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Javet is Java + V8 (JAVa + V + EighT). It is an awesome way of embedding Node.js and V8 in Java.
/*
* Copyright (c) 2021-2024. caoccao.com Sam Cao
*
* 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.caoccao.javet.interop;
import com.caoccao.javet.annotations.CheckReturnValue;
import com.caoccao.javet.annotations.NodeModule;
import com.caoccao.javet.enums.JSRuntimeType;
import com.caoccao.javet.exceptions.JavetError;
import com.caoccao.javet.exceptions.JavetException;
import com.caoccao.javet.interop.options.RuntimeOptions;
import com.caoccao.javet.node.modules.INodeModule;
import com.caoccao.javet.node.modules.NodeModuleProcess;
import com.caoccao.javet.utils.JavetResourceUtils;
import com.caoccao.javet.values.reference.V8ValueFunction;
import com.caoccao.javet.values.reference.V8ValueObject;
import java.lang.reflect.Constructor;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
/**
* Node runtime is a thin wrapper over V8 runtime.
*
* @since 0.8.0
*/
@SuppressWarnings("unchecked")
public class NodeRuntime extends V8Runtime {
/**
* The constant FUNCTION_REQUIRE.
*
* @since 0.8.4
*/
public static final String FUNCTION_REQUIRE = "require";
/**
* The constant PROPERTY_DIRNAME.
*
* @since 0.8.4
*/
public static final String PROPERTY_DIRNAME = "__dirname";
/**
* The constant PROPERTY_FILENAME.
*
* @since 0.8.4
*/
public static final String PROPERTY_FILENAME = "__filename";
/**
* The Node module map.
*
* @since 0.8.1
*/
Map nodeModuleMap;
/**
* Instantiates a new Node runtime.
*
* @param v8Host the V8 host
* @param handle the handle
* @param pooled the pooled
* @param v8Native the V8 native
* @param runtimeOptions the runtime options
* @since 0.8.0
*/
NodeRuntime(V8Host v8Host, long handle, boolean pooled, IV8Native v8Native, RuntimeOptions runtimeOptions) {
super(v8Host, handle, pooled, v8Native, runtimeOptions);
nodeModuleMap = new HashMap<>();
}
@Override
public byte[] createSnapshot() throws JavetException {
throw new JavetException(JavetError.RuntimeCreateSnapshotDisabled);
}
@Override
public JSRuntimeType getJSRuntimeType() {
return JSRuntimeType.Node;
}
/**
* Gets node module.
*
* @param the type parameter
* @param nodeModuleClass the node module class
* @return the node module
* @throws JavetException the javet exception
* @since 0.8.1
*/
@CheckReturnValue
public Module getNodeModule(
Class nodeModuleClass) throws JavetException {
if (!nodeModuleClass.isAnnotationPresent(NodeModule.class)) {
return null;
}
NodeModule nodeModule = nodeModuleClass.getAnnotation(NodeModule.class);
return getNodeModule(nodeModule.name(), nodeModuleClass);
}
/**
* Gets node module.
*
* @param the type parameter
* @param name the name
* @param nodeModuleClass the node module class
* @return the node module
* @throws JavetException the javet exception
* @since 0.8.1
*/
@CheckReturnValue
public Module getNodeModule(
String name, Class nodeModuleClass) throws JavetException {
Objects.requireNonNull(name);
INodeModule nodeModule = null;
if (nodeModuleMap.containsKey(name)) {
nodeModule = nodeModuleMap.get(name);
} else {
V8ValueObject moduleObject;
if (nodeModuleClass == NodeModuleProcess.class) {
moduleObject = getGlobalObject().get(name);
} else {
try (V8ValueFunction requireFunction = getGlobalObject().get(FUNCTION_REQUIRE)) {
moduleObject = requireFunction.call(null, name);
}
}
try {
Constructor constructor = nodeModuleClass.getConstructor(
V8ValueObject.class, String.class);
nodeModule = constructor.newInstance(moduleObject, name);
nodeModuleMap.put(name, nodeModule);
} catch (Exception e) {
getLogger().logError(e, "Failed to create node module {0}.", name);
}
}
return (Module) nodeModule;
}
/**
* Gets node module count.
*
* @return the node module count
* @since 0.8.1
*/
public int getNodeModuleCount() {
return nodeModuleMap.size();
}
/**
* Is the event loop stopping.
*
* @return true : the event queue will be skipped while the Node.js runtime is being closed, false : regular behavior
* @since 3.1.4
*/
public boolean isStopping() {
return ((INodeNative) v8Native).isStopping(handle);
}
@Override
void removeAllReferences() throws JavetException {
removeNodeModules();
super.removeAllReferences();
}
/**
* Remove node module.
*
* @param iNodeModule the node module
* @throws JavetException the javet exception
* @since 0.8.1
*/
public void removeNodeModule(INodeModule iNodeModule) throws JavetException {
Objects.requireNonNull(iNodeModule);
if (nodeModuleMap.containsKey(iNodeModule.getName())) {
nodeModuleMap.remove(iNodeModule.getName());
iNodeModule.close();
}
}
/**
* Remove node modules.
*
* @since 0.8.1
*/
void removeNodeModules() {
if (!nodeModuleMap.isEmpty()) {
JavetResourceUtils.safeClose(nodeModuleMap.values());
nodeModuleMap.clear();
}
}
/**
* Sets the event loop stopping.
*
* @param stopping true : the event queue will be skipped while the Node.js runtime is being closed, false : regular behavior
* @since 3.1.4
*/
public void setStopping(boolean stopping) {
((INodeNative) v8Native).setStopping(handle, stopping);
}
}