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index.js
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index.js
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//console.time("init");
var bindings = require('./build/Release/java.node');
//
initBinding();
//console.timeEnd("init");
// creates an java vm.
// We do not reinitialize a new vm if one has already been created and we losts its reference.
// And note that once a vm is destroyed, createVm becomes unstable, its behavior is vendor-specific.
var instance = null;
exports.createVm = function () {
if (instance)
return instance;
// Because JavaVMOption accepts zero-terminated cstring as its input, we must
// make sure that the input strings does not contain \0.
instance = new JavaVM(bindings.createVm(arguments.length, Array.prototype.join.call(arguments, '\0')));
bindings[0] = function (clsName, method) {
//console.log('invoke', clsName, method);
return instance.classCache[clsName].methods[method].apply(null, Array.prototype.slice.call(arguments, 2));
};
return instance;
};
function JavaVM(vm) {
this.vm = vm;
this.classCache = {};
}
var nextImplId = 0;
JavaVM.prototype = {
getClass: function (ptr, self) {
var arr = bindings.getClass(ptr, this.classCache, self),
className = arr[0],
handle = arr[1];
return handle ? this.classCache[className] = new JavaClass(className, handle) : this.classCache[className];
},
findClass: function (name) {
var classCache = this.classCache;
if (name in classCache) return classCache[name];
return classCache[name] = new JavaClass(name, bindings.findClass(this.vm, name));
},
runMain: function (cls, args) {
// cls is of form com/pkg/name/ClassName$SubClassName
bindings.runMain(this.vm, cls, args);
},
runMainAsync: function (cls, args) {
return bindings.runMain(this.vm, cls, args, true);
},
implement: function (parentName, interfaces, methods) {
if (typeof parentName === 'object') {
if (parentName instanceof Array) {
methods = interfaces;
interfaces = parentName;
} else {
methods = parentName;
interfaces = [];
}
parentName = 'java/lang/Object';
} else if (!(interfaces instanceof Array)) {
methods = interfaces;
interfaces = [];
}
var name = 'kyrios/Impl' + (nextImplId++).toString(36),
impl = require('./implement').build(name, parentName, interfaces, Object.keys(methods));
// require('fs').writeFileSync(name + '.class', new Buffer(new Uint8Array(impl.buffer)));
var handle = bindings.defineClass(this.vm, name, impl.buffer, impl.natives),
ret = instance.classCache[name] = new JavaClass(name, handle);
ret.methods = methods;
return ret;
},
destroy: function () {
bindings.dispose(this.vm);
this.vm = null;
}
};
function JavaClass(name, handle) {
this.name = name;
this.handle = handle;
this.methodCache = [{}, {}];
this.fieldCache = [{}, {}];
}
JavaClass.prototype = {
newInstance: function (signature) {
var method = findMethod(this, arguments.length ? '<init>(' + signature + ')V' : '<init>()V', false);
var ref = bindings.newInstance(this.handle, method, arguments);
return new JavaObject(ref, this);
},
invoke: invoker(true, false),
invokeAsync: invoker(true, true),
asObject: function () {
return new JavaObject(this.handle, null);
},
get: function (name, type) {
var field = findField(this, name, type, true);
return invokeFilter(bindings.get(this.handle, field));
},
set: function (name, type, value) {
var field = findField(this, name, type, true);
bindings.set(this.handle, field, value);
}
};
function invoker(isStatic, async) {
return async ? function (signature) {
var method = findMethod(isStatic ? this : this.getClass(), signature, isStatic);
return bindings.invokeAsync(this.handle, method, arguments).then(invokeFilter);
// passing `arguments' into c++ code is the most efficient way
} : function (signature) {
var method = findMethod(isStatic ? this : this.getClass(), signature, isStatic);
return invokeFilter(bindings.invoke(this.handle, method, arguments));
}
}
function invokeFilter(ret) {
if (ret !== null && typeof ret === 'object')
return new JavaObject(ret, null);
return ret;
}
function findMethod(cls, signature, isStatic) {
var methodCache = cls.methodCache[+isStatic];
if (signature in methodCache)
return methodCache[signature];
return methodCache[signature] = bindings.findMethod(cls.handle, signature, isStatic)
}
function findField(cls, name, type, isStatic) {
