Bump NIO buffers to 32 K

And change EOF message, to make it clearer.

Fixes #11

Author: acogoluegnes

src/main/java/com/rabbitmq/client/impl/nio/NioHelper.java

@@ -25,7 +25,7 @@ public class NioHelper {
     static int read(ReadableByteChannel channel, ByteBuffer buffer) throws IOException {
         int read = channel.read(buffer);
         if(read < 0) {
-            throw new IOException("Channel has reached EOF");
+            throw new IOException("I/O thread: reached EOF");
         }
         return read;
     }

src/main/java/com/rabbitmq/client/impl/nio/NioParams.java

@@ -28,10 +28,10 @@
 public class NioParams {
 
     /** size of the byte buffer used for inbound data */
-    private int readByteBufferSize = 8192;
+    private int readByteBufferSize = 32768;
 
     /** size of the byte buffer used for outbound data */
-    private int writeByteBufferSize = 8192;
+    private int writeByteBufferSize = 32768;
 
     /** the max number of IO threads */
     private int nbIoThreads = 1;
@@ -70,7 +70,7 @@ public int getReadByteBufferSize() {
 
     /**
      * Sets the size in byte of the read {@link java.nio.ByteBuffer} used in the NIO loop.
-     * Default is 8192.
+     * Default is 32768.
      *
      * This parameter isn't used when using SSL/TLS, where {@link java.nio.ByteBuffer}
      * size is set up according to the {@link javax.net.ssl.SSLSession} packet size.
@@ -92,7 +92,7 @@ public int getWriteByteBufferSize() {
 
     /**
      * Sets the size in byte of the write {@link java.nio.ByteBuffer} used in the NIO loop.
-     * Default is 8192.
+     * Default is 32768.
      *
      * This parameter isn't used when using SSL/TLS, where {@link java.nio.ByteBuffer}
      * size is set up according to the {@link javax.net.ssl.SSLSession} packet size.