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/*
* Copyright 2013-2017 Grzegorz Slowikowski (gslowikowski at gmail dot com)
*
* 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.
*/
package com.google.code.play2.plugin;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.ServiceLoader;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.resolver.ArtifactResolutionException;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Component;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.project.MavenProject;
import com.google.code.sbt.compiler.api.AnalysisProcessor;
import com.google.code.sbt.compiler.api.Compilers;
public abstract class AbstractPlay2EnhanceMojo
extends AbstractPlay2Mojo
{
/**
* Forced SBT version.
*
* Used to automatically select one of the "well known" SBT compilation analysis processors (if no SBT compiler
* added explicitly as plugin's dependency).
*
* There are two cases possible:
*
*
* If {@link #sbtVersion} is specified, {@link AnalysisProcessor} implementation compatible with that SBT version
* is selected.
*
*
* If {@link #sbtVersion} is not specified, {@link #playVersion} parameter value is used to indirectly select
* {@link AnalysisProcessor} implementation compatible with that Play! Framework version.
*
*
*
* @since 1.0.0
*/
@Parameter( property = "sbt.version" )
protected String sbtVersion;
/**
* List of artifacts this plugin depends on.
*/
@Parameter( property = "plugin.artifacts", required = true, readonly = true )
private List pluginArtifacts;
private static final String SBT_COMPILER_PLUGIN_GROUP_ID = "com.google.code.sbt-compiler-maven-plugin";
private static final String SBT_COMPILER_PLUGIN_API_ARTIFACT_ID = "sbt-compiler-api";
/**
* Map of SBT compiler implementations. For now only zero or one allowed.
*/
@Component( role = AnalysisProcessor.class )
private Map analysisProcessors;
// SBT compiler resolution for Analysis cache processing
// Cached classloaders
private static final ConcurrentHashMap SBT_COMPILER_CACHED_CLASS_LOADERS =
new ConcurrentHashMap( 2 );
private static ClassLoader getSbtCompilerCachedClassLoader( String compilerId )
{
return SBT_COMPILER_CACHED_CLASS_LOADERS.get( compilerId );
}
private static void setSbtCompilerCachedClassLoader( String compilerId, ClassLoader classLoader )
{
SBT_COMPILER_CACHED_CLASS_LOADERS.put( compilerId, classLoader );
}
protected AnalysisProcessor getSbtAnalysisProcessor()
throws MojoExecutionException
{
AnalysisProcessor sbtAnalysisProcessor = null;
if ( !analysisProcessors.isEmpty() )
{
sbtAnalysisProcessor = getDeclaredSbtAnalysisProcessor();
}
else
{
sbtAnalysisProcessor = getWellKnownSbtAnalysisProcessor();
}
return sbtAnalysisProcessor;
}
private AnalysisProcessor getDeclaredSbtAnalysisProcessor()
throws MojoExecutionException
{
if ( analysisProcessors.size() > 1 )
{
throw new MojoExecutionException( "Too many compilers defined. A maximum of one allowed." );
}
Map.Entry compilerEntry = analysisProcessors.entrySet().iterator().next();
String compilerId = compilerEntry.getKey();
AnalysisProcessor sbtAnalysisProcessor = compilerEntry.getValue();
getLog().debug( String.format( "Using declared compiler \"%s\".", compilerId ) );
return sbtAnalysisProcessor;
}
private AnalysisProcessor getWellKnownSbtAnalysisProcessor()
throws MojoExecutionException
{
try
{
String compilerId = Compilers.getDefaultCompilerId( sbtVersion, playVersion );
ClassLoader compilerClassLoader = getSbtCompilerCachedClassLoader( compilerId );
if ( compilerClassLoader == null )
{
getLog().debug( String.format( "Cached classloader for compiler \"%s\" not available.", compilerId ) );
}
else
{
if ( compilerClassLoader.getParent() == Thread.currentThread().getContextClassLoader() )
{
getLog().debug( String.format( "Using cached classloader for compiler \"%s\".", compilerId ) );
}
else
{
getLog().debug( String.format( "Invalidated cached classloader for compiler \"%s\". Parent classloader changed from %d to %d.",
compilerId,
Integer.valueOf( compilerClassLoader.getParent().hashCode() ),
Integer.valueOf( Thread.currentThread().getContextClassLoader().hashCode() ) ) );
compilerClassLoader = null;
}
}
if ( compilerClassLoader == null )
{
Set compilerArtifacts =
getResolvedArtifact( SBT_COMPILER_PLUGIN_GROUP_ID, "sbt-compiler-" + compilerId,
getSbtCompilerPluginVersion() );
List classPathFiles = new ArrayList( compilerArtifacts.size()/*compilerDependencies.size() + 2*/ );
for ( Artifact dependencyArtifact : compilerArtifacts/*compilerDependencies*/ )
{
classPathFiles.add( dependencyArtifact.getFile() );
}
List classPathUrls = new ArrayList( classPathFiles.size() );
for ( File classPathFile : classPathFiles )
{
classPathUrls.add( new URL( classPathFile.toURI().toASCIIString() ) );
}
compilerClassLoader =
new URLClassLoader( classPathUrls.toArray( new URL[classPathUrls.size()] ),
Thread.currentThread().getContextClassLoader() );
getLog().debug( String.format( "Setting cached classloader for compiler \"%s\" with parent classloader %d",
compilerId, Integer.valueOf( compilerClassLoader.getParent().hashCode() ) ) );
setSbtCompilerCachedClassLoader( compilerId, compilerClassLoader );
}
ServiceLoader analysisProcessorServiceLoader =
ServiceLoader.load( AnalysisProcessor.class, compilerClassLoader );
// get first (there should be exactly one)
AnalysisProcessor sbtAnalysisProcessor = analysisProcessorServiceLoader.iterator().next();
getLog().debug( String.format( "Using autodetected compiler \"%s\".", compilerId ) );
return sbtAnalysisProcessor;
}
catch ( ArtifactResolutionException e )
{
throw new MojoExecutionException( "Compiler autodetection failed", e );
}
catch ( MalformedURLException e )
{
throw new MojoExecutionException( "Compiler autodetection failed", e );
}
}
private String getSbtCompilerPluginVersion() throws MojoExecutionException
{
return getPluginArtifact( SBT_COMPILER_PLUGIN_GROUP_ID, SBT_COMPILER_PLUGIN_API_ARTIFACT_ID, "jar" ).getBaseVersion();
}
private/*protected*/ Artifact getPluginArtifact( String groupId, String artifactId, String type )
throws MojoExecutionException
{
Artifact result = null;
for ( Artifact artifact : pluginArtifacts )
{
if ( artifact.getGroupId().equals( groupId ) && artifact.getArtifactId().equals( artifactId )
&& type.equals( artifact.getType() ) )
{
result = artifact;
break;
}
}
if ( result == null )
{
throw new MojoExecutionException(
String.format( "Unable to locate '%s:%s' in the list of plugin artifacts",
groupId, artifactId ) );
}
return result;
}
private File defaultAnalysisCacheFile( MavenProject p )
{
File classesDirectory = new File( p.getBuild().getOutputDirectory() );
return new File( Compilers.getCacheDirectory( classesDirectory ), "compile" );
}
/**
* Returns SBT incremental main compilation analysis cache file location for a project.
*
* @return analysis cache file location
*/
protected File getAnalysisCacheFile()
{
return defaultAnalysisCacheFile( project );
}
}
