<?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>ContextSampler.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">TheseFoolishThings :: Examples :: DCI :: Displayable</a> > <a href="../index.html" class="el_bundle">it-tidalwave-role</a> > <a href="index.source.html" class="el_package">it.tidalwave.role.spi</a> > <span class="el_source">ContextSampler.java</span></div><h1>ContextSampler.java</h1><pre class="source lang-java linenums">/*
* *********************************************************************************************************************
*
* TheseFoolishThings: Miscellaneous utilities
* http://tidalwave.it/projects/thesefoolishthings
*
* Copyright (C) 2009 - 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/thesefoolishthings-src
* git clone https://github.com/tidalwave-it/thesefoolishthings-src
*
* *********************************************************************************************************************
*/
package it.tidalwave.role.spi;
import javax.annotation.Nonnull;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import it.tidalwave.util.Task;
import it.tidalwave.role.ContextManager;
import lombok.ToString;
import lombok.extern.slf4j.Slf4j;
import static it.tidalwave.role.spi.impl.LogUtil.*;
/***********************************************************************************************************************
*
* A facility that samples the contexts that are current at creation time and make them available later.
*
* @author Fabrizio Giudici
*
**********************************************************************************************************************/
<span class="fc" id="L46">@Slf4j @ToString(of = "contexts")</span>
public class ContextSampler
{
// TODO: should be weak references? Should a context be alive as soon as all the objects created with it are
should be weak references? Should a context be alive as soon as all the objects created with it are
// alive?
private final List<Object> contexts;
// No @Inject here, we don't want to depend on a DI framework
<span class="fc" id="L54"> private final ContextManager contextManager = ContextManager.Locator.find();</span>
/*******************************************************************************************************************
*
* Creates a new instance and samples the currently available contexts.
*
* @param owner the owner
*
******************************************************************************************************************/
public ContextSampler (@Nonnull final Object owner)
<span class="fc" id="L64"> {</span>
<span class="fc" id="L65"> contexts = Collections.unmodifiableList(contextManager.getContexts());</span>
<span class="pc bpc" id="L67" title="1 of 2 branches missed."> if (log.isTraceEnabled())</span>
{
<span class="fc" id="L69"> log.trace(">>>> contexts for {} at construction time: {}", shortId(owner), shortIds(contexts));</span>
}
<span class="fc" id="L71"> }</span>
/*******************************************************************************************************************
*
* Returns the previously sampled contexts.
*
* @return the contexts
*
******************************************************************************************************************/
@Nonnull
public List<Object> getContexts()
{
<span class="fc" id="L83"> return new CopyOnWriteArrayList<>(contexts);</span>
}
/*******************************************************************************************************************
*
* Runs a {@link Task} associated with the sampled contexts.
*
* @param <V> the type of the result value
* @param <T> the type of the exception
* @param task the task
* @return the value produced by the task
* @throws T the exception(s) thrown by the task
*
******************************************************************************************************************/
public <V, T extends Throwable> V runWithContexts (@Nonnull final Task<V, T> task)
throws T
{
<span class="fc" id="L100"> return contextManager.runWithContexts(contexts, task);</span>
}
}
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