var fieldCache = cls.fieldCache[+isStatic],
signature = name + ':' + type;
if (signature in fieldCache)
return fieldCache[signature];
return fieldCache[signature] = bindings.findField(cls.handle, name, type, isStatic);
}
function parseArgs(args, types) {
var ret = [];
for (var i = 0, l = types.length; i < l; i++) {
var val = args[i + 1];
var type = types[i];
if (type === 'L') { // object
val = val && val.handle || null;
} else if (type === '$') { // string
// a java string maybe passed as a JavaObject
if (val) {
val = val.handle || String(val);
} else if (val === undefined) {
val = null;
}
}
ret[i] = val;
}
return ret;
}
function JavaObject(handle, cls) {
this.cls = cls;
this.handle = handle;
}
JavaObject.prototype = {
getClass: function () {
return this.cls || (this.cls = instance.getClass(this.handle, false));
},
invoke: invoker(false, false),
invokeAsync: invoker(false, true),
get: function (name, type) {
var field = findField(this.getClass(), name, type, false);
return invokeFilter(bindings.get(this.handle, field));
},
set: function (name, type, value) {
var field = findField(this.getClass(), name, type, false);
bindings.set(this.handle, field, value);
},
asClass: function () {
return instance.getClass(this.handle, true);
},
asObjectArray: function () {
return new JavaObjectArray(this.handle);
},
asBooleanArray: function () {
return new PrimitiveArray(this.handle, 'Z')
},
asByteArray: function () {
return new PrimitiveArray(this.handle, 'B')
},
asShortArray: function () {
return new PrimitiveArray(this.handle, 'S')
},
asCharArray: function () {
return new PrimitiveArray(this.handle, 'C')
},
asIntArray: function () {
return new PrimitiveArray(this.handle, 'I')
},
asFloatArray: function () {
return new PrimitiveArray(this.handle, 'F')
},
asLongArray: function () {
return new PrimitiveArray(this.handle, 'J')
},
asDoubleArray: function () {
return new PrimitiveArray(this.handle, 'D')
}
};
function PrimitiveArray(handle, type) {
this.handle = handle;
this.type = type.charCodeAt(0);
}
PrimitiveArray.prototype = {
get length() {
return bindings.getArrayLength(this.handle);
},
getRegion: function (start, end) {
return bindings.getPrimitiveArrayRegion(this.handle, start, end, this.type);
},
setRegion: function (buf, start, end) {
return bindings.setPrimitiveArrayRegion(this.handle, start, end, this.type, buf);
}
};
function JavaObjectArray(handle) {
this.handle = handle;
}
JavaObjectArray.prototype = {
get length() {
return bindings.getArrayLength(this.handle);
},
get: function (index) {
var handle = bindings.getObjectArrayItem(this.handle, index);
if (handle === null) {
return null;
}
return new JavaObject(handle, null);
},
set: function (index, val) {
var handle = typeof val === 'object' ? val ? val.handle : null : String(val);
bindings.setObjectArrayItem(this.handle, index, handle);
}
};
function initBinding(resolve, reject) {
var verbose = !!process.env.NODE_JAVA_VERBOSE;
var platform = process.platform, arch = process.arch;
var java_home = process.env.JAVA_HOME,
jre_home = process.env.JRE_HOME;
if(platform === 'win32') {
verbose && console.log('win32 does not need to load bindings dynamically');
return;
}
var fs = require('fs');
if(!java_home && !jre_home && platform === 'darwin') {
try {
java_home = ('' + require('child_process').execFileSync('/usr/libexec/java_home')).replace(/\n$/, '');
} catch(e) {
verbose && console.log('failed to find JAVA_HOME with command `/usr/libexec/java_home`: ' + e.message);
}
}
if (!java_home && !jre_home) {
throw new Error("neither JAVA_HOME nor JRE_HOME is found in environment variables");
}
switch (true) {
case platform === "linux" && arch === "x64" && java_home && test(java_home + "/jre/lib/amd64/server/libjvm.so"):
case platform === "linux" && arch === "x64" && jre_home && test(jre_home + "/lib/amd64/server/libjvm.so"):
case platform === "darwin" && java_home && test(java_home + "/jre/lib/server/libjvm.dylib"):
case platform === "darwin" && jre_home && test(jre_home + "/lib/server/libjvm.dylib"):
break;
default:
throw new Error("jvm shared library not found.");
}
function test(path) {
if (verbose) {
console.log('[INIT] testing jvm lib: ' + path);
}
if (fs.existsSync(path)) {
bindings.link(path, verbose);
return true;
}
if (verbose) {
console.log('[INIT] file not found: ' + path);
}
}
}