use Executor services for thread pooling/management; some tidy up

src/main/java/io/github/chronosx88/JGUN/Dispatcher.java

@@ -12,6 +12,8 @@ import org.json.JSONObject;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 
 public class Dispatcher {
     private final Map<String, BaseCompletableFuture<?>> pendingFutures = new ConcurrentHashMap<>();
@@ -20,6 +22,7 @@ public class Dispatcher {
     private final Peer peer;
     private final StorageBackend graphStorage;
     private final Dup dup;
+    private final Executor executorService = Executors.newCachedThreadPool();
 
     public Dispatcher(StorageBackend graphStorage, Peer peer, Dup dup) {
         this.graphStorage = graphStorage;
@@ -83,17 +86,17 @@ public class Dispatcher {
     }
 
     public void sendPutRequest(String messageID, JSONObject data) {
-        new Thread(() -> {
+        executorService.execute(() -> {
             InMemoryGraph graph = Utils.prepareDataForPut(data);
             peer.emit(Utils.formatPutRequest(messageID, graph.toJSONObject()).toString());
-        }).start();
+        });
     }
 
     public void sendGetRequest(String messageID, String key, String field) {
-        new Thread(() -> {
+        executorService.execute(() -> {
             JSONObject jsonGet = Utils.formatGetRequest(messageID, key, field);
             peer.emit(jsonGet.toString());
-        }).start();
+        });
     }
 
     public void addChangeListener(String soul, NodeChangeListener listener) {

src/main/java/io/github/chronosx88/JGUN/Dup.java

@@ -1,13 +1,11 @@
 package io.github.chronosx88.JGUN;
 
 import java.util.Map;
-import java.util.Random;
 import java.util.UUID;
 import java.util.concurrent.ConcurrentHashMap;
 
 public class Dup {
     private static char[] randomSeed = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
-    private static Random random = new Random(System.currentTimeMillis());
     private Map<String, Long> s = new ConcurrentHashMap<>();
     private DupOpt opt = new DupOpt();
     private Thread to = null;

src/main/java/io/github/chronosx88/JGUN/examples/MainClientServer.java

@@ -9,12 +9,14 @@ import org.json.JSONObject;
 
 import java.net.Inet4Address;
 import java.net.UnknownHostException;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 
 public class MainClientServer {
     public static void main(String[] args) {
         GunSuperPeer gunSuperNode = new GunSuperPeer(21334, new InMemoryGraph());
         gunSuperNode.start();
-        new Thread(() -> {
+        Runnable task = () -> {
             Gun gun = null;
             try {
                 gun = new Gun(Inet4Address.getByAddress(new byte[]{127, 0, 0, 1}), 21334, new InMemoryGraph());
@@ -45,7 +47,9 @@ public class MainClientServer {
             System.out.println("Deleting an item random/dVFtzE9CL");
             gun.get("random").get("dVFtzE9CL").put(null).await();
             gun.get("random").put(new JSONObject().put("hello", "world")).await();
-        }).start();
+        };
 
+        Executor executorService = Executors.newSingleThreadExecutor();
+        executorService.execute(task);
     }
 }

src/main/java/io/github/chronosx88/JGUN/futures/BaseCompletableFuture.java

@@ -1,9 +1,9 @@
 package io.github.chronosx88.JGUN.futures;
 
-import java9.util.concurrent.CompletableFuture;
-
 import java.util.concurrent.ExecutionException;
 
+import java9.util.concurrent.CompletableFuture;
+
 
 public class BaseCompletableFuture<T> extends CompletableFuture<T> {
     private final String futureID;

src/main/java/io/github/chronosx88/JGUN/nodes/GunClient.java

@@ -2,8 +2,8 @@ package io.github.chronosx88.JGUN.nodes;
 
 import io.github.chronosx88.JGUN.Dispatcher;
 import io.github.chronosx88.JGUN.Dup;
-import io.github.chronosx88.JGUN.PathRef;
 import io.github.chronosx88.JGUN.storageBackends.StorageBackend;
+
 import org.java_websocket.client.WebSocketClient;
 import org.java_websocket.handshake.ServerHandshake;
 import org.json.JSONObject;
@@ -14,12 +14,10 @@ import java.net.URISyntaxException;
 
 public class GunClient extends WebSocketClient implements Peer {
     private Dup dup = new Dup();
-    private final StorageBackend storage;
     private final Dispatcher dispatcher;
 
     public GunClient(InetAddress address, int port, StorageBackend storage) throws URISyntaxException {
         super(new URI("ws://" + address.getHostAddress() + ":" + port));
-        this.storage = storage;
         this.dispatcher = new Dispatcher(storage, this, dup);
     }
 

src/main/java/io/github/chronosx88/JGUN/nodes/GunSuperPeer.java

@@ -3,6 +3,7 @@ package io.github.chronosx88.JGUN.nodes;
 import io.github.chronosx88.JGUN.Dispatcher;
 import io.github.chronosx88.JGUN.Dup;
 import io.github.chronosx88.JGUN.storageBackends.StorageBackend;
+
 import org.java_websocket.WebSocket;
 import org.java_websocket.handshake.ClientHandshake;
 import org.java_websocket.server.WebSocketServer;
@@ -12,14 +13,12 @@ import java.net.InetSocketAddress;
 
 public class GunSuperPeer extends WebSocketServer implements Peer {
     private Dup dup = new Dup();
-    private StorageBackend graph;
     private Dispatcher dispatcher;
 
     public GunSuperPeer(int port, StorageBackend storageBackend) {
         super(new InetSocketAddress(port));
         setReuseAddr(true);
         dispatcher = new Dispatcher(storageBackend, this, dup);
-        this.graph = storageBackend;
     }
 
     @Override

src/main/java/io/github/chronosx88/JGUN/storageBackends/InMemoryGraph.java

@@ -1,9 +1,14 @@
 package io.github.chronosx88.JGUN.storageBackends;
 
 import io.github.chronosx88.JGUN.Node;
+
 import org.json.JSONObject;
 
-import java.util.*;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Set;
 
 public class InMemoryGraph implements StorageBackend {