<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" lang="en"><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/><link rel="stylesheet" href="../../jacoco-resources/report.css" type="text/css"/><link rel="shortcut icon" href="../../jacoco-resources/report.gif" type="image/gif"/><title>ImageModelCache.java</title><link rel="stylesheet" href="../../jacoco-resources/prettify.css" type="text/css"/><script type="text/javascript" src="../../jacoco-resources/prettify.js"></script></head><body onload="window['PR_TAB_WIDTH']=4;prettyPrint()"><div class="breadcrumb" id="breadcrumb"><span class="info"><a href="../../jacoco-sessions.html" class="el_session">Sessions</a></span><a href="../../index.html" class="el_report">Mistral Operations</a> > <a href="../index.html" class="el_bundle">image-core</a> > <a href="index.source.html" class="el_package">it.tidalwave.image</a> > <span class="el_source">ImageModelCache.java</span></div><h1>ImageModelCache.java</h1><pre class="source lang-java linenums">/*
* *********************************************************************************************************************
*
* Mistral: open source imaging engine
* http://tidalwave.it/projects/mistral
*
* Copyright (C) 2003 - 2023 by Tidalwave s.a.s. (http://tidalwave.it)
*
* *********************************************************************************************************************
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
*
* *********************************************************************************************************************
*
* git clone https://bitbucket.org/tidalwave/mistral-src
* git clone https://github.com/tidalwave-it/mistral-src
*
* *********************************************************************************************************************
*/
package it.tidalwave.image;
import java.io.Serializable;
/***********************************************************************************************************************
*
* A cache of ImageModels used for distributed computing. The purpose of the
* cache is - quite obviously - to reduce the need for moving image through the
* network among different computing nodes.
*
* @author Fabrizio Giudici
*
**********************************************************************************************************************/
public abstract class ImageModelCache
{
/**
* The default class.
*/
<span class="fc" id="L45"> private static Class<? extends ImageModelCache> defaultClass = DefaultImageModelCache.class;</span>
/**
* The singleton instance.
*/
private static ImageModelCache instance;
/*******************************************************************************************************************
*
*
******************************************************************************************************************/
protected ImageModelCache()
<span class="fc" id="L57"> {</span>
<span class="fc" id="L58"> }</span>
/*******************************************************************************************************************
*
* Sets the default implementation of the cache for the local VM.
*
* @param defaultClass the implementation class
* @throws IllegalStateException if a cache has been already instantiated
*
******************************************************************************************************************/
public static void setDefault (final Class<? extends ImageModelCache> defaultClass)
{
// if (instance != null)
// {
// throw new IllegalStateException("A local cache has been already instantiated");
// }
<span class="nc" id="L75"> ImageModelCache.defaultClass = defaultClass;</span>
<span class="nc" id="L76"> instance = null;</span>
<span class="nc" id="L77"> }</span>
/*******************************************************************************************************************
*
* Returns the default instance of the cache on the local VM.
*
* @return the local cache
*
******************************************************************************************************************/
public static synchronized ImageModelCache getInstance() // FIXME: rename to getDefault(), it's no more a singleton
{
try
{
<span class="fc bfc" id="L90" title="All 2 branches covered."> if (instance == null)</span>
{
<span class="fc" id="L92"> instance = defaultClass.newInstance();</span>
}
<span class="fc" id="L95"> return instance;</span>
}
<span class="nc" id="L97"> catch (Exception e)</span>
{
<span class="nc" id="L99"> throw new RuntimeException(e);</span>
}
}
/*******************************************************************************************************************
*
* Adds an ImageModel to the cache. The image is always added only in the
* local cache. Remote caches will pull the images they lack on demand.
*
* @param imageModel the ImageModel to add
*
******************************************************************************************************************/
public abstract void store (ImageModel imageModel);
/*******************************************************************************************************************
*
* Updates an ImageModel in the cache. This means that all remote copies of
* this image will be invalidated.
*
* TODO: should investigate more complex cases. Maybe the remote workers
should investigate more complex cases. Maybe the remote workers
* still want to work with a remote snapshot. Include versioning instead of
* invalidating?
*
* @param imageModel the ImageModel to update
*
******************************************************************************************************************/
public abstract void update (ImageModel imageModel);
/*******************************************************************************************************************
*
* Removes an ImageModel from the cache. According to the value of the
* <code>remote</code> parameter, the operation is performed only locally
* or also to remote caches.
*
* @param id the id of the ImageModel to remove
* @param remove true if the operation must be performed also remotely
*
******************************************************************************************************************/
public abstract void remove (Serializable id, boolean remote);
/*******************************************************************************************************************
*
* Finds an ImageModel in the cache. According to the value of the
* <code>remote</code> parameter, the search is performed only locally
* or also to remote caches.
*
* @param id the id of the ImageModel to remove
* @param remove true if the operation must be performed also remotely
*
******************************************************************************************************************/
public abstract ImageModel retrieve (Serializable id, boolean remote);
/*******************************************************************************************************************
*
* Returns true if there's a local copy with the given id.
*
* @param id the id of the ImageModel to remove
* @return true if there's a local copy
*
******************************************************************************************************************/
public abstract boolean contains (Serializable id);
}
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