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/*
* LanguageTool, a natural language style checker
* * Copyright (C) 2018 Fabian Richter
* *
* * This library is free software; you can redistribute it and/or
* * modify it under the terms of the GNU Lesser General Public
* * License as published by the Free Software Foundation; either
* * version 2.1 of the License, or (at your option) any later version.
* *
* * This library is distributed in the hope that it will be useful,
* * but WITHOUT ANY WARRANTY; without even the implied warranty of
* * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* * Lesser General Public License for more details.
* *
* * You should have received a copy of the GNU Lesser General Public
* * License along with this library; if not, write to the Free Software
* * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* * USA
*
*/
package org.languagetool.server;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.languagetool.JLanguageTool;
import org.languagetool.Language;
import org.languagetool.ResultCache;
import org.languagetool.UserConfig;
import org.languagetool.gui.Configuration;
import org.languagetool.tools.Tools;
import java.io.IOException;
import java.util.HashSet;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Caches pre-configured JLanguageTool instances to avoid costly setup time of rules, etc.
* TODO: reimplement using apache commons KeyedObjectPool
*/
class PipelinePool {
static final long PIPELINE_EXPIRE_TIME = 15 * 60 * 1000;
public static class PipelineSettings {
private final Language lang;
private final Language motherTongue;
private final TextChecker.QueryParams query;
private final UserConfig user;
PipelineSettings(Language lang, Language motherTongue, TextChecker.QueryParams params, UserConfig userConfig) {
this.lang = lang;
this.motherTongue = motherTongue;
this.query = params;
this.user = userConfig;
}
@Override
public int hashCode() {
return new HashCodeBuilder(17, 31)
.append(lang)
.append(motherTongue)
.append(query)
.append(user)
.toHashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == this) return true;
if (obj == null || getClass() != obj.getClass()) {
return false;
}
PipelineSettings other = (PipelineSettings) obj;
return new EqualsBuilder()
.append(lang, other.lang)
.append(motherTongue, other.motherTongue)
.append(query, other.query)
.append(user, other.user)
.isEquals();
}
@Override
public String toString() {
return new ToStringBuilder(this)
.append("lang", lang)
.append("motherTongue", motherTongue)
.append("query", query)
.append("user", user)
.build();
}
}
private final HTTPServerConfig config;
private final ResultCache cache;
private final LoadingCache> pool;
private final boolean internalServer;
private long pipelineExpireCheckTimestamp;
// stats
private long pipelinesUsed;
private long requests;
PipelinePool(HTTPServerConfig config, ResultCache cache, boolean internalServer) {
this.internalServer = internalServer;
this.config = config;
this.cache = cache;
this.pipelineExpireCheckTimestamp = System.currentTimeMillis();
int maxPoolSize = config.getMaxPipelinePoolSize();
int expireTime = config.getPipelineExpireTime();
if (config.isPipelineCachingEnabled()) {
this.pool = CacheBuilder.newBuilder()
.maximumSize(maxPoolSize)
.expireAfterAccess(expireTime, TimeUnit.SECONDS)
.build(new CacheLoader>() {
@Override
public ConcurrentLinkedQueue load(PipelineSettings key) {
return new ConcurrentLinkedQueue<>();
}
});
} else {
this.pool = null;
}
}
Pipeline getPipeline(PipelineSettings settings) throws Exception {
if (pool != null) {
// expire old pipelines in queues (where settings may be used, but some of the created pipelines are unused)
long expireCheckDelta = System.currentTimeMillis() - pipelineExpireCheckTimestamp;
if (expireCheckDelta > PIPELINE_EXPIRE_TIME) {
AtomicInteger removed = new AtomicInteger();
pipelineExpireCheckTimestamp = System.currentTimeMillis();
//pool.asMap().forEach((s, queue) -> queue.removeIf(Pipeline::isExpired));
pool.asMap().forEach((s, queue) -> queue.removeIf(pipeline -> {
if (pipeline.isExpired()) {
removed.getAndIncrement();
return true;
} else {
return false;
}
}));
ServerTools.print("Removing " + removed.get() + " expired pipelines");
}
requests++;
ConcurrentLinkedQueue pipelines = pool.get(settings);
if (requests % 1000 == 0) {
ServerTools.print(String.format("Pipeline cache stats: %f hit rate", (double) pipelinesUsed / requests));
}
Pipeline pipeline = pipelines.poll();
if (pipeline == null) {
//ServerTools.print(String.format("No prepared pipeline found for %s; creating one.", settings));
pipeline = createPipeline(settings.lang, settings.motherTongue, settings.query, settings.user);
} else {
pipelinesUsed++;
//ServerTools.print(String.format("Prepared pipeline found for %s; using it.", settings));
}
return pipeline;
} else {
return createPipeline(settings.lang, settings.motherTongue, settings.query, settings.user);
}
}
void returnPipeline(PipelineSettings settings, Pipeline pipeline) throws ExecutionException {
if (pool == null) return;
ConcurrentLinkedQueue pipelines = pool.get(settings);
pipeline.refreshExpireTimer();
pipelines.add(pipeline);
}
/**
* Create a JLanguageTool instance for a specific language, mother tongue, and rule configuration.
* Uses Pipeline wrapper to safely share objects
*
* @param lang the language to be used
* @param motherTongue the user's mother tongue or {@code null}
*/
Pipeline createPipeline(Language lang, Language motherTongue, TextChecker.QueryParams params, UserConfig userConfig)
throws Exception { // package-private for mocking
Pipeline lt = new Pipeline(lang, params.altLanguages, motherTongue, cache, userConfig);
lt.setMaxErrorsPerWordRate(config.getMaxErrorsPerWordRate());
if (config.getLanguageModelDir() != null) {
lt.activateLanguageModelRules(config.getLanguageModelDir());
}
if (config.getWord2VecModelDir () != null) {
lt.activateWord2VecModelRules(config.getWord2VecModelDir());
}
if (config.getRulesConfigFile() != null) {
configureFromRulesFile(lt, lang);
} else {
configureFromGUI(lt, lang);
}
if (params.useQuerySettings) {
Tools.selectRules(lt, new HashSet<>(params.disabledCategories), new HashSet<>(params.enabledCategories),
new HashSet<>(params.disabledRules), new HashSet<>(params.enabledRules), params.useEnabledOnly);
}
if (pool != null) {
lt.setupFinished();
}
return lt;
}
private void configureFromRulesFile(JLanguageTool langTool, Language lang) throws IOException {
ServerTools.print("Using options configured in " + config.getRulesConfigFile());
// If we are explicitly configuring from rules, ignore the useGUIConfig flag
if (config.getRulesConfigFile() != null) {
org.languagetool.gui.Tools.configureFromRules(langTool, new Configuration(config.getRulesConfigFile()
.getCanonicalFile().getParentFile(), config.getRulesConfigFile().getName(), lang));
} else {
throw new RuntimeException("config.getRulesConfigFile() is null");
}
}
private void configureFromGUI(JLanguageTool langTool, Language lang) throws IOException {
Configuration config = new Configuration(lang);
if (internalServer && config.getUseGUIConfig()) {
ServerTools.print("Using options configured in the GUI");
org.languagetool.gui.Tools.configureFromRules(langTool, config);
}
}
}
