SOLR-5799: Add TestRetryUtil.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1573416 13f79535-47bb-0310-9956-ffa450edef68

solr/solrj/src/test/org/apache/solr/common/util/TestRetryUtil.java

@@ -0,0 +1,84 @@
+package org.apache.solr.common.util;
+
+/*
+ * 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.
+ */
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.common.SolrException;
+import org.apache.solr.common.SolrException.ErrorCode;
+import org.apache.solr.common.util.RetryUtil.RetryCmd;
+
+
+public class TestRetryUtil extends SolrTestCaseJ4 {
+
+  public void testRetryOnThrowable() throws Throwable {
+    final AtomicInteger executes = new AtomicInteger();
+    RetryUtil.retryOnThrowable(SolrException.class, 10000, 10, new RetryCmd() {
+      
+      @Override
+      public void execute() throws Throwable {
+        int calls = executes.incrementAndGet();
+        if (calls <= 2) {
+          throw new SolrException(ErrorCode.SERVER_ERROR, "Bad Stuff Happened");
+        }
+      }
+    });
+    
+    assertEquals(3, executes.get());
+    
+    final AtomicInteger executes2 = new AtomicInteger();
+    boolean caughtSolrException = false;
+    try {
+      RetryUtil.retryOnThrowable(IllegalStateException.class, 10000, 10,
+          new RetryCmd() {
+            
+            @Override
+            public void execute() throws Throwable {
+              int calls = executes2.incrementAndGet();
+              if (calls <= 2) {
+                throw new SolrException(ErrorCode.SERVER_ERROR,
+                    "Bad Stuff Happened");
+              }
+            }
+          });
+    } catch (SolrException e) {
+      caughtSolrException = true;
+    }
+    assertTrue(caughtSolrException);
+    assertEquals(1, executes2.get());
+    
+    final AtomicInteger executes3 = new AtomicInteger();
+    caughtSolrException = false;
+    try {
+      RetryUtil.retryOnThrowable(SolrException.class, 1000, 10, new RetryCmd() {
+        
+        @Override
+        public void execute() throws Throwable {
+          executes3.incrementAndGet();
+          throw new SolrException(ErrorCode.SERVER_ERROR, "Bad Stuff Happened");
+        }
+      });
+    } catch (SolrException e) {
+      caughtSolrException = true;
+    }
+    
+    assertTrue(executes3.get() > 1);
+  }
+
+}