Add property for protocol

Author: mpv1989

README.md

@@ -138,7 +138,8 @@ The driver is configured with some default values:
 <tr><td>arangodb.password</td><td>Basic Authentication Password</td><td></td></tr>
 <tr><td>arangodb.useSsl</td><td>use SSL connection</td><td>false</td></tr>
 <tr><td>arangodb.chunksize</td><td>VelocyStream Chunk content-size(bytes)</td><td>30000</td></tr>
-<tr><td>arangodb.connections.max</td><td>max number of connections</td><td>1</td></tr>
+<tr><td>arangodb.connections.max</td><td>max number of connections</td><td>1 VST, 20 HTTP</td></tr>
+<tr><td>arangodb.protocol</td><td>used network protocol</td><td>VST</td></tr>
 </table>
 
 To customize the configuration the parameters can be changed in the code...

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

@@ -126,6 +126,7 @@ public Builder loadProperties(final InputStream in) throws ArangoDBException {
 					useSsl = loadUseSsl(properties, useSsl);
 					chunksize = loadChunkSize(properties, chunksize);
 					maxConnections = loadMaxConnections(properties, maxConnections);
+					protocol = loadProtocol(properties, protocol);
 				} catch (final IOException e) {
 					throw new ArangoDBException(e);
 				}

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

@@ -20,6 +20,8 @@
 
 package com.arangodb.internal;
 
+import com.arangodb.Protocol;
+
 /**
  * @author Mark - mark at arangodb.com
  *
@@ -39,6 +41,7 @@ public class ArangoDBConstants {
 	public static final int CHUNK_DEFAULT_CONTENT_SIZE = 30000;
 	public static final int MAX_CONNECTIONS_VST_DEFAULT = 1;
 	public static final int MAX_CONNECTIONS_HTTP_DEFAULT = 20;
+	public static final Protocol DEFAULT_NETWORK_PROTOCOL = Protocol.VST;
 
 	public static final String PATH_API_DOCUMENT = "/_api/document";
 	public static final String PATH_API_COLLECTION = "/_api/collection";

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

@@ -27,6 +27,7 @@
 import java.util.Properties;
 
 import com.arangodb.ArangoDBException;
+import com.arangodb.Protocol;
 import com.arangodb.entity.LogLevelEntity;
 import com.arangodb.entity.ServerRole;
 import com.arangodb.entity.UserEntity;
@@ -62,6 +63,7 @@ public class InternalArangoDB<E extends ArangoExecutor, R, C extends Connection>
 	private static final String PROPERTY_KEY_USE_SSL = "arangodb.usessl";
 	private static final String PROPERTY_KEY_V_STREAM_CHUNK_CONTENT_SIZE = "arangodb.chunksize";
 	private static final String PROPERTY_KEY_MAX_CONNECTIONS = "arangodb.connections.max";
+	private static final String PROPERTY_KEY_PROTOCOL = "arangodb.protocol";
 	protected static final String DEFAULT_PROPERTY_FILE = "/arangodb.properties";
 
 	public InternalArangoDB(final E executor, final ArangoSerialization util) {
@@ -122,6 +124,12 @@ protected static Integer loadMaxConnections(final Properties properties, final I
 			ArangoDBConstants.MAX_CONNECTIONS_VST_DEFAULT));
 	}
 
+	protected static Protocol loadProtocol(final Properties properties, final Protocol currentValue) {
+		return Protocol.valueOf(
+			getProperty(properties, PROPERTY_KEY_PROTOCOL, currentValue, ArangoDBConstants.DEFAULT_NETWORK_PROTOCOL)
+					.toUpperCase());
+	}
+
 	private static <T> String getProperty(
 		final Properties properties,
 		final String key,