pivotal-jbarrett commented on a change in pull request #7436:
URL: https://github.com/apache/geode/pull/7436#discussion_r829562830



##########
File path: 
geode-core/src/main/java/org/apache/geode/cache/client/internal/LocatorList.java
##########
@@ -0,0 +1,121 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more 
contributor license
+ * agreements. See the NOTICE file distributed with this work for additional 
information regarding
+ * copyright ownership. The ASF licenses this file to You under the Apache 
License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the 
License. You may obtain a
+ * copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software 
distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 
KIND, either express
+ * or implied. See the License for the specific language governing permissions 
and limitations under
+ * the License.
+ */
+
+package org.apache.geode.cache.client.internal;
+
+import java.net.InetSocketAddress;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Iterator;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.commons.lang3.StringUtils;
+import org.jetbrains.annotations.NotNull;
+
+import org.apache.geode.annotations.Immutable;
+import org.apache.geode.distributed.internal.tcpserver.HostAndPort;
+
+/**
+ * A list of locators, which remembers the last known good locator.
+ */
+class LocatorList implements Iterable<@NotNull HostAndPort> {
+  /**
+   * A Comparator used to sort a list of locator addresses. This should not be 
used in other ways as
+   * it can return zero when two addresses aren't actually equal.
+   */
+  @Immutable
+  static final Comparator<@NotNull HostAndPort> SOCKET_ADDRESS_COMPARATOR =
+      (address, otherAddress) -> {

Review comment:
       The original code had `null` checks for something that could never be 
`null` since that would have caused `NullPointerException` elsewhere. By 
defining the values as `@NotNull` we can let the static analyzer enforce this 
too. 




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