Add the ability to map binding.sca to any bindings in the runtime by configuration

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@918261 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 217 insertions, 0 deletions

diff --git a/sca-java-2.x/trunk/modules/binding-sca-runtime/src/main/java/org/apache/tuscany/sca/binding/sca/provider/DefaultSCABindingMapper.java b/sca-java-2.x/trunk/modules/binding-sca-runtime/src/main/java/org/apache/tuscany/sca/binding/sca/provider/DefaultSCABindingMapper.java
new file mode 100644
index 0000000000..14c8fae369
--- /dev/null
+++ b/sca-java-2.x/trunk/modules/binding-sca-runtime/src/main/java/org/apache/tuscany/sca/binding/sca/provider/DefaultSCABindingMapper.java
@@ -0,0 +1,217 @@
+/*
+ * 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.binding.sca.provider;
+
+import java.io.StringReader;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Logger;
+
+import javax.xml.namespace.QName;
+import javax.xml.stream.XMLStreamException;
+import javax.xml.stream.XMLStreamReader;
+
+import org.apache.tuscany.sca.assembly.Base;
+import org.apache.tuscany.sca.assembly.Binding;
+import org.apache.tuscany.sca.assembly.builder.BindingBuilder;
+import org.apache.tuscany.sca.assembly.builder.BuilderContext;
+import org.apache.tuscany.sca.assembly.builder.BuilderExtensionPoint;
+import org.apache.tuscany.sca.common.xml.stax.StAXHelper;
+import org.apache.tuscany.sca.contribution.processor.ContributionReadException;
+import org.apache.tuscany.sca.contribution.processor.ProcessorContext;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessor;
+import org.apache.tuscany.sca.contribution.processor.StAXArtifactProcessorExtensionPoint;
+import org.apache.tuscany.sca.core.ExtensionPointRegistry;
+import org.apache.tuscany.sca.extensibility.ServiceDeclarationParser;
+import org.apache.tuscany.sca.policy.PolicySubject;
+import org.apache.tuscany.sca.provider.ProviderFactory;
+import org.apache.tuscany.sca.provider.ProviderFactoryExtensionPoint;
+import org.apache.tuscany.sca.runtime.DomainRegistryFactory;
+import org.apache.tuscany.sca.runtime.DomainRegistryFactoryExtensionPoint;
+import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
+import org.apache.tuscany.sca.runtime.RuntimeEndpointReference;
+import org.oasisopen.sca.ServiceRuntimeException;
+
+/**
+ * Default implementation of SCABindingMapper
+ */
+public class DefaultSCABindingMapper implements SCABindingMapper {
+    private final static Logger logger = Logger.getLogger(DefaultSCABindingMapper.class.getName());
+    protected ExtensionPointRegistry registry;
+    protected ProviderFactoryExtensionPoint providerFactories;
+    protected StAXArtifactProcessor processor;
+    protected BindingBuilder builder;
+    protected QName mappedBinding;
+    private Binding bindingTemplate;
+    private boolean remotable;
+
+    public DefaultSCABindingMapper(ExtensionPointRegistry registry, Map<String, String> attributes) {
+        this.registry = registry;
+        providerFactories = registry.getExtensionPoint(ProviderFactoryExtensionPoint.class);
+        BuilderExtensionPoint builders = registry.getExtensionPoint(BuilderExtensionPoint.class);
+        StAXArtifactProcessorExtensionPoint processors =
+            registry.getExtensionPoint(StAXArtifactProcessorExtensionPoint.class);
+        if (attributes != null) {
+            String qname = attributes.get("mappedBinding");
+            if (qname != null) {
+                mappedBinding = ServiceDeclarationParser.getQName(qname);
+            }
+        }
+        if (mappedBinding == null) {
+            String qname =
+                System.getProperty("org.apache.tuscany.sca.binding.sca.provider.SCABindingMapper.mappedBinding");
+            if (qname != null) {
+                mappedBinding = ServiceDeclarationParser.getQName(qname);
+            } else {
+                // By default, mapping to binding.ws
+                mappedBinding = new QName(Base.SCA11_NS, "binding.ws");
+            }
+        }
+
+        processor = processors.getProcessor(mappedBinding);
+        builder = builders.getBindingBuilder(mappedBinding);
+        if (processor == null) {
+            logger.warning("Mapped binding for binding.sca is not supported: " + mappedBinding);
+        }
+
+        try {
