dsmiley commented on code in PR #2724:
URL: https://github.com/apache/solr/pull/2724#discussion_r1779101220


##########
solr/solrj/src/java/org/apache/solr/client/solrj/SolrClient.java:
##########
@@ -1225,4 +1228,30 @@ public SolrRequest.SolrClientContext getContext() {
   public String getDefaultCollection() {
     return defaultCollection;
   }
+
+  /**
+   * Execute an asynchronous request against a Solr server for a given 
collection.
+   *
+   * @param request the request to execute
+   * @param collection the collection to execute the request against
+   * @return a {@link CompletableFuture} that tracks the progress of the async 
request. Supports
+   *     cancelling requests via {@link CompletableFuture#cancel(boolean)}, 
adding callbacks/error
+   *     handling using {@link CompletableFuture#whenComplete(BiConsumer)} and 
{@link
+   *     CompletableFuture#exceptionally(Function)} methods, and other 
CompletableFuture
+   *     functionality. Will complete exceptionally in case of either an 
{@link IOException} or
+   *     {@link SolrServerException} during the request. Once completed, the 
CompletableFuture will
+   *     contain a {@link NamedList} with the response from the server.
+   */
+  public abstract CompletableFuture<NamedList<Object>> requestAsync(

Review Comment:
   why not add a default impl throwing UnsupportedOperationException here?



##########
solr/solrj/src/java/org/apache/solr/client/solrj/SolrClient.java:
##########
@@ -1225,4 +1228,30 @@ public SolrRequest.SolrClientContext getContext() {
   public String getDefaultCollection() {
     return defaultCollection;
   }
+
+  /**
+   * Execute an asynchronous request against a Solr server for a given 
collection.
+   *
+   * @param request the request to execute
+   * @param collection the collection to execute the request against
+   * @return a {@link CompletableFuture} that tracks the progress of the async 
request. Supports
+   *     cancelling requests via {@link CompletableFuture#cancel(boolean)}, 
adding callbacks/error
+   *     handling using {@link CompletableFuture#whenComplete(BiConsumer)} and 
{@link
+   *     CompletableFuture#exceptionally(Function)} methods, and other 
CompletableFuture
+   *     functionality. Will complete exceptionally in case of either an 
{@link IOException} or
+   *     {@link SolrServerException} during the request. Once completed, the 
CompletableFuture will
+   *     contain a {@link NamedList} with the response from the server.
+   */
+  public abstract CompletableFuture<NamedList<Object>> requestAsync(
+      final SolrRequest<?> request, String collection);
+
+  /**
+   * Execute an asynchronous request against a Solr server using the default 
collection.
+   *
+   * @param request the request to execute
+   * @return a {@link CompletableFuture} see {@link #requestAsync(SolrRequest, 
String)}.
+   */
+  public CompletableFuture<NamedList<Object>> requestAsync(final 
SolrRequest<?> request) {

Review Comment:
   should be final



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