GremlinGroovyScriptEngine (Apache TinkerPop 3.1.1-incubating API)

java.lang.Object
- GroovyScriptEngineImpl
- - org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine

All Implemented Interfaces:

AutoCloseable, DependencyManager
```
public class GremlinGroovyScriptEngine
extends GroovyScriptEngineImpl
implements DependencyManager, AutoCloseable
```
Provides methods to compile and evaluate Gremlin scripts. Compiled scripts are stored in a managed cache to cut down on compilation times of future evaluations of the same script. This ScriptEngine implementation is heavily adapted from the GroovyScriptEngineImpl to include some additional functionality.

Author:

Marko A. Rodriguez (http://markorodriguez.com), Stephen Mallette (http://stephen.genoprime.com)

See Also:

GremlinExecutor

Field Summary

Fields
Modifier and Type	Field and Description
`static ThreadLocal<Map<String,Object>>`	`COMPILE_OPTIONS`
`static String`	`COMPILE_OPTIONS_VAR_TYPES` An "internal" key for sandboxing the script engine - technically not for public use.
`static String`	`KEY_REFERENCE_TYPE` The attribute key (passed as a binding on the context) for how to cache scripts.
`static String`	`REFERENCE_TYPE_HARD` A value to the `KEY_REFERENCE_TYPE` that makes the evaluated script available in the cache for the life of the JVM.
`static String`	`REFERENCE_TYPE_PHANTOM` A value to the `KEY_REFERENCE_TYPE` that immediately garbage collects the script after evaluation.
`static String`	`REFERENCE_TYPE_SOFT` A value to the `KEY_REFERENCE_TYPE` that retains the script until memory is "low" and therefore should be reclaimed before an `OutOfMemoryError` occurs.
`static String`	`REFERENCE_TYPE_WEAK` A value to the `KEY_REFERENCE_TYPE` that marks the script as one that can be garbage collected even when memory is abundant.

Constructor Summary

Constructors
Constructor and Description
`GremlinGroovyScriptEngine()` Creates a new instance using the `DefaultImportCustomizerProvider`.
`GremlinGroovyScriptEngine(CompilerCustomizerProvider... compilerCustomizerProviders)` Creates a new instance with the specified `CompilerCustomizerProvider` objects.
`GremlinGroovyScriptEngine(ImportCustomizerProvider importCustomizerProvider)` Deprecated. As of release 3.0.1, replaced by `GremlinGroovyScriptEngine(CompilerCustomizerProvider...)`

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`void`	`addImports(Set<String> importStatements)` Perform class imports for the ScriptEngine.
`void`	`close()`
`CompiledScript`	`compile(Reader reader)`
`CompiledScript`	`compile(String scriptSource)`
`Bindings`	`createBindings()` Create bindings to be used by this `ScriptEngine`.
`Map[]`	`dependencies()` List the dependencies in the ScriptEngine classloader.
`Object`	`eval(Reader reader, ScriptContext context)`
`Object`	`eval(String script, ScriptContext context)`
`ScriptEngineFactory`	`getFactory()`
`<T> T`	`getInterface(Class<T> clazz)`
`<T> T`	`getInterface(Object thiz, Class<T> clazz)`
`protected ClassLoader`	`getParentLoader()`
`Set`	`getPlugins()` Get the list of loaded plugins.
`Map<String,Set<String>>`	`imports()` List the imports in the ScriptEngine;
`Object`	`invokeFunction(String name, Object... args)`
`Object`	`invokeMethod(Object thiz, String name, Object... args)`
`void`	`loadPlugins(List<GremlinPlugin> plugins)` Load a list of `GremlinPlugin` instances.
`Set`	`plugins()` Deprecated. As of release 3.0.1, replaced by `getPlugins()`
`void`	`reset()` Reset the ScriptEngine.
`List<GremlinPlugin>`	`use(String group, String artifact, String version)` Take maven coordinates and load the classes into the classloader used by the ScriptEngine.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - COMPILE_OPTIONS_VAR_TYPES
```
public static final String COMPILE_OPTIONS_VAR_TYPES
```
    An "internal" key for sandboxing the script engine - technically not for public use.
    
    See Also:
    
    Constant Field Values
  - KEY_REFERENCE_TYPE
```
public static final String KEY_REFERENCE_TYPE
```
    The attribute key (passed as a binding on the context) for how to cache scripts. The value must be one of the following:
    See Also:
    
    Constant Field Values
  - REFERENCE_TYPE_PHANTOM
```
public static final String REFERENCE_TYPE_PHANTOM
```
    A value to the KEY_REFERENCE_TYPE that immediately garbage collects the script after evaluation.
    
    See Also:
    
    Constant Field Values
  - REFERENCE_TYPE_WEAK
```
public static final String REFERENCE_TYPE_WEAK
```
    A value to the KEY_REFERENCE_TYPE that marks the script as one that can be garbage collected even when memory is abundant.
    
    See Also:
    
    Constant Field Values
  - REFERENCE_TYPE_SOFT
```
public static final String REFERENCE_TYPE_SOFT
```
    A value to the KEY_REFERENCE_TYPE that retains the script until memory is "low" and therefore should be reclaimed before an OutOfMemoryError occurs.
    
    See Also:
    
    Constant Field Values
  - REFERENCE_TYPE_HARD
```
public static final String REFERENCE_TYPE_HARD
```
    A value to the KEY_REFERENCE_TYPE that makes the evaluated script available in the cache for the life of the JVM.
    
