APCBagOStuff.php

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<?php
class APCBagOStuff extends BagOStuff {
    public function get( $key, &$casToken = null ) {
        $val = apc_fetch( $key );

        $casToken = $val;

        if ( is_string( $val ) ) {
            if ( $this->isInteger( $val ) ) {
                $val = intval( $val );
            } else {
                $val = unserialize( $val );
            }
        }

        return $val;
    }

    public function set( $key, $value, $exptime = 0 ) {
        if ( !$this->isInteger( $value ) ) {
            $value = serialize( $value );
        }

        apc_store( $key, $value, $exptime );

        return true;
    }

    public function cas( $casToken, $key, $value, $exptime = 0 ) {
        // APC's CAS functions only work on integers
        throw new MWException( "CAS is not implemented in " . __CLASS__ );
    }

    public function delete( $key, $time = 0 ) {
        apc_delete( $key );

        return true;
    }

    public function merge( $key, closure $callback, $exptime = 0, $attempts = 10 ) {
        return $this->mergeViaLock( $key, $callback, $exptime, $attempts );
    }

    public function incr( $key, $value = 1 ) {
        return apc_inc( $key, $value );
    }

    public function decr( $key, $value = 1 ) {
        return apc_dec( $key, $value );
    }
}