Net traffic compressing. Enabled by default. Can be disabled by -Dnocompress on server.

Mage.Common/src/mage/remote/traffic/ZippedObject.java

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+package mage.remote.traffic;
+
+/**
+ * Base interface for class wrapping non compressed objects.
+ * Provides methods for compressing that should be used before sending it over internet and decompressing to get actual
+ * data.
+ *
+ * @author ayrat
+ */
+public interface ZippedObject<T> {
+
+    void zip(T object);
+
+    T unzip();
+}

Mage.Common/src/mage/remote/traffic/ZippedObjectImpl.java

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+package mage.remote.traffic;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+/**
+ * Implementation for compressing and decompressing objects using {@link GZIPInputStream} and {@link GZIPOutputStream}.
+ * Can be used to send any {@link Object} over internet to reduce traffic usage.
+ *
+ * @author ayrat
+ */
+public class ZippedObjectImpl<T> implements ZippedObject<T>, Serializable {
+
+	private byte[] data;
+
+	public ZippedObjectImpl(T object) {
+		zip(object);
+	}
+	
+	public void zip(T object) {
+		try {
+			ByteArrayOutputStream bos = new ByteArrayOutputStream();
+			GZIPOutputStream gz = new GZIPOutputStream(bos);
+			ObjectOutputStream oos = new ObjectOutputStream(gz);
+			oos.writeObject(object);
+			oos.close();
+			data = bos.toByteArray();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+	
+	@SuppressWarnings("unchecked")
+	public T unzip() {
+		try {
+			ByteArrayInputStream bis = new ByteArrayInputStream(data);
+			GZIPInputStream gz = new GZIPInputStream(bis);
+			ObjectInputStream ois = new ObjectInputStream(gz);
+			Object o = ois.readObject();
+			return (T)o;
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		return null;
+	}
+	
+	private static final long serialVersionUID = 1L;
+}