Package com.github.jsonldjava.utils

Class JarCacheStorage

  • All Implemented Interfaces:
    org.apache.http.client.cache.HttpCacheStorage
    public class JarCacheStorage
extends java.lang.Object
implements org.apache.http.client.cache.HttpCacheStorage
    Implementation of the Apache HttpClient HttpCacheStorage interface using jarcache.json files on the classpath to identify static JSON-LD resources on the classpath, to avoid retrieving them.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private org.apache.http.impl.client.cache.CacheConfig cacheConfig  
      private static java.util.concurrent.ConcurrentMap<java.lang.Object,​java.util.List<java.net.URL>> cachedResourceList
      Cached URLs from the given ClassLoader to identified locations of jarcache.json resources on the classpath Uses a Guava concurrent weak reference key map to avoid holding onto ClassLoader instances after they are otherwise unavailable.
      private java.lang.ClassLoader classLoader
      The classloader to use, defaults to null which will use the thread context classloader.
      private org.apache.http.client.cache.HttpCacheStorage delegate
      All live caching that is not found locally is delegated to this implementation.
      private static java.lang.String JARCACHE_JSON
      The classpath location that is searched inside of the classloader set for this cache.
      private com.google.common.cache.LoadingCache<java.net.URL,​com.fasterxml.jackson.databind.JsonNode> jarCaches
      Map from uri of jarcache.json (e.g.
      private org.slf4j.Logger log  
      private com.fasterxml.jackson.databind.ObjectMapper mapper  
      private static java.lang.Object NULL_CLASS_LOADER
      A holder for the case where the System class loader needs to be used, but cannot be directly identified in another way.

    • Constructor Summary

      Constructors 
      Constructor Description
      JarCacheStorage​(java.lang.ClassLoader classLoader, org.apache.http.impl.client.cache.CacheConfig cacheConfig)  
      JarCacheStorage​(java.lang.ClassLoader classLoader, org.apache.http.impl.client.cache.CacheConfig cacheConfig, org.apache.http.client.cache.HttpCacheStorage delegate)  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      protected org.apache.http.client.cache.HttpCacheEntry cacheEntry​(java.net.URI requestedUri, java.net.URL baseURL, com.fasterxml.jackson.databind.JsonNode cacheNode)  
      org.apache.http.impl.client.cache.CacheConfig getCacheConfig()  
      java.lang.ClassLoader getClassLoader()  
      org.apache.http.client.cache.HttpCacheEntry getEntry​(java.lang.String key)  
      protected com.fasterxml.jackson.databind.JsonNode getJarCache​(java.net.URL url)  
      private java.util.List<java.net.URL> getResources()
      Get all of the jarcache.json resources that exist on the classpath
      void putEntry​(java.lang.String key, org.apache.http.client.cache.HttpCacheEntry entry)  
      void removeEntry​(java.lang.String key)  
      void setClassLoader​(java.lang.ClassLoader classLoader)
      Sets the ClassLoader used internally to a new value, or null to use Thread.currentThread() and Thread.getContextClassLoader() for each access.
      void updateEntry​(java.lang.String key, org.apache.http.client.cache.HttpCacheUpdateCallback callback)  

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • JARCACHE_JSON

        private static final java.lang.String JARCACHE_JSON
        The classpath location that is searched inside of the classloader set for this cache. Note this search is also done on the Thread contextClassLoader if none is explicitly set, and the System classloader if there is no contextClassLoader.
        See Also:
        Constant Field Values

      • log

        private final org.slf4j.Logger log

      • cacheConfig

        private final org.apache.http.impl.client.cache.CacheConfig cacheConfig

      • classLoader

        private java.lang.ClassLoader classLoader
        The classloader to use, defaults to null which will use the thread context classloader.

      • NULL_CLASS_LOADER

        private static final java.lang.Object NULL_CLASS_LOADER
        A holder for the case where the System class loader needs to be used, but cannot be directly identified in another way. Used as a key in cachedResourceList.

