Preload users when loading strats to speed up loading esp public strats

Model/src/main/java/org/gusdb/wdk/model/user/StrategyLoader.java

@@ -181,10 +181,15 @@ private SearchResult doSearch(String sql, boolean propagateBuildErrors, Object[]
           loadBuilders(sql, paramValues, paramTypes);
 
       // all data loaded; build steps and strats at the specified validation level
-      UserCache userCache = new UserCache(_userFactory);
       List<Strategy> builtStrategies = new ArrayList<>();
       UnbuildableStrategyList<InvalidStrategyStructureException> malstructuredStrategies = new UnbuildableStrategyList<>();
       UnbuildableStrategyList<WdkModelException> stratsWithBuildErrors = new UnbuildableStrategyList<>();
+
+      // load all the users up first (can be done in a single batch) to avoid churn
+      UserCache userCache = new UserCache(_userFactory);
+      userCache.loadUsersByIds(queryResults.getFirst().stream().map(StrategyBuilder::getUserId).collect(Collectors.toList()));
+
+      // try to build each strategy and put in the appropriate list
       for (StrategyBuilder stratBuilder : queryResults.getFirst()) {
         try {
           builtStrategies.add(stratBuilder.build(userCache, _validationLevel, _fillStrategy));

Model/src/main/java/org/gusdb/wdk/model/user/UserCache.java

@@ -1,6 +1,7 @@
 package org.gusdb.wdk.model.user;
 
 import java.util.HashMap;
+import java.util.List;
 
 import org.gusdb.wdk.model.WdkModelException;
 import org.gusdb.wdk.model.WdkRuntimeException;
@@ -25,6 +26,10 @@ public UserCache(User user) {
     _userFactory = null;
   }
 
+  public void loadUsersByIds(List<Long> userIds) {
+    putAll(_userFactory.getUsersById(userIds));
+  }
+
   @Override
   public User get(Object id) {
     try {