changes LoadbalanceStrategy to accept List

Signed-off-by: Oleh Dokuka <[email protected]>

Author: OlegDokuka

rsocket-core/src/main/java/io/rsocket/loadbalance/LoadbalanceStrategy.java

@@ -15,12 +15,13 @@
  */
 package io.rsocket.loadbalance;
 
+import java.util.List;
 import java.util.function.Supplier;
 
 @FunctionalInterface
 public interface LoadbalanceStrategy {
 
-  PooledRSocket select(PooledRSocket[] availableRSockets);
+  PooledRSocket select(List<PooledRSocket> availableRSockets);
 
   default Supplier<Stats> statsSupplier() {
     return Stats::noOps;

rsocket-core/src/main/java/io/rsocket/loadbalance/RSocketPool.java

@@ -20,8 +20,11 @@
 import io.rsocket.RSocket;
 import io.rsocket.frame.FrameType;
 import java.util.Arrays;
+import java.util.Collection;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
+import java.util.ListIterator;
 import java.util.concurrent.CancellationException;
 import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
 import java.util.function.Supplier;
@@ -34,7 +37,7 @@
 import reactor.util.annotation.Nullable;
 
 class RSocketPool extends ResolvingOperator<Void>
-    implements CoreSubscriber<List<LoadbalanceRSocketSource>> {
+    implements CoreSubscriber<List<LoadbalanceRSocketSource>>, List<PooledRSocket> {
 
   final DeferredResolutionRSocket deferredResolutionRSocket = new DeferredResolutionRSocket(this);
   final LoadbalanceStrategy loadbalanceStrategy;
@@ -200,7 +203,33 @@ RSocket doSelect() {
       return null;
     }
 
-    return this.loadbalanceStrategy.select(sockets);
+    return this.loadbalanceStrategy.select(this);
+  }
+
+  @Override
+  public PooledRSocket get(int index) {
+    return activeSockets[index];
+  }
+
+  @Override
+  public int size() {
+    return activeSockets.length;
+  }
+
+  @Override
+  public boolean isEmpty() {
+    return activeSockets.length == 0;
+  }
+
+  @Override
+  public Object[] toArray() {
+    return activeSockets;
+  }
+
+  @Override
+  @SuppressWarnings("unchecked")
+  public <T> T[] toArray(T[] a) {
+    return (T[]) activeSockets;
   }
 
   static class DeferredResolutionRSocket implements RSocket {
@@ -325,4 +354,94 @@ public void accept(Void aVoid, Throwable t) {
       }
     }
   }
+
+  @Override
+  public boolean contains(Object o) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public Iterator<PooledRSocket> iterator() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean add(PooledRSocket pooledRSocket) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean remove(Object o) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean containsAll(Collection<?> c) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean addAll(Collection<? extends PooledRSocket> c) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean addAll(int index, Collection<? extends PooledRSocket> c) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean removeAll(Collection<?> c) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public boolean retainAll(Collection<?> c) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void clear() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public PooledRSocket set(int index, PooledRSocket element) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public void add(int index, PooledRSocket element) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public PooledRSocket remove(int index) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public int indexOf(Object o) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public int lastIndexOf(Object o) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public ListIterator<PooledRSocket> listIterator() {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public ListIterator<PooledRSocket> listIterator(int index) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public List<PooledRSocket> subList(int fromIndex, int toIndex) {
+    throw new UnsupportedOperationException();
+  }
 }

rsocket-core/src/main/java/io/rsocket/loadbalance/RoundRobinLoadbalanceStrategy.java

@@ -15,6 +15,7 @@
  */
 package io.rsocket.loadbalance;
 
+import java.util.List;
 import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
 
 public class RoundRobinLoadbalanceStrategy implements LoadbalanceStrategy {
@@ -25,12 +26,11 @@ public class RoundRobinLoadbalanceStrategy implements LoadbalanceStrategy {
       AtomicIntegerFieldUpdater.newUpdater(RoundRobinLoadbalanceStrategy.class, "nextIndex");
 
   @Override
-  public PooledRSocket select(PooledRSocket[] sockets) {
-    int length = sockets.length;
+  public PooledRSocket select(List<PooledRSocket> sockets) {
+    int length = sockets.size();
 
     int indexToUse = Math.abs(NEXT_INDEX.getAndIncrement(this) % length);
 
-    final PooledRSocket pooledRSocket = sockets[indexToUse];
-    return pooledRSocket;
+    return sockets.get(indexToUse);
   }
 }

rsocket-core/src/main/java/io/rsocket/loadbalance/WeightedLoadbalanceStrategy.java

@@ -16,6 +16,7 @@
 
 package io.rsocket.loadbalance;
 
+import java.util.List;
 import java.util.SplittableRandom;
 import java.util.concurrent.ThreadLocalRandom;
 import java.util.function.Supplier;
@@ -56,19 +57,19 @@ public Supplier<Stats> statsSupplier() {
   }
 
   @Override
-  public PooledRSocket select(PooledRSocket[] sockets) {
+  public PooledRSocket select(List<PooledRSocket> sockets) {
     final int effort = this.effort;
-    final int size = sockets.length;
+    final int size = sockets.size();
 
     PooledRSocket pooledRSocket;
     switch (size) {
       case 1:
-        pooledRSocket = sockets[0];
+        pooledRSocket = sockets.get(0);
         break;
       case 2:
         {
-          PooledRSocket rsc1 = sockets[0];
-          PooledRSocket rsc2 = sockets[1];
+          PooledRSocket rsc1 = sockets.get(0);
+          PooledRSocket rsc2 = sockets.get(1);
 
           double w1 = algorithmicWeight(rsc1);
           double w2 = algorithmicWeight(rsc2);
@@ -91,8 +92,8 @@ public PooledRSocket select(PooledRSocket[] sockets) {
             if (i2 >= i1) {
               i2++;
             }
-            rsc1 = sockets[i1];
-            rsc2 = sockets[i2];
+            rsc1 = sockets.get(i1);
+            rsc2 = sockets.get(i2);
             if (rsc1.availability() > 0.0 && rsc2.availability() > 0.0) {
               break;
             }