spring PathPatternMatchableHandlerMapping 源码
spring PathPatternMatchableHandlerMapping 代码
文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/handler/PathPatternMatchableHandlerMapping.java
/*
* Copyright 2002-2021 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.web.servlet.handler;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.http.server.PathContainer;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.web.servlet.HandlerExecutionChain;
import org.springframework.web.util.ServletRequestPathUtils;
import org.springframework.web.util.pattern.PathPattern;
import org.springframework.web.util.pattern.PathPatternParser;
/**
* Wraps {@link MatchableHandlerMapping}s configured with a {@link PathPatternParser}
* in order to parse patterns lazily and cache them for re-ues.
*
* @author Rossen Stoyanchev
* @since 5.3
*/
class PathPatternMatchableHandlerMapping implements MatchableHandlerMapping {
private static final int MAX_PATTERNS = 1024;
private final MatchableHandlerMapping delegate;
private final PathPatternParser parser;
private final Map<String, PathPattern> pathPatternCache = new ConcurrentHashMap<>();
public PathPatternMatchableHandlerMapping(MatchableHandlerMapping delegate) {
Assert.notNull(delegate, "Delegate MatchableHandlerMapping is required.");
Assert.notNull(delegate.getPatternParser(), "PatternParser is required.");
this.delegate = delegate;
this.parser = delegate.getPatternParser();
}
@Nullable
@Override
public RequestMatchResult match(HttpServletRequest request, String pattern) {
PathPattern pathPattern = this.pathPatternCache.computeIfAbsent(pattern, value -> {
Assert.isTrue(this.pathPatternCache.size() < MAX_PATTERNS, "Max size for pattern cache exceeded.");
return this.parser.parse(pattern);
});
PathContainer path = ServletRequestPathUtils.getParsedRequestPath(request).pathWithinApplication();
return (pathPattern.matches(path) ? new RequestMatchResult(pathPattern, path) : null);
}
@Nullable
@Override
public HandlerExecutionChain getHandler(HttpServletRequest request) throws Exception {
return this.delegate.getHandler(request);
}
}
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