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Improve Tomcat performance when using nested jars

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Add `NestedJarResourceSet` which can be used for nested jar URLs
and unlike the standard Tomcat implementation does not assume that
the JAR is backed by a single file.

Closes gh-37452
pull/37640/head
Phillip Webb 1 year ago
parent 7ad4a9817d
commit fd9b2b114e
2 changed files with 192 additions and 9 deletions
Show Stats Download Patch File Download Diff File

161
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/tomcat/NestedJarResourceSet.java
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@ -0,0 +1,161 @@
/*
* Copyright 2012-2023 the original author or authors.
*
* Licensed 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
*
* https://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.springframework.boot.web.embedded.tomcat;
import java.io.IOException;
import java.net.JarURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.jar.Attributes;
import java.util.jar.Attributes.Name;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.WebResource;
import org.apache.catalina.WebResourceRoot;
import org.apache.catalina.WebResourceSet;
import org.apache.catalina.webresources.AbstractSingleArchiveResourceSet;
import org.apache.catalina.webresources.JarResource;
import org.springframework.util.Assert;
import org.springframework.util.ResourceUtils;
/**
* A {@link WebResourceSet} for a resource in a nested JAR.
*
* @author Phillip Webb
*/
class NestedJarResourceSet extends AbstractSingleArchiveResourceSet {
private static final Name MULTI_RELEASE = new Name("Multi-Release");
private final URL url;
private JarFile archive = null;
private long archiveUseCount = 0;
private boolean useCaches;
private volatile Boolean multiRelease;
NestedJarResourceSet(URL url, WebResourceRoot root, String webAppMount, String internalPath)
throws IllegalArgumentException {
this.url = url;
setRoot(root);
setWebAppMount(webAppMount);
setInternalPath(internalPath);
setStaticOnly(true);
if (getRoot().getState().isAvailable()) {
try {
start();
}
catch (LifecycleException ex) {
throw new IllegalStateException(ex);
}
}
}
@Override
protected WebResource createArchiveResource(JarEntry jarEntry, String webAppPath, Manifest manifest) {
return new JarResource(this, webAppPath, getBaseUrlString(), jarEntry);
}
@Override
protected void initInternal() throws LifecycleException {
try {
JarURLConnection connection = connect();
try {
setManifest(connection.getManifest());
setBaseUrl(connection.getJarFileURL());
}
finally {
if (!connection.getUseCaches()) {
connection.getJarFile().close();
}
}
}
catch (IOException ex) {
throw new IllegalStateException(ex);
}
}
@Override
protected JarFile openJarFile() throws IOException {
synchronized (this.archiveLock) {
if (this.archive == null) {
JarURLConnection connection = connect();
this.useCaches = connection.getUseCaches();
this.archive = connection.getJarFile();
}
this.archiveUseCount++;
return this.archive;
}
}
@Override
protected void closeJarFile() {
synchronized (this.archiveLock) {
this.archiveUseCount--;
}
}
@Override
protected boolean isMultiRelease() {
if (this.multiRelease == null) {
synchronized (this.archiveLock) {
if (this.multiRelease == null) {
// JarFile.isMultiRelease() is final so we must go to the manifest
Manifest manifest = getManifest();
Attributes attributes = (manifest != null) ? manifest.getMainAttributes() : null;
this.multiRelease = (attributes != null) ? attributes.containsKey(MULTI_RELEASE) : false;
}
}
}
return this.multiRelease.booleanValue();
}
@Override
public void gc() {
synchronized (this.archiveLock) {
if (this.archive != null && this.archiveUseCount == 0) {
try {
if (!this.useCaches) {
this.archive.close();
}
}
catch (IOException ex) {
// Ignore
}
this.archive = null;
this.archiveEntries = null;
}
}
}
private JarURLConnection connect() throws IOException {
URLConnection connection = this.url.openConnection();
ResourceUtils.useCachesIfNecessary(connection);
Assert.state(connection instanceof JarURLConnection,
() -> "URL '%s' did not return a JAR connection".formatted(this.url));
connection.connect();
return (JarURLConnection) connection;
}
}

40
spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/tomcat/TomcatServletWebServerFactory.java
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@ -19,6 +19,7 @@ package org.springframework.boot.web.embedded.tomcat;
import java.io.File;
import java.io.InputStream;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
@ -46,6 +47,7 @@ import org.apache.catalina.LifecycleListener;
import org.apache.catalina.Manager;
import org.apache.catalina.Valve;
import org.apache.catalina.WebResource;
import org.apache.catalina.WebResourceRoot;
import org.apache.catalina.WebResourceRoot.ResourceSetType;
import org.apache.catalina.WebResourceSet;
import org.apache.catalina.Wrapper;
@ -772,6 +774,10 @@ public class TomcatServletWebServerFactory extends AbstractServletWebServerFacto
private final class StaticResourceConfigurer implements LifecycleListener {
private static final String WEB_APP_MOUNT = "/";
private static final String INTERNAL_PATH = "/META-INF/resources";
private final Context context;
private StaticResourceConfigurer(Context context) {
@ -804,23 +810,39 @@ public class TomcatServletWebServerFactory extends AbstractServletWebServerFacto
private void addResourceSet(String resource) {
try {
if (isInsideNestedJar(resource)) {
// It's a nested jar but we now don't want the suffix because Tomcat
// is going to try and locate it as a root URL (not the resource
// inside it)
resource = resource.substring(0, resource.length() - 2);
if (isInsideClassicNestedJar(resource)) {
addClassicNestedResourceSet(resource);
return;
}
WebResourceRoot root = this.context.getResources();
URL url = new URL(resource);
String path = "/META-INF/resources";
this.context.getResources().createWebResourceSet(ResourceSetType.RESOURCE_JAR, "/", url, path);
if (isInsideNestedJar(resource)) {
root.addJarResources(new NestedJarResourceSet(url, root, WEB_APP_MOUNT, INTERNAL_PATH));
}
else {
root.createWebResourceSet(ResourceSetType.RESOURCE_JAR, WEB_APP_MOUNT, url, INTERNAL_PATH);
}
}
catch (Exception ex) {
// Ignore (probably not a directory)
}
}
private boolean isInsideNestedJar(String dir) {
return dir.indexOf("!/") < dir.lastIndexOf("!/");
private void addClassicNestedResourceSet(String resource) throws MalformedURLException {
// It's a nested jar but we now don't want the suffix because Tomcat
// is going to try and locate it as a root URL (not the resource
// inside it)
URL url = new URL(resource.substring(0, resource.length() - 2));
this.context.getResources()
.createWebResourceSet(ResourceSetType.RESOURCE_JAR, WEB_APP_MOUNT, url, INTERNAL_PATH);
}
private boolean isInsideClassicNestedJar(String resource) {
return !isInsideNestedJar(resource) && resource.indexOf("!/") < resource.lastIndexOf("!/");
}
private boolean isInsideNestedJar(String resource) {
return resource.startsWith("jar:nested:");
}
}

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