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AbstractGraphvizEngine.java
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AbstractGraphvizEngine.java
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/*
* Copyright (C) 2015 Stefan Niederhauser (nidin@gmx.ch)
*
* 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 guru.nidi.graphviz.engine;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
public abstract class AbstractGraphvizEngine implements GraphvizEngine {
private final CountDownLatch state;
private final EngineInitListener engineInitListener;
private Exception initException;
public AbstractGraphvizEngine(boolean sync, EngineInitListener engineInitListener) {
state = new CountDownLatch(1);
this.engineInitListener = engineInitListener;
if (sync) {
init();
} else {
final Thread starter = new Thread(this::init);
starter.setDaemon(true);
starter.start();
}
}
public String execute(String src, Engine engine, Format format) {
if (initException != null) {
throw new GraphvizException("Could not start graphviz engine", initException);
}
try {
if (!state.await(60, TimeUnit.SECONDS)) {
throw new GraphvizException("Initializing graphviz engine took too long");
}
} catch (InterruptedException e) {
//ignore
}
return doExecute(src.startsWith("Viz(") ? src : vizExec(src, engine, format));
}
private void init() {
try {
doInit();
state.countDown();
} catch (Exception e) {
initException = e;
if (engineInitListener != null) {
engineInitListener.engineInitException(e);
}
}
}
@Override
public void release() {
}
protected abstract void doInit() throws Exception;
protected abstract String doExecute(String call);
protected String vizCode(String version) throws IOException {
try (final InputStream in = getClass().getResourceAsStream("/viz-" + version + ".js")) {
return IoUtils.readStream(in);
}
}
protected String initEnv() {
return "var $$prints=[], print=function(s){$$prints.push(s);};";
}
protected String vizExec(String src, Engine engine, Format format) {
return "Viz('" + jsEscape(src) + "',{format:'" + format.toString().toLowerCase() + "',engine:'" + engine.toString().toLowerCase() + "'});";
}
protected String jsEscape(String js) {
return js.replace("\n", " ").replace("\\", "\\\\").replace("'", "\\'");
}
}