Implement Closeable where relevant

This helps to advertise closeability of resource.

Author: ash2k

api/src/main/java/com/ning/http/client/AsyncHttpProvider.java

@@ -15,14 +15,15 @@
  */
 package com.ning.http.client;
 
+import java.io.Closeable;
 import java.io.IOException;
 import java.util.List;
 
 /**
  * Interface to be used when implementing custom asynchronous I/O HTTP client.
  * By default, the {@link com.ning.http.client.providers.netty.NettyAsyncHttpProvider} is used.
  */
-public interface AsyncHttpProvider {
+public interface AsyncHttpProvider extends Closeable {
 
     /**
      * Execute the request and invoke the {@link AsyncHandler} when the response arrive.

api/src/main/java/com/ning/http/client/Body.java

@@ -13,13 +13,14 @@
 
 package com.ning.http.client;
 
+import java.io.Closeable;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 
 /**
  * A request body.
  */
-public interface Body {
+public interface Body extends Closeable {
 
     /**
      * Gets the length of the body.

api/src/main/java/com/ning/http/client/BodyConsumer.java

@@ -13,13 +13,14 @@
 
 package com.ning.http.client;
 
+import java.io.Closeable;
 import java.io.IOException;
 import java.nio.ByteBuffer;
 
 /**
  * A simple API to be used with the {@link SimpleAsyncHttpClient} class in order to process response's bytes.
  */
-public interface BodyConsumer {
+public interface BodyConsumer extends Closeable {
 
     /**
      * Consume the received bytes.

api/src/main/java/com/ning/http/client/SimpleAsyncHttpClient.java

@@ -20,6 +20,8 @@
 import org.slf4j.LoggerFactory;
 
 import javax.net.ssl.SSLContext;
+
+import java.io.Closeable;
 import java.io.IOException;
 import java.util.Collection;
 import java.util.Map;
@@ -57,7 +59,7 @@
  * Future<Response> future = client.post(new FileodyGenerator(myFile), new OutputStreamBodyConsumer(o));
  * </pre></blockquote>
  */
-public class SimpleAsyncHttpClient {
+public class SimpleAsyncHttpClient implements Closeable {
 
     private final static Logger logger = LoggerFactory.getLogger(SimpleAsyncHttpClient.class);
     private final AsyncHttpClientConfig config;