com.google.gwt.dev.ArchivePreloader Maven / Gradle / Ivy
/*
* Copyright 2011 Google Inc.
*
* 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.gwt.dev;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.dev.cfg.ModuleDef;
import com.google.gwt.dev.javac.CompilationStateBuilder;
import com.google.gwt.dev.javac.CompilationUnitArchive;
import com.google.gwt.dev.util.Util;
import com.google.gwt.dev.util.log.speedtracer.CompilerEventType;
import com.google.gwt.dev.util.log.speedtracer.SpeedTracerLogger;
import java.io.IOException;
import java.net.URL;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
/**
* Handles loading archived modules into the CompilationState for the Compiler
* and DevMode.
*/
public class ArchivePreloader {
static final boolean ARCHIVES_ENABLED = Boolean.valueOf(System.getProperty("gwt.usearchives",
"true"));
private static Map alreadyLoaded = new HashMap();
/**
* Load any .gwtar files into the cache before building CompilationState.
*/
static void preloadArchives(TreeLogger logger, ModuleDef module) {
if (!ArchivePreloader.ARCHIVES_ENABLED) {
return;
}
logger.log(TreeLogger.TRACE,
"Looking for precompiled archives. To disable, use -Dgwt.usearchives=false");
SpeedTracerLogger.Event loadArchive = SpeedTracerLogger.start(CompilerEventType.LOAD_ARCHIVE);
try {
Collection archiveURLs = module.getAllCompilationUnitArchiveURLs();
for (URL archiveURL : archiveURLs) {
Long lastModifiedTime = Util.getResourceModifiedTime(archiveURL);
String toLoad = archiveURL.toExternalForm();
Long previousLoadTime = alreadyLoaded.get(toLoad);
if (previousLoadTime == null || !previousLoadTime.equals(lastModifiedTime)) {
logger.log(TreeLogger.TRACE, "Loading archived module: " + archiveURL);
try {
CompilationUnitArchive archive = CompilationUnitArchive.createFromURL(archiveURL);
// Pre-populate CompilationStateBuilder with .gwtar files
CompilationStateBuilder.addArchive(archive);
} catch (IOException ex) {
logger.log(TreeLogger.WARN, "Unable to read: " + archiveURL + ". Skipping: " + ex);
} catch (ClassNotFoundException ex) {
logger.log(TreeLogger.WARN, "Incompatible archived module: " + archiveURL
+ ". Skipping: " + ex);
}
// Mark it loaded whether or not it worked. We don't want to continue
// to try and fail.
alreadyLoaded.put(toLoad, lastModifiedTime);
} else {
logger.log(TreeLogger.TRACE, "Skipping already loaded archive: " + archiveURL);
}
}
} finally {
loadArchive.end();
}
}
}