Faster shutdown for Peers doing PROOF part of handshake

src/main/java/org/qora/network/Peer.java

@@ -127,6 +127,10 @@ public class Peer extends Thread {
 
 	// Getters / setters
 
+	public boolean isStopping() {
+		return this.isStopping;
+	}
+
 	public PeerData getPeerData() {
 		return this.peerData;
 	}
@@ -500,7 +504,7 @@ public class Peer extends Thread {
 	}
 
 	public void shutdown() {
-		LOGGER.debug(String.format("Shutting down peer %s", this));
+		LOGGER.debug(() -> String.format("Shutting down peer %s", this));
 		this.isStopping = true;
 
 		// Shut down pinger
@@ -525,6 +529,7 @@ public class Peer extends Thread {
 			}
 		}
 
+		LOGGER.debug(() -> String.format("Interrupting peer %s", this));
 		this.interrupt();
 
 		// Close socket, which should trigger run() to exit

src/main/java/org/qora/network/Proof.java

@@ -64,7 +64,7 @@ public class Proof extends Thread {
 		long nonce;
 		for (nonce = 0; nonce < Long.MAX_VALUE; ++nonce) {
 			// Check whether we're shutting down every so often
-			if ((nonce & 0xff) == 0 && Thread.currentThread().isInterrupted())
+			if ((nonce & 0xff) == 0 && (peer.isStopping() || Thread.currentThread().isInterrupted()))
 				// throw new InterruptedException("Interrupted during peer proof calculation");
 				return;