Package com.github.jsonldjava.utils

Class JarCacheStorage

java.lang.Object
com.github.jsonldjava.utils.JarCacheStorage
All Implemented Interfaces:
org.apache.http.client.cache.HttpCacheStorage
public class JarCacheStorage extends 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 final org.apache.http.impl.client.cache.CacheConfig
    cacheConfig
     
    private static final ConcurrentMap<Object,List<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 ClassLoader
    classLoader
    The classloader to use, defaults to null which will use the thread context classloader.
    private final org.apache.http.client.cache.HttpCacheStorage
    delegate
    All live caching that is not found locally is delegated to this implementation.
    private static final String
    JARCACHE_JSON
    The classpath location that is searched inside of the classloader set for this cache.
    private final com.google.common.cache.LoadingCache<URL,com.fasterxml.jackson.databind.JsonNode>
    jarCaches
    Map from uri of jarcache.json (e.g.
    private final org.slf4j.Logger
    log
     
    private final com.fasterxml.jackson.databind.ObjectMapper
    mapper
     
    private static final 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(ClassLoader classLoader, org.apache.http.impl.client.cache.CacheConfig cacheConfig)
     
    JarCacheStorage(ClassLoader classLoader, org.apache.http.impl.client.cache.CacheConfig cacheConfig, org.apache.http.client.cache.HttpCacheStorage delegate)
     

  • Method Summary

    Modifier and Type
    Method
    Description
    protected org.apache.http.client.cache.HttpCacheEntry
    cacheEntry(URI requestedUri, URL baseURL, com.fasterxml.jackson.databind.JsonNode cacheNode)
     
    org.apache.http.impl.client.cache.CacheConfig
    getCacheConfig()
     
    ClassLoader
    getClassLoader()
     
    org.apache.http.client.cache.HttpCacheEntry
    getEntry(String key)
     
    protected com.fasterxml.jackson.databind.JsonNode
    getJarCache(URL url)
     
    private List<URL>
    getResources()
    Get all of the jarcache.json resources that exist on the classpath
    void
    putEntry(String key, org.apache.http.client.cache.HttpCacheEntry entry)
     
    void
    removeEntry(String key)
     
    void
    setClassLoader(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(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 Details

    • JARCACHE_JSON

      private static final 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:

    • log

      private final org.slf4j.Logger log

    • cacheConfig

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

    • classLoader

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

    • NULL_CLASS_LOADER

      private static final 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<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:

    • cachedResourceList

      private static final ConcurrentMap<Object,List<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 Details

    • JarCacheStorage

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

    • JarCacheStorage

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

  • Method Details

    • getClassLoader

      public ClassLoader getClassLoader()

    • setClassLoader

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

    • getEntry

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

    • getResources

      private List<URL> getResources() throws 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:
      IOException - If there was an IO error while scanning the classpath

    • getJarCache

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

    • cacheEntry

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

    • removeEntry

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

    • updateEntry

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

    • getCacheConfig

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