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Jsh.java
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Jsh.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.camel.k.loader.jsh;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import javax.script.ScriptException;
import jdk.jshell.JShell;
import jdk.jshell.Snippet;
import jdk.jshell.SnippetEvent;
import jdk.jshell.SourceCodeAnalysis;
import jdk.jshell.spi.ExecutionControl;
import jdk.jshell.spi.ExecutionControlProvider;
import jdk.jshell.spi.ExecutionEnv;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class Jsh {
private static final Logger LOGGER = LoggerFactory.getLogger(Jsh.class);
private static final ThreadLocal<Map<String, Object>> BINDINGS = ThreadLocal.withInitial(ConcurrentHashMap::new);
private Jsh() {
// no-op
}
public static List<String> compile(JShell jshell, String script) throws ScriptException {
List<String> snippets = new ArrayList<>();
while (!script.isEmpty()) {
SourceCodeAnalysis.CompletionInfo ci = jshell.sourceCodeAnalysis().analyzeCompletion(script);
if (!ci.completeness().isComplete()) {
throw new ScriptException("Incomplete script:\n" + script);
}
snippets.add(ci.source());
script = ci.remaining();
}
return snippets;
}
public static void setBinding(JShell jshell, String name, Object value) throws ScriptException {
ObjectHelper.notNull(jshell, "jshell");
ObjectHelper.notNull(name, "name");
ObjectHelper.notNull(value, "value");
setBinding(jshell, name, value, value.getClass());
}
public static <T> void setBinding(JShell jshell, String name, T value, Class<? extends T> type) throws ScriptException {
ObjectHelper.notNull(jshell, "jshell");
ObjectHelper.notNull(name, "name");
ObjectHelper.notNull(value, "value");
ObjectHelper.notNull(type, "type");
setBinding(name, value);
// As JShell leverages LocalExecutionControl as execution engine and thus JShell
// runs in the current process it is possible to access to local classes, we use
// such capability to inject bindings as variables.
String snippet = String.format(
"var %s = %s.getBinding(\"%s\", %s.class);",
name,
Jsh.class.getName(),
name,
type.getName());
eval(jshell, snippet);
}
public static Object getBinding(String name) {
return BINDINGS.get().get(name);
}
public static <T> T getBinding(String name, Class<T> type) {
Object answer = BINDINGS.get().get(name);
return answer != null ? type.cast(answer) : null;
}
public static void setBinding(String name, Object value) {
BINDINGS.get().put(name, value);
}
public static void clearBindings() {
BINDINGS.get().clear();
}
public static void eval(JShell jshell, String snippet) throws ScriptException {
LOGGER.debug("Evaluating {}", snippet);
List<SnippetEvent> events = jshell.eval(snippet);
for (SnippetEvent event : events) {
if (event.exception() != null) {
throw new ScriptException(event.exception());
}
if (event.status() != Snippet.Status.VALID) {
throw new ScriptException("Error evaluating snippet:\n" + event.snippet().source());
}
}
}
public static ExecutionControlProvider wrapExecutionControl(String name, ExecutionControl delegate) {
return new ExecutionControlProvider() {
@Override
public String name() {
return name;
}
@Override
public ExecutionControl generate(ExecutionEnv env, Map<String, String> parameters) throws Throwable {
return delegate;
}
};
}
}