PHP Design notes

better-AIO.php

<?php

interface IdentifiableInterface {
    public function identify() : string;
}

interface HashableInterface {
    public function getHash(IdentifiableInterface $obj) : string;
}

interface PersistableInterface {
    public function persist();
}

interface RestorableInterface {
    public function restore(string $pk);
}

interface PersistableRestorableInterface extends PersistableInterface, RestorableInterface {
}

interface CodecInterface {
    public function encode($in);
    public function decode($in);
}

interface StorageInterface {
    public function put(string $hash, $object);
    public function get(string $hash);
}

final class PhpSerializerCodec implements CodecInterface {
    public function encode($in) {
        return serialize($in);
    }
    
    public function decode($in) {
        return unserialize($in);
    }
}

final class ApcStorage implements StorageInterface {
    public function __construct(CodecInterface $codec) {
        $this->_codec = $codec;
    }
    
    public function put(string $hash, $object) {
        apc_store($hash, $this->_codec->encode($object));
    }
    
    public function get(string $hash) {
        return $this->_codec->decode(apc_fetch($hash));
    }
}

final class ClassHasher implements HashableInterface {
    public function getHash(IdentifiableInterface $object) {
        return sprintf("%s%s", get_class($object), $object->identify());
    }
}

final class Pk implements IdentifiableInterface {
    protected $_value;
    public function __construct(string $pk) {
        $this->_value = $pk;
    }
    public function identify() : string {
        return $this->_value;
    }
}

final class MyClassC implements PersistableRestoreableInterface, IdentifiableInterface {
    protected $_hasher;
    protected $_storage;
    public $id;
    
    public function __construct(HashableInterface $hasher, StorageInterface $storage) {
        $this->_hasher = $hasher;
        $this->_storage = $storage;
    }
    
    public function persist() {
        $this->_storage->put($this->hasher->getHash($this), $this);
    }
    
    public function restore(string $pk='') {
        return $this->_storage->get(
            $this->hasher->getHash(
                ( (strlen($pk)>0) ? new Pk($pk) : $this )
            )
        );
    }
    
    public function identify() : string {
        return $this->id;
    }
}

trivial-example.php

<?php

class MyClassA {
  public $_id;
  
  public function persist() {
    apc_store(get_class($this) . $this->id, serialize($this));
  }

  public static function restore($id) {
    return unserialize(apc_fetch(get_class($this) . $id));
  }
}

class MyClassB {
  public $_id;
  
  public function persist() {
    apc_store(get_class($this) . $this->id, serialize($this));
  }

  public static function restore($id) {
    return unserialize(apc_fetch(get_class($this) . $id));
  }
}