Velocity模板缓存配置-优快云博客

本文介绍了Velocity模板引擎在线上环境中如何通过配置开启缓存功能，并详细解析了从配置到获取模板过程中涉及的关键代码路径。

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velocity开启缓存，主要用于线上环境，在velocity.properties中

file.resource.loader.cache = true
file.resource.loader.modificationCheckInterval = -1

拨开读取模板代码：

Template t = getTemplate(stack, velocityManager.getVelocityEngine(), invocation, finalLocation, encoding);

VelocityResult.java :
protected Template getTemplate(ValueStack stack, VelocityEngine velocity, ActionInvocation invocation, String location, String encoding) throws Exception {
        if (!location.startsWith("/")) {
            location = invocation.getProxy().getNamespace() + "/" + location;
        }

        Template template = velocity.getTemplate(location, encoding);

        return template;
    }

VelocityEngine.java
public Template getTemplate(String name, String encoding)
        throws ResourceNotFoundException, ParseErrorException, Exception
    {
        return ri.getTemplate( name, encoding );
    }

RuntimeInstance.java
public Template getTemplate(String name, String  encoding)
        throws ResourceNotFoundException, ParseErrorException, Exception
    {
        requireInitialization();

        return (Template)
                resourceManager.getResource(name,
                    ResourceManager.RESOURCE_TEMPLATE, encoding);
    }

ResourceManagerImpl.java
public Resource getResource(final String resourceName, final int resourceType, final String encoding)
        throws ResourceNotFoundException,
            ParseErrorException,
            Exception
    {
        String resourceKey = resourceType + resourceName;
        Resource resource = globalCache.get(resourceKey);

ResourceCacheImpl.java
public Resource get( Object key )
    {
        return (Resource) cache.get( key );
    }