ResponseCache

ResponseCache

java.net

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Java 5.0

This abstract class defines an API for low-level caching of network resources retrieved through the URL and URLConnection classes. This class is intended for use by URLStreamHandler implementations , not by casual users of the java.net package. Clients that wish to enable local caching should register a ResponseCache implementation with setDefault( ) and enable caching with URLConnection.setDefaultUseCaches( ) .

The static geTDefault( ) and setDefault( ) methods query and set a ResponseCache for the system. If there is a ResponseCache installed, protocol handlers should call put( ) to offer a network resource to the cache. If the cache is interested, it returns a CacheRequest object into which the URLStreamHandler can write its data. A URLStreamHandler that wants to query the cache should call get( ) . If the ResponseCache holds a cached copy of the requested resource, it returns a CacheResponse from which the URLStreamHandler can read the resource.

 public abstract class  ResponseCache  {  // Public Constructors  public  ResponseCache  ( );  // Public Class Methods  public static ResponseCache  getDefault  ( );  synchronized  public static void  setDefault  (ResponseCache  responseCache  );  synchronized   // Public Instance Methods  public abstract CacheResponse  get  (URI  uri  , String  rqstMethod  ,  java.util.Map<String,java.util.List<String>>  rqstHeaders  )          throws java.io.IOException;      public abstract CacheRequest  put  (URI  uri  , URLConnection  conn  )          throws java.io.IOException;   }