Author: markt
Date: Fri Sep 21 22:27:26 2012
New Revision: 1388709
URL: http://svn.apache.org/viewvc?rev=1388709&view=rev
Log:
When the DefaultServlet is under high load, parsing the content-type header
generates significant garbage and takes noticeable time. Add a simple cache to
address these issues.
Added:
tomcat/trunk/java/org/apache/tomcat/util/collections/ConcurrentCache.java
- copied, changed from r1387957,
tomcat/trunk/java/org/apache/el/util/ConcurrentCache.java
tomcat/trunk/java/org/apache/tomcat/util/http/parser/MediaTypeCache.java
(with props)
Modified:
tomcat/trunk/java/org/apache/catalina/connector/Response.java
Modified: tomcat/trunk/java/org/apache/catalina/connector/Response.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/connector/Response.java?rev=1388709&r1=1388708&r2=1388709&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/connector/Response.java (original)
+++ tomcat/trunk/java/org/apache/catalina/connector/Response.java Fri Sep 21
22:27:26 2012
@@ -18,7 +18,6 @@ package org.apache.catalina.connector;
import java.io.IOException;
import java.io.PrintWriter;
-import java.io.StringReader;
import java.net.MalformedURLException;
import java.security.AccessController;
import java.security.PrivilegedAction;
@@ -51,8 +50,7 @@ import org.apache.tomcat.util.buf.UEncod
import org.apache.tomcat.util.http.FastHttpDateFormat;
import org.apache.tomcat.util.http.MimeHeaders;
import org.apache.tomcat.util.http.ServerCookie;
-import org.apache.tomcat.util.http.parser.AstMediaType;
-import org.apache.tomcat.util.http.parser.HttpParser;
+import org.apache.tomcat.util.http.parser.MediaTypeCache;
import org.apache.tomcat.util.http.parser.ParseException;
import org.apache.tomcat.util.net.URL;
import org.apache.tomcat.util.res.StringManager;
@@ -71,6 +69,9 @@ public class Response
// ----------------------------------------------------------- Constructors
+ private static final MediaTypeCache MEDIA_TYPE_CACHE =
+ new MediaTypeCache(100);
+
/**
* Compliance with SRV.15.2.22.1. A call to Response.getWriter() if no
* character encoding has been specified will result in subsequent calls to
@@ -708,10 +709,9 @@ public class Response
return;
}
- AstMediaType m = null;
- HttpParser hp = new HttpParser(new StringReader(type));
+ String[] m = null;
try {
- m = hp.MediaType();
+ m = MEDIA_TYPE_CACHE.parse(type);
} catch (ParseException e) {
// Invalid - Assume no charset and just pass through whatever
// the user provided.
@@ -719,13 +719,12 @@ public class Response
return;
}
- coyoteResponse.setContentTypeNoCharset(m.toStringNoCharset());
+ coyoteResponse.setContentTypeNoCharset(m[0]);
- String charset = m.getCharset();
- if (charset != null) {
+ if (m[1] != null) {
// Ignore charset if getWriter() has already been called
if (!usingWriter) {
- coyoteResponse.setCharacterEncoding(charset);
+ coyoteResponse.setCharacterEncoding(m[1]);
isCharacterEncodingSet = true;
}
}
Copied:
tomcat/trunk/java/org/apache/tomcat/util/collections/ConcurrentCache.java (from
r1387957, tomcat/trunk/java/org/apache/el/util/ConcurrentCache.java)
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/tomcat/util/collections/ConcurrentCache.java?p2=tomcat/trunk/java/org/apache/tomcat/util/collections/ConcurrentCache.java&p1=tomcat/trunk/java/org/apache/el/util/ConcurrentCache.java&r1=1387957&r2=1388709&rev=1388709&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/el/util/ConcurrentCache.java (original)
+++ tomcat/trunk/java/org/apache/tomcat/util/collections/ConcurrentCache.java
Fri Sep 21 22:27:26 2012
@@ -14,7 +14,7 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-package org.apache.el.util;
+package org.apache.tomcat.util.collections;
import java.util.Map;
import java.util.WeakHashMap;
Added: tomcat/trunk/java/org/apache/tomcat/util/http/parser/MediaTypeCache.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/tomcat/util/http/parser/MediaTypeCache.java?rev=1388709&view=auto
==============================================================================
--- tomcat/trunk/java/org/apache/tomcat/util/http/parser/MediaTypeCache.java
(added)
+++ tomcat/trunk/java/org/apache/tomcat/util/http/parser/MediaTypeCache.java
Fri Sep 21 22:27:26 2012
@@ -0,0 +1,61 @@
+/*
+ * 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.tomcat.util.http.parser;
+
+import java.io.StringReader;
+
+import org.apache.tomcat.util.collections.ConcurrentCache;
+
+/**
+ * Caches the results of parsing content-type headers.
+ */
+public class MediaTypeCache {
+
+ private final ConcurrentCache<String,String[]> cache;
+
+ public MediaTypeCache(int size) {
+ cache = new ConcurrentCache<>(size);
+ }
+
+ /**
+ * Looks in the cache and returns the cached value if one is present. If no
+ * match exists in the cache, a new parser is created, the input parsed and
+ * the results placed in the cache and returned to the user.
+ *
+ * @param input The content-type header value to parse
+ * @return The results are provided as a two element String array. The
+ * first element is the media type less the charset and
+ * the second element is the charset
+ *
+ * @throws ParseException if the input cannot be parsed
+ */
+ public String[] parse(String input) throws ParseException {
+ String[] result = cache.get(input);
+
+ if (result != null) {
+ return result;
+ }
+
+ HttpParser hp = new HttpParser(new StringReader(input));
+ AstMediaType m = hp.MediaType();
+
+ result = new String[] {m.toStringNoCharset(), m.getCharset()};
+ cache.put(input, result);
+
+ return result;
+ }
+}
Propchange:
tomcat/trunk/java/org/apache/tomcat/util/http/parser/MediaTypeCache.java
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