move replica2 to top level

1 files changed, 50 insertions, 0 deletions

diff --git a/src/main/java/derms/replica2/ResourceTransfer.java b/src/main/java/derms/replica2/ResourceTransfer.java
new file mode 100644
index 0000000..0ed17c5
--- /dev/null
+++ b/src/main/java/derms/replica2/ResourceTransfer.java
@@ -0,0 +1,50 @@
+package derms.replica2;
+
+import java.io.IOException;
+import java.io.Serializable;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.SocketAddress;
+import java.util.ArrayList;
+import java.util.List;
+
+class ResourceTransfer {
+	static final int bufsize = 1024;
+
+	static void send(Resource[] resources, SocketAddress remoteAddr) throws IOException {
+		DatagramSocket sock = new DatagramSocket();
+
+		for (Resource resource : resources) {
+			DatagramPacket pkt = ObjectPacket.create(resource, remoteAddr);
+			sock.send(pkt);
+		}
+
+		DatagramPacket pkt = ObjectPacket.create(new EndOfTransmission(), remoteAddr);
+		sock.send(pkt);
+		sock.close();
+	}
+
+	static Resource[] receive(DatagramSocket sock) throws IOException {
+		List<Resource> resources = new ArrayList<Resource>();
+		byte[] buf = new byte[bufsize];
+		DatagramPacket response = new DatagramPacket(buf, buf.length);
+
+		for (;;) {
+			sock.receive(response);
+
+			Object obj = ObjectPacket.deserialize(response, Object.class);
+			if (obj.getClass() == EndOfTransmission.class) {
+				break;
+			}
+			try {
+				resources.add((Resource) obj);
+			} catch (Exception e) {
+				throw new IOException("expected Resource; got "+obj.getClass().toString());
+			}
+		}
+		Resource[] arr = new Resource[0];
+		return resources.toArray(arr);
+	}
+
+	private static class EndOfTransmission implements Serializable {}
+}
\ No newline at end of file