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;
 }