Allowing writeconcern to be set using properties file.

src/main/java/org/log4mongo/MongoDbAppender.java

@@ -29,6 +29,7 @@
 import com.mongodb.Mongo;
 import com.mongodb.MongoException;
 import com.mongodb.ServerAddress;
+import com.mongodb.WriteConcern;
 
 /**
  * Log4J Appender that writes log events into a MongoDB document oriented database. Log events are
@@ -42,7 +43,7 @@
  * @author Peter Monks (pmonks@gmail.com)
  * @see <a href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Appender.html">Log4J
  *      Appender Interface</a>
- * @see <a href="http://www.mongodb.org/">MongoDB</a>
+ * @see <a href="http://www.mongodb.org/">MongoDB</a> 
  */
 public class MongoDbAppender extends BsonAppender {
     private final static String DEFAULT_MONGO_DB_HOSTNAME = "localhost";
@@ -56,7 +57,7 @@ public class MongoDbAppender extends BsonAppender {
     private String collectionName = DEFAULT_MONGO_DB_COLLECTION_NAME;
     private String userName = null;
     private String password = null;
-
+    private WriteConcern writeConcern = WriteConcern.NORMAL;
     private Mongo mongo = null;
     private DBCollection collection = null;
 
@@ -250,6 +251,22 @@ public void setUserName(final String userName) {
     public void setPassword(final String password) {
         this.password = password;
     }
+
+    /**
+     * @return
+     * 				Gets the writeConcern setting for Mongo.
+     */
+    public WriteConcern getWriteConcern() {
+		return writeConcern;
+	}
+
+    /**
+     * @param writeConcern
+     * 				The WriteConcern setting for Mongo Inserts.<i>(may be null). If null, set to default of dbCollection's writeConcern.</i>
+     */
+    public void setWriteConcern(WriteConcern writeConcern) {
+		this.writeConcern = writeConcern;
+	}
 
     /**
      * @param bson
@@ -259,7 +276,7 @@ public void setPassword(final String password) {
     public void append(DBObject bson) {
         if (initialized && bson != null) {
             try {
-                getCollection().insert(bson);
+                getCollection().insert(bson, getWriteConcern());
             } catch (MongoException e) {
                 errorHandler.error("Failed to insert document to MongoDB", e,
                         ErrorCode.WRITE_FAILURE);