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From "Julian Reschke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OAK-3390) Avoid instanceof check in DocumentNodeStore
Date Thu, 10 Sep 2015 15:55:45 GMT

    [ https://issues.apache.org/jira/browse/OAK-3390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14738974#comment-14738974

Julian Reschke commented on OAK-3390:

Proposed interface:

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 * this work for additional information regarding copyright ownership.
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 * (the "License"); you may not use this file except in compliance with
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package org.apache.jackrabbit.oak.commons;

 * Identifies objects which can be adapted to other types or representations of the same object.
 * <p>
 * <em>Inspired by Apache Sling's Adaptable and Java SQL's Wrapper interfaces.</em>
public interface Adaptable {

     * Checks whether the adaptable can be converted to the specified type.
     * @param type
     *            The generic type to check for
     * @return {@code true} if a call to {link {@link #adaptTo(Class)}} is
     *         likely to succeed
    public boolean isAdaptable(Class<?> type);

     * Adapts the adaptable to another type.
     * <p>
     * Please note that it is explicitly left as an implementation detail
     * whether each call to this method with the same type yields the same
     * object or a new object on each call.
     * <p>
     * Implementations of this method should document their adapted types as
     * well as their behavior with respect to returning newly created or not
     * instance on each call.
     * @param <AdapterType>
     *            The generic type to which this object is adapted to
     * @param type
     *            The generic type to which this object is adapted to
     * @return The adapter target or {@code null} if the object cannot adapt to
     *         the requested type
    public <AdapterType> AdapterType adaptTo(Class<AdapterType> type);

> Avoid instanceof check in DocumentNodeStore
> -------------------------------------------
>                 Key: OAK-3390
>                 URL: https://issues.apache.org/jira/browse/OAK-3390
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core, mongomk
>    Affects Versions: 1.3.4
>            Reporter: Marcel Reutegger
>             Fix For: 1.3.7
> The instanceof MongoDocumentStore check does not work anymore when the store is wrapped
with e.g. the LeaseCheckDocumentStoreWrapper.

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