SOLR-11368: Abstract out DistibutedQueue as an interface

solr/solrj/src/java/org/apache/solr/common/cloud/DistributedQueue.java

@@ -0,0 +1,41 @@
+/*
+ * 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.solr.common.cloud;
+
+import java.util.Collection;
+import java.util.function.Predicate;
+
+import org.apache.solr.common.util.Pair;
+
+public interface DistributedQueue {
+  byte[] peek() throws Exception;
+
+  byte[] peek(boolean block) throws Exception;
+
+  byte[] peek(long wait) throws Exception;
+
+  byte[] poll() throws Exception;
+
+  byte[] remove() throws Exception;
+
+  byte[] take() throws Exception;
+
+  void offer(byte[] data) throws Exception;
+
+  Collection<Pair<String, byte[]>> peekElements(int max, long waitMillis, Predicate<String> acceptFilter) throws Exception;
+
+}