add support for acquireHostListInterval (#280)

* add support for acquireHostListInterval

* change loading defaults

Author: BCaxelbecker

src/main/java/com/arangodb/ArangoDB.java

@@ -263,6 +263,18 @@ public Builder acquireHostList(final Boolean acquireHostList) {
 			setAcquireHostList(acquireHostList);
 			return this;
 		}
+		
+		/**
+		 * Setting the Interval for acquireHostList
+		 *
+		 * @param acquireHostListInterval Interval in Seconds
+		 * 
+		 * @return {@link ArangoDB.Builder}
+		 */
+		public Builder acquireHostListInterval(final Integer acquireHostListInterval) {
+			setAcquireHostListInterval(acquireHostListInterval);
+			return this;
+		}
 
 		/**
 		 * Sets the load balancing strategy to be used in an ArangoDB cluster setup.

src/main/java/com/arangodb/internal/InternalArangoDBBuilder.java

@@ -115,16 +115,22 @@ public InternalArangoDBBuilder() {
 	}
 
 	public InternalArangoDBBuilder loadProperties(final InputStream in) throws ArangoDBException {
+		
+		final Properties properties = new Properties();
+		
 		if (in != null) {
-			final Properties properties = new Properties();
+			
 			try {
 				properties.load(in);
-				loadProperties(properties);
 			} catch (final IOException e) {
 				throw new ArangoDBException(e);
 			}
 		}
+
+		loadProperties(properties);
+
 		return this;
+		
 	}
 
 	protected void loadProperties(final Properties properties) {
@@ -185,6 +191,10 @@ protected void setAcquireHostList(final Boolean acquireHostList) {
 		this.acquireHostList = acquireHostList;
 	}
 
+	protected void setAcquireHostListInterval(final Integer acquireHostListInterval) {
+		this.acquireHostListInterval = acquireHostListInterval;
+	}
+
 	protected void setLoadBalancingStrategy(final LoadBalancingStrategy loadBalancingStrategy) {
 		this.loadBalancingStrategy = loadBalancingStrategy;
 	}