      • delegate

        private final org.apache.http.client.cache.HttpCacheStorage delegate
        All live caching that is not found locally is delegated to this implementation.

      • mapper

        private final com.fasterxml.jackson.databind.ObjectMapper mapper

      • jarCaches

        private final com.google.common.cache.LoadingCache<java.net.URL,​com.fasterxml.jackson.databind.JsonNode> jarCaches
        Map from uri of jarcache.json (e.g. jar://blab.jar!jarcache.json) to a SoftReference to its parsed content as JsonNode.
        See Also:
        getJarCache(URL)

      • cachedResourceList

        private static final java.util.concurrent.ConcurrentMap<java.lang.Object,​java.util.List<java.net.URL>> cachedResourceList
        Cached URLs from the given ClassLoader to identified locations of jarcache.json resources on the classpath Uses a Guava concurrent weak reference key map to avoid holding onto ClassLoader instances after they are otherwise unavailable.

    • Constructor Detail

      • JarCacheStorage

        public JarCacheStorage​(java.lang.ClassLoader classLoader,
                       org.apache.http.impl.client.cache.CacheConfig cacheConfig)

      • JarCacheStorage

        public JarCacheStorage​(java.lang.ClassLoader classLoader,
                       org.apache.http.impl.client.cache.CacheConfig cacheConfig,
                       org.apache.http.client.cache.HttpCacheStorage delegate)

    • Method Detail

      • getClassLoader

        public java.lang.ClassLoader getClassLoader()

      • setClassLoader

        public void setClassLoader​(java.lang.ClassLoader classLoader)
        Sets the ClassLoader used internally to a new value, or null to use Thread.currentThread() and Thread.getContextClassLoader() for each access.
        Parameters:
        classLoader - The classloader to use, or null to use the thread context classloader

      • putEntry

        public void putEntry​(java.lang.String key,
                     org.apache.http.client.cache.HttpCacheEntry entry)
              throws java.io.IOException
        Specified by:
        putEntry in interface org.apache.http.client.cache.HttpCacheStorage
        Throws:
        java.io.IOException

      • getEntry

        public org.apache.http.client.cache.HttpCacheEntry getEntry​(java.lang.String key)
                                                     throws java.io.IOException
        Specified by:
        getEntry in interface org.apache.http.client.cache.HttpCacheStorage
        Throws:
        java.io.IOException

      • getResources

        private java.util.List<java.net.URL> getResources()
                                           throws java.io.IOException
        Get all of the jarcache.json resources that exist on the classpath
        Returns:
        A cached list of jarcache.json classpath resources as URLs
        Throws:
        java.io.IOException - If there was an IO error while scanning the classpath

      • getJarCache

        protected com.fasterxml.jackson.databind.JsonNode getJarCache​(java.net.URL url)
                                                       throws java.io.IOException
        Throws:
        java.io.IOException

      • cacheEntry

        protected org.apache.http.client.cache.HttpCacheEntry cacheEntry​(java.net.URI requestedUri,
                                                                 java.net.URL baseURL,
                                                                 com.fasterxml.jackson.databind.JsonNode cacheNode)
                                                          throws java.net.MalformedURLException,
                                                                 java.io.IOException
        Throws:
        java.net.MalformedURLException
        java.io.IOException

      • removeEntry

        public void removeEntry​(java.lang.String key)
                 throws java.io.IOException
        Specified by:
        removeEntry in interface org.apache.http.client.cache.HttpCacheStorage
        Throws:
        java.io.IOException

      • updateEntry

        public void updateEntry​(java.lang.String key,
                        org.apache.http.client.cache.HttpCacheUpdateCallback callback)
                 throws java.io.IOException,
                        org.apache.http.client.cache.HttpCacheUpdateException
        Specified by:
        updateEntry in interface org.apache.http.client.cache.HttpCacheStorage
        Throws:
        java.io.IOException
        org.apache.http.client.cache.HttpCacheUpdateException

      • getCacheConfig

        public org.apache.http.impl.client.cache.CacheConfig getCacheConfig()