fixed resilience tests

Author: rashtao

core/src/main/java/com/arangodb/internal/net/DirtyReadHostHandler.java

@@ -53,9 +53,9 @@ public Host get(final HostHandle hostHandle, final AccessType accessType) {
     }
 
     @Override
-    public boolean hasNext(HostHandle hostHandle, AccessType accessType) {
+    public void checkNext(HostHandle hostHandle, AccessType accessType) {
         this.currentAccessType = accessType;
-        return determineHostHandler().hasNext(hostHandle, accessType);
+        determineHostHandler().checkNext(hostHandle, accessType);
     }
 
     @Override

core/src/main/java/com/arangodb/internal/net/FallbackHostHandler.java

@@ -49,21 +49,20 @@ public FallbackHostHandler(final HostResolver resolver) {
 
     @Override
     public Host get(final HostHandle hostHandle, AccessType accessType) {
-        if (hasNext(hostHandle, accessType)) {
-            return current;
-        } else {
+        checkNext(hostHandle, accessType);
+        return current;
+    }
+
+    @Override
+    public void checkNext(HostHandle hostHandle, AccessType accessType) {
+        if (current == lastSuccess && iterations >= 3) {
             ArangoDBException e = ArangoDBException.of("Cannot contact any host!",
                     new ArangoDBMultipleException(new ArrayList<>(lastFailExceptions)));
             reset();
             throw e;
         }
     }
 
-    @Override
-    public boolean hasNext(HostHandle hostHandle, AccessType accessType) {
-        return current != lastSuccess || iterations < 3;
-    }
-
     @Override
     public void success() {
         lastSuccess = current;

core/src/main/java/com/arangodb/internal/net/HostHandler.java

@@ -31,7 +31,7 @@ public interface HostHandler {
 
     Host get(HostHandle hostHandle, AccessType accessType);
 
-    boolean hasNext(HostHandle hostHandle, AccessType accessType);
+    void checkNext(HostHandle hostHandle, AccessType accessType);
 
     void success();
 

core/src/main/java/com/arangodb/internal/net/RandomHostHandler.java

@@ -53,8 +53,7 @@ public Host get(final HostHandle hostHandle, AccessType accessType) {
     }
 
     @Override
-    public boolean hasNext(HostHandle hostHandle, AccessType accessType) {
-        return true;
+    public void checkNext(HostHandle hostHandle, AccessType accessType) {
     }
 
     @Override

core/src/main/java/com/arangodb/internal/net/RoundRobinHostHandler.java

@@ -53,16 +53,8 @@ public RoundRobinHostHandler(final HostResolver resolver) {
 
     @Override
     public Host get(final HostHandle hostHandle, AccessType accessType) {
-        hosts = resolver.getHosts();
+        checkNext(hostHandle, accessType);
         final int size = hosts.getHostsList().size();
-
-        if (fails > size) {
-            ArangoDBException e = ArangoDBException.of("Cannot contact any host!",
-                    new ArangoDBMultipleException(new ArrayList<>(lastFailExceptions)));
-            reset();
-            throw e;
-        }
-
         final int index = (int) ((current++) % size);
         Host host = hosts.getHostsList().get(index);
         if (hostHandle != null) {
@@ -83,10 +75,16 @@ public Host get(final HostHandle hostHandle, AccessType accessType) {
     }
 
     @Override
-    public boolean hasNext(HostHandle hostHandle, AccessType accessType) {
+    public void checkNext(HostHandle hostHandle, AccessType accessType) {
         hosts = resolver.getHosts();
-        int size = hosts.getHostsList().size();
-        return  fails <= size;
+        final int size = hosts.getHostsList().size();
+
+        if (fails > size) {
+            ArangoDBException e = ArangoDBException.of("Cannot contact any host!",
+                    new ArangoDBMultipleException(new ArrayList<>(lastFailExceptions)));
+            reset();
+            throw e;
+        }
     }
 
     @Override

http/src/main/java/com/arangodb/http/HttpCommunication.java

@@ -134,8 +134,8 @@ private void handleException(boolean isSafe, Throwable e, HostHandle hostHandle,
         if (hostHandle != null && hostHandle.getHost() != null) {
             hostHandle.setHost(null);
         }
-        boolean hasNextHost = hostHandler.hasNext(hostHandle, RequestUtils.determineAccessType(request));
-        if (hasNextHost && isSafe) {
+        hostHandler.checkNext(hostHandle, RequestUtils.determineAccessType(request));
+        if (isSafe) {
             Host nextHost = hostHandler.get(hostHandle, RequestUtils.determineAccessType(request));
             LOGGER.warn("Could not connect to {} while executing request [id={}]",
                     host.getDescription(), reqId, ioEx);