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Diffstat (limited to 'sca-java-1.x/branches/sca-java-0.90/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementationProvider.java')
-rw-r--r-- | sca-java-1.x/branches/sca-java-0.90/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementationProvider.java | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/sca-java-1.x/branches/sca-java-0.90/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementationProvider.java b/sca-java-1.x/branches/sca-java-0.90/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementationProvider.java new file mode 100644 index 0000000000..b15247033b --- /dev/null +++ b/sca-java-1.x/branches/sca-java-0.90/modules/implementation-script/src/main/java/org/apache/tuscany/sca/implementation/script/ScriptImplementationProvider.java @@ -0,0 +1,119 @@ +/* + * 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.tuscany.sca.implementation.script; + +import java.io.StringReader; + +import javax.script.Invocable; +import javax.script.ScriptEngine; +import javax.script.ScriptEngineManager; +import javax.script.ScriptException; + +import org.apache.tuscany.implementation.spi.PropertyValueObjectFactory; +import org.apache.tuscany.sca.assembly.ComponentReference; +import org.apache.tuscany.sca.assembly.Property; +import org.apache.tuscany.sca.assembly.Reference; +import org.apache.tuscany.sca.factory.ObjectCreationException; +import org.apache.tuscany.sca.factory.ObjectFactory; +import org.apache.tuscany.sca.implementation.script.engines.TuscanyJRubyScriptEngine; +import org.apache.tuscany.sca.interfacedef.Operation; +import org.apache.tuscany.sca.interfacedef.java.JavaInterface; +import org.apache.tuscany.sca.invocation.Invoker; +import org.apache.tuscany.sca.provider.ImplementationProvider; +import org.apache.tuscany.sca.runtime.RuntimeComponent; +import org.apache.tuscany.sca.runtime.RuntimeComponentService; + +/** + * Represents a Script implementation. + */ +public class ScriptImplementationProvider implements ImplementationProvider { + + protected RuntimeComponent component; + protected ScriptImplementation implementation; + protected ScriptEngine scriptEngine; + protected PropertyValueObjectFactory propertyFactory; + + public ScriptImplementationProvider(RuntimeComponent component, ScriptImplementation implementation, PropertyValueObjectFactory propertyFactory) { + this.component = component; + this.implementation = implementation; + this.propertyFactory = propertyFactory; + } + + public Invoker createInvoker(RuntimeComponentService service, Operation operation) { + return new ScriptInvoker(this, operation.getName()); + } + + public Invoker createCallbackInvoker(Operation operation) { + return new ScriptInvoker(this, operation.getName()); + } + + public void start() { + try { + scriptEngine = getScriptEngineByExtension(implementation.getScriptLanguage()); + if (scriptEngine == null) { + throw new ObjectCreationException("no script engine found for language: " + implementation.getScriptLanguage()); + } + if (!(scriptEngine instanceof Invocable)) { + throw new ObjectCreationException("script engine does not support Invocable: " + scriptEngine); + } + + for (Reference reference : implementation.getReferences()) { + scriptEngine.put(reference.getName(), createReferenceProxy(reference.getName(), component)); + } + + for (Property property : implementation.getProperties()) { + ObjectFactory<?> propertyValueFactory = propertyFactory.createValueFactory(property); + if ( propertyValueFactory != null) { + scriptEngine.put(property.getName(), propertyValueFactory.getInstance()); + } + } + + scriptEngine.eval(new StringReader(implementation.getScriptSrc())); + + } catch (ScriptException e) { + throw new ObjectCreationException(e); + } + } + + public void stop() { + } + + @SuppressWarnings("unchecked") + protected Object createReferenceProxy(String name, RuntimeComponent component) { + for (ComponentReference reference : component.getReferences()) { + if (reference.getName().equals(name)) { + Class iface = ((JavaInterface)reference.getInterfaceContract().getInterface()).getJavaClass(); + return component.getService(iface, name); + } + } + throw new IllegalArgumentException("reference " + name + " not found on component: " + component); + } + + /** + * Hack for now to work around a problem with the JRuby script engine + */ + private ScriptEngine getScriptEngineByExtension(String scriptExtn) { + ScriptEngineManager scriptEngineManager = new ScriptEngineManager(); + if ("rb".equals(scriptExtn)) { + return new TuscanyJRubyScriptEngine(); + } else { + return scriptEngineManager.getEngineByExtension(scriptExtn); + } + } +} |