Package net.shibboleth.utilities.java.support.httpclient

Class FileCachingHttpClientBuilder

  • public class FileCachingHttpClientBuilder
extends HttpClientBuilder
    An HttpClient builder that supports RFC 2616 caching.

    Cached content is written to disk. Special care should be taken so that multiple clients do not share a single cache directory unintentionally. This could result in sensitive data being available in ways it should not be.

    When using the single-arg constructor variant to wrap an existing instance of CachingHttpClientBuilder, there are several caveats of which to be aware:

    • Several important non-caching-specific caveats are enumerated in this class's superclass HttpClientBuilder.
    • Instances of the following which are set as the default instance on the Apache builder will be unconditionally overwritten by this builder when buildClient() is called:
      • CacheConfig

      This is due to the unfortunate fact that the Apache builder does not currently provide accessor methods to obtain the default instances currently set on the builder. Therefore, if you need to set any default cache config parameters which are not exposed by this builder, then you must use the Apache builder directly and may not use this builder.

    • Field Detail

      • cacheDir

        private File cacheDir
        Directory in which cached content will be stored. Default: System.getProperty("java.io.tmpdir") + File.separator + "wwwcache"

      • maxCacheEntries

        private int maxCacheEntries
        The maximum number of cached responses. Default: 100

      • maxCacheEntrySize

        private long maxCacheEntrySize
        The maximum response body size, in bytes, that will be eligible for caching. Default: 10485760 (10 megabytes)

      • maintentanceTaskInterval

        @Nonnull
private Duration maintentanceTaskInterval
        Interval at which the storage maintenance task should run.

      • managedStorage

        private org.apache.http.impl.client.cache.ManagedHttpCacheStorage managedStorage
        The current managed storage instance.

    • Constructor Detail

      • FileCachingHttpClientBuilder

        public FileCachingHttpClientBuilder()
        Constructor.

      • FileCachingHttpClientBuilder

        public FileCachingHttpClientBuilder​(@Nonnull
                                    org.apache.http.impl.client.cache.CachingHttpClientBuilder builder)
        Constructor.
        Parameters:
        builder - builder of clients used to fetch data from remote servers

    • Method Detail

      • getCacheDirectory

        public File getCacheDirectory()
        Gets the directory in which cached content will be stored.
        Returns:
        directory in which cached content will be stored

      • setCacheDirectory

        public void setCacheDirectory​(@Nonnull @NotEmpty
                              String directoryPath)
        Sets the directory in which cached content will be stored.
        Parameters:
        directoryPath - filesystem path to the directory

      • setCacheDirectory

        public void setCacheDirectory​(@Nonnull
                              File directory)
        Sets the directory in which cached content will be stored.
        Parameters:
        directory - the directory

      • getMaxCacheEntries

        public int getMaxCacheEntries()
        Gets the maximum number of cached responses.
        Returns:
        maximum number of cached responses

      • setMaxCacheEntries

        public void setMaxCacheEntries​(int maxEntries)
        Sets the maximum number of cached responses.
        Parameters:
        maxEntries - maximum number of cached responses, must be greater than zero

      • getMaxCacheEntrySize

        public long getMaxCacheEntrySize()
        Gets the maximum response body size, in bytes, that will be eligible for caching.
        Returns:
        maximum response body size that will be eligible for caching

      • setMaxCacheEntrySize

        public void setMaxCacheEntrySize​(long size)
        Sets the maximum response body size, in bytes, that will be eligible for caching.
        Parameters:
        size - maximum response body size that will be eligible for caching, must be greater than zero

      • getMaintentanceTaskInterval

        @Nonnull
public Duration getMaintentanceTaskInterval()
        Get the interval at which the storage maintenance task should run.
        Returns:
        the maintenance task interval

      • setMaintentanceTaskInterval

        public void setMaintentanceTaskInterval​(@Nonnull
                                        Duration value)
        Set the interval at which the storage maintenance task should run.
        Parameters:
        value - the new maintenance task interval

      • decorateApacheBuilder

        protected void decorateApacheBuilder()
                              throws Exception
        Decorate the Apache builder as determined by this builder's parameters. Subclasses will likely add additional decoration.
        Overrides:
        decorateApacheBuilder in class HttpClientBuilder
        Throws:
        Exception - if there is a problem decorating the Apache builder

      • buildClient

        public org.apache.http.client.HttpClient buildClient()
                                              throws Exception
        Constructs an HttpClient using the settings of this builder.
        Overrides:
        buildClient in class HttpClientBuilder
        Returns:
        the constructed client
        Throws:
        Exception - if there is any problem building the new client instance