NAME
    `IO::Async::Resolver::StupidCache' - a trivial caching layer around an
    `IO::Async::Resolver'

SYNOPSIS
     use IO::Async::Loop 0.62;
     use IO::Async::Resolver::StupidCache;

     my $loop = IO::Async::Loop->new;

     # Wrap the existing resolver in a cache
     $loop->set_resolver(
        IO::Async::Resolver::StupidCache->new( source => $loop->resolver )
     );

     # $loop->resolve requests will now be cached

DESCRIPTION
    This object class provides a wrapper around another IO::Async::Resolver
    instance, which applies a simple caching layer to avoid making identical
    lookups. This can be useful, for example, when performing a large number
    of HTTP requests to the same host or a small set of hosts, or other
    cases where it is expected that the same few resolver queries will be
    made over and over.

    This is called a "stupid" cache because it is made without awareness of
    TTL values or other cache-relevant information that may be provided by
    DNS or other resolve methods. As such, it should not be relied upon to
    give always-accurate answers.

PARAMETERS
    The following named parameters may be passed to `new' or `configure':

    source => IO::Async::Resolver
            Optional. The source of the cache data. If not supplied, a new
            `IO::Async::Resolver' instance will be constructed.

    ttl => INT
            Optional. Time-to-live of cache entries in seconds. If not
            supplied a default of 5 minutes will apply.

    max_size => INT
            Optional. Maximum number of entries to keep in the cache.
            Entries will be evicted at random over this limit. If not
            supplied a default of 1000 entries will apply.

METHODS
    The following methods documented with a trailing call to `->get' return
    Future instances.

  $resolver = $cache->source
    Returns the source resolver

  @result = $cache->resolve( %args )->get
  @addrs = $cache->getaddrinfo( %args )->get
  ( $host, $service ) = $cache->getnameinfo( %args )->get
    These methods perform identically to the base `IO::Async::Resolver'
    class, except that the results are cached.

    Returned `Futures' are created with the `without_cancel' method, so that
    multiple concurrent waiters are shielded from cancellation by one
    another.

AUTHOR
    Paul Evans <leonerd@leonerd.org.uk>

