HttpCacheOperationException to signal that HttpCacheStorage encountered an error performing an caching operation

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@987818 13f79535-47bb-0310-9956-ffa450edef68

httpclient-cache/src/main/java/org/apache/http/client/cache/HttpCacheOperationException.java

@@ -0,0 +1,49 @@
+/*
+ * ====================================================================
+ * 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package org.apache.http.client.cache;
+
+import java.io.IOException;
+
+/**
+ * Signals that {@link HttpCacheStorage} encountered an error performing an caching operation.
+ *
+ * @since 4.1
+ */
+public class HttpCacheOperationException extends IOException {
+
+    private static final long serialVersionUID = 823573584868632876L;
+
+    public HttpCacheOperationException(String message) {
+        super(message);
+    }
+
+    public HttpCacheOperationException(String message, Throwable cause) {
+        super(message);
+        initCause(cause);
+    }
+
+}

httpclient-cache/src/main/java/org/apache/http/impl/client/cache/ehcache/EhcacheHttpCacheStorage.java

@@ -35,6 +35,7 @@ import net.sf.ehcache.Element;
 
 import org.apache.http.client.cache.HttpCacheEntry;
 import org.apache.http.client.cache.HttpCacheEntrySerializer;
+import org.apache.http.client.cache.HttpCacheOperationException;
 import org.apache.http.client.cache.HttpCacheStorage;
 import org.apache.http.client.cache.HttpCacheUpdateCallback;
 import org.apache.http.impl.client.cache.DefaultHttpCacheEntrySerializer;
@@ -95,7 +96,7 @@ public class EhcacheHttpCacheStorage implements HttpCacheStorage {
             serializer.writeTo(updatedEntry, bos);
             Element newElement = new Element(key, bos.toByteArray());
             if (!cache.replace(oldElement, newElement)) {
-                throw new IOException();
+                throw new HttpCacheOperationException("Replace operation failed");
             }
         }
     }