1;
         message.checkDisabled = ((header >> 4) & 1) == 1;
         message.responseCode = RESPONSE_CODE.getResponseCode(header & 0xf);
+	message.receiveTimestamp = System.currentTimeMillis();
         int questionCount = dis.readUnsignedShort();
         int answerCount = dis.readUnsignedShort();
         int nameserverCount = dis.readUnsignedShort();