    See Also:
    
    Constant Field Values
  - COMPILE_OPTIONS
```
public static final ThreadLocal<Map<String,Object>> COMPILE_OPTIONS
```
- Constructor Detail
  - GremlinGroovyScriptEngine
```
public GremlinGroovyScriptEngine()
```
    Creates a new instance using the DefaultImportCustomizerProvider.
  - GremlinGroovyScriptEngine
```
@Deprecated
public GremlinGroovyScriptEngine(ImportCustomizerProvider importCustomizerProvider)
```
    Deprecated. As of release 3.0.1, replaced by GremlinGroovyScriptEngine(CompilerCustomizerProvider...)
  - GremlinGroovyScriptEngine
```
public GremlinGroovyScriptEngine(CompilerCustomizerProvider... compilerCustomizerProviders)
```
    Creates a new instance with the specified CompilerCustomizerProvider objects.
- Method Detail
  - use
```
public List<GremlinPlugin> use(String group,
                               String artifact,
                               String version)
```
    Take maven coordinates and load the classes into the classloader used by the ScriptEngine. Those ScriptEngines that can support script engine plugins should check if there are any new GremlinPlugin implementations in the classloader. The GremlinGroovyScriptEngine implementation uses ServiceLoader to figure out if there are such classes to return.
    It is up to the caller to execute the GremlinPlugin.pluginTo(org.apache.tinkerpop.gremlin.groovy.plugin.PluginAcceptor) method. The reason for this has to do with conflicts that can occur with mapper imports that are added via the ImportCustomizerProvider and scripts executed through the PluginAcceptor. Generally speaking, all calls to this "use" method should be complete prior to calling GremlinPlugin.pluginTo(PluginAcceptor).
    This method should be called after "expected" imports have been added to the DependencyManager because adding imports with addImports(java.util.Set) will reset the classloader and flush away dependencies.
    
    Specified by:
    
    use in interface DependencyManager
  - loadPlugins
```
public void loadPlugins(List<GremlinPlugin> plugins)
                 throws GremlinPluginException
```
    Load a list of GremlinPlugin instances. These plugins are typically returned from calls to DependencyManager.use(String, String, String).
    
    Specified by:
    
    loadPlugins in interface DependencyManager
    
    Throws:
    
    GremlinPluginException - if there is a problem loading the plugin itself.
  - dependencies
```
public Map[] dependencies()
```
    List the dependencies in the ScriptEngine classloader.
    
    Specified by:
    
    dependencies in interface DependencyManager
  - imports
```
public Map<String,Set<String>> imports()
```
    List the imports in the ScriptEngine;
    
    Specified by:
    
    imports in interface DependencyManager
  - addImports
```
public void addImports(Set<String> importStatements)
```
    Perform class imports for the ScriptEngine.
    
    Specified by:
    
    addImports in interface DependencyManager
  - plugins
```
@Deprecated
public Set plugins()
```
    Deprecated. As of release 3.0.1, replaced by getPlugins()
    
    Get the list of loaded plugins.
  - getPlugins
```
public Set getPlugins()
```
    Get the list of loaded plugins.
  - close
```
public void close()
           throws Exception
```
    Specified by:
    
    close in interface AutoCloseable
    
    Throws:
    
    Exception
  - reset
```
public void reset()
```
    Reset the ScriptEngine. Clear caches and kill the classloader.
    
    Specified by:
    
    reset in interface DependencyManager
  - eval
```
public Object eval(Reader reader,
                   ScriptContext context)
            throws ScriptException
```
    Throws:
    
    ScriptException
  - eval
```
public Object eval(String script,
                   ScriptContext context)
            throws ScriptException
```
    Throws:
    
    ScriptException
  - createBindings
```
public Bindings createBindings()
```
    Create bindings to be used by this ScriptEngine. In this case, SimpleBindings are returned.
  - getFactory
```
public ScriptEngineFactory getFactory()
```
  - compile
```
public CompiledScript compile(String scriptSource)
                       throws ScriptException
```
    Throws:
    
    ScriptException
  - compile
```
public CompiledScript compile(Reader reader)
                       throws ScriptException
```
    Throws:
    
    ScriptException
  - invokeFunction
```
public Object invokeFunction(String name,
                             Object... args)
                      throws ScriptException,
                             NoSuchMethodException
```
    Throws:
    
    ScriptException
    
    NoSuchMethodException
  - invokeMethod
```
public Object invokeMethod(Object thiz,
                           String name,
                           Object... args)
                    throws ScriptException,
                           NoSuchMethodException
```
    Throws:
    
    ScriptException
    
    NoSuchMethodException
  - getInterface
```
public <T> T getInterface(Class<T> clazz)
```
  - getInterface
```
public <T> T getInterface(Object thiz,
                          Class<T> clazz)
```
  - getParentLoader
```
protected ClassLoader getParentLoader()
```

Class GremlinGroovyScriptEngine

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

COMPILE_OPTIONS_VAR_TYPES

KEY_REFERENCE_TYPE

REFERENCE_TYPE_PHANTOM

REFERENCE_TYPE_WEAK

REFERENCE_TYPE_SOFT

REFERENCE_TYPE_HARD

COMPILE_OPTIONS

Constructor Detail

GremlinGroovyScriptEngine

GremlinGroovyScriptEngine

GremlinGroovyScriptEngine

Method Detail

use

loadPlugins

dependencies

imports

addImports

plugins

getPlugins

close

reset

eval

eval

createBindings

getFactory

compile

compile

invokeFunction

invokeMethod

getInterface

getInterface

getParentLoader