Replace Resolver implementations with library solution (#354)

Removes old Resolver implementations.
Removes Resolver "hooks" that were added in core code.
Adds org.burningwave:tools dependency as the preferred solution.
Adds MultimapHostResolver implementation allowing for one-to-many mapping of
hostnames to ips.
Adds MultimapHostResolverProvider as a replacement for ResolverProvider.
Adjusts MockResolverIT to use new replacement.

Author: Bouncheck

Diff for: core/src/main/java/com/datastax/oss/driver/internal/core/ContactPoints.java

@@ -19,8 +19,6 @@
 
 import com.datastax.oss.driver.api.core.metadata.EndPoint;
 import com.datastax.oss.driver.internal.core.metadata.DefaultEndPoint;
-import com.datastax.oss.driver.internal.core.resolver.Resolver;
-import com.datastax.oss.driver.internal.core.resolver.ResolverProvider;
 import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableSet;
 import com.datastax.oss.driver.shaded.guava.common.collect.Sets;
 import java.net.InetAddress;
@@ -37,7 +35,6 @@
 /** Utility class to handle the initial contact points passed to the driver. */
 public class ContactPoints {
   private static final Logger LOG = LoggerFactory.getLogger(ContactPoints.class);
-  private static Resolver RESOLVER = ResolverProvider.getResolver(ContactPoints.class);
 
   public static Set<EndPoint> merge(
       Set<EndPoint> programmaticContactPoints, List<String> configContactPoints, boolean resolve) {
@@ -75,7 +72,7 @@ private static Set<InetSocketAddress> extract(String spec, boolean resolve) {
       return ImmutableSet.of(InetSocketAddress.createUnresolved(host, port));
     } else {
       try {
-        InetAddress[] inetAddresses = RESOLVER.getAllByName(host);
+        InetAddress[] inetAddresses = InetAddress.getAllByName(host);
         if (inetAddresses.length > 1) {
           LOG.info(
               "Contact point {} resolves to multiple addresses, will use them all ({})",

Diff for: core/src/main/java/com/datastax/oss/driver/internal/core/addresstranslation/Ec2MultiRegionAddressTranslator.java

@@ -19,8 +19,6 @@
 
 import com.datastax.oss.driver.api.core.addresstranslation.AddressTranslator;
 import com.datastax.oss.driver.api.core.context.DriverContext;
-import com.datastax.oss.driver.internal.core.resolver.Resolver;
-import com.datastax.oss.driver.internal.core.resolver.ResolverProvider;
 import com.datastax.oss.driver.internal.core.util.Loggers;
 import com.datastax.oss.driver.shaded.guava.common.annotations.VisibleForTesting;
 import edu.umd.cs.findbugs.annotations.NonNull;
@@ -59,8 +57,6 @@
 public class Ec2MultiRegionAddressTranslator implements AddressTranslator {
 
   private static final Logger LOG = LoggerFactory.getLogger(Ec2MultiRegionAddressTranslator.class);
-  private static Resolver RESOLVER =
-      ResolverProvider.getResolver(Ec2MultiRegionAddressTranslator.class);
 
   private final DirContext ctx;
   private final String logPrefix;
@@ -98,7 +94,7 @@ public InetSocketAddress translate(@NonNull InetSocketAddress socketAddress) {
         return socketAddress;
       }
 
-      InetAddress translatedAddress = RESOLVER.getByName(domainName);
+      InetAddress translatedAddress = InetAddress.getByName(domainName);
       LOG.debug("[{}] Resolved {} to {}", logPrefix, address, translatedAddress);
       return new InetSocketAddress(translatedAddress, socketAddress.getPort());
     } catch (Exception e) {

Diff for: core/src/main/java/com/datastax/oss/driver/internal/core/channel/ChannelFactory.java

@@ -42,8 +42,6 @@
 import com.datastax.oss.driver.internal.core.metrics.SessionMetricUpdater;
 import com.datastax.oss.driver.internal.core.protocol.FrameDecoder;
 import com.datastax.oss.driver.internal.core.protocol.FrameEncoder;
-import com.datastax.oss.driver.internal.core.resolver.Resolver;
-import com.datastax.oss.driver.internal.core.resolver.ResolverProvider;
 import com.datastax.oss.driver.shaded.guava.common.annotations.VisibleForTesting;
 import com.datastax.oss.driver.shaded.guava.common.base.Preconditions;
 import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableMap;
@@ -70,8 +68,6 @@ public class ChannelFactory {
 
   private static final Logger LOG = LoggerFactory.getLogger(ChannelFactory.class);
 
-  private static Resolver RESOLVER = ResolverProvider.getResolver(ChannelFactory.class);
-
   /**
    * A value for {@link #productType} that indicates that we are connected to DataStax Cloud. This
    * value matches the one defined at DSE DB server side at {@code ProductType.java}.
@@ -208,7 +204,7 @@ private void connect(
 
     nettyOptions.afterBootstrapInitialized(bootstrap);
 
-    ChannelFuture connectFuture = bootstrap.connect(RESOLVER.resolve(endPoint.resolve()));
+    ChannelFuture connectFuture = bootstrap.connect(endPoint.resolve());
 
     connectFuture.addListener(
         cf -> {

Diff for: core/src/main/java/com/datastax/oss/driver/internal/core/metadata/SniEndPoint.java

@@ -18,8 +18,6 @@
 package com.datastax.oss.driver.internal.core.metadata;
 
 import com.datastax.oss.driver.api.core.metadata.EndPoint;
-import com.datastax.oss.driver.internal.core.resolver.Resolver;
-import com.datastax.oss.driver.internal.core.resolver.ResolverProvider;
 import com.datastax.oss.driver.shaded.guava.common.primitives.UnsignedBytes;
 import edu.umd.cs.findbugs.annotations.NonNull;
 import java.net.InetAddress;
@@ -32,7 +30,6 @@
 
 public class SniEndPoint implements EndPoint {
   private static final AtomicLong OFFSET = new AtomicLong();
-  private static Resolver RESOLVER = ResolverProvider.getResolver(SniEndPoint.class);
 
   private final InetSocketAddress proxyAddress;
   private final String serverName;
@@ -58,7 +55,7 @@ public String getServerName() {
   @Override
   public InetSocketAddress resolve() {
     try {
-      InetAddress[] aRecords = RESOLVER.getAllByName(proxyAddress.getHostName());
+      InetAddress[] aRecords = InetAddress.getAllByName(proxyAddress.getHostName());
       if (aRecords.length == 0) {
         // Probably never happens, but the JDK docs don't explicitly say so
         throw new IllegalArgumentException(