+            if (processor != null) {
+                bindingTemplate = createDelegatingBinding();
+                ProviderFactory providerFactory = providerFactories.getProviderFactory(bindingTemplate.getClass());
+                if (providerFactory == null) {
+                    logger.warning("Mapped binding for binding.sca is not supported: " + mappedBinding);
+                    processor = null;
+                }
+            }
+        } catch (Throwable e) {
+            throw new ServiceRuntimeException(e);
+        }
+        remotable = isDistributed() && processor != null;
+    }
+
+    // FIXME: [rfeng] This is a HACK to check if we should make binding.sca remotable
+    // by checking if we have distributed domain registry present
+    private boolean isDistributed() {
+        DomainRegistryFactoryExtensionPoint factories =
+            registry.getExtensionPoint(DomainRegistryFactoryExtensionPoint.class);
+        List<DomainRegistryFactory> list = factories.getDomainRegistryFactories();
+        if (list.size() == 1) {
+            String[] schemes = list.get(0).getSupportedSchemes();
+            if (Arrays.asList(schemes).contains("local")) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public RuntimeEndpoint map(RuntimeEndpoint endpoint) {
+        if (processor == null) {
+            return null;
+        }
+        // create a copy of the endpoint  but with the web service binding in
+        RuntimeEndpoint ep = null;
+        try {
+            ep = (RuntimeEndpoint)endpoint.clone();
+        } catch (Exception ex) {
+            // we know we can clone endpoint references
+        }
+
+        Binding binding = map(endpoint.getBinding(), false);
+        ep.setBinding(binding);
+        if (builder != null) {
+            builder.build(ep.getComponent(), ep.getService(), binding, new BuilderContext(registry));
+        }
+        return ep;
+    }
+
+    public RuntimeEndpointReference map(RuntimeEndpointReference endpointReference) {
+        if (processor == null) {
+            return null;
+        }
+        // create a copy of the endpoint  but with the web service binding in
+        RuntimeEndpointReference epr = null;
+        try {
+            epr = (RuntimeEndpointReference)endpointReference.clone();
+        } catch (Exception ex) {
+            // we know we can clone endpoint references
+        }
+
+        Binding binding = map(endpointReference.getBinding(), true);
+        epr.setBinding(binding);
+
+        // epr.setTargetEndpoint(map((RuntimeEndpoint)epr.getTargetEndpoint()));
+
+        if (builder != null) {
+            builder.build(epr.getComponent(), epr.getReference(), binding, new BuilderContext(registry));
+        }
+
+        return epr;
+    }
+
+    protected Binding map(Binding scaBinding, boolean referenceSide) {
+        try {
+            Binding binding = createDelegatingBinding();
+            binding.setName(scaBinding.getName());
+            if (!referenceSide) {
+                // Only set the binding URI for the service side
+                binding.setURI(scaBinding.getURI());
+            }
+            binding.setOperationSelector(scaBinding.getOperationSelector());
+            binding.setRequestWireFormat(scaBinding.getRequestWireFormat());
+            binding.setResponseWireFormat(scaBinding.getResponseWireFormat());
+            if (binding instanceof PolicySubject && scaBinding instanceof PolicySubject) {
+                PolicySubject subject1 = (PolicySubject)binding;
+                PolicySubject subject2 = (PolicySubject)scaBinding;
+                subject1.getPolicySets().addAll(subject2.getPolicySets());
+                subject1.getRequiredIntents().addAll(subject2.getRequiredIntents());
+            }
+            return binding;
+        } catch (Throwable e) {
+            throw new ServiceRuntimeException(e);
+        }
+
+    }
+
+    private Binding createDelegatingBinding() throws XMLStreamException, ContributionReadException {
+        if (bindingTemplate != null) {
+            try {
+                return (Binding)bindingTemplate.clone();
+            } catch (CloneNotSupportedException e) {
+                // Ignore
+            }
+        }
+        // This is a hack to create an instance of the binding using the XML QName
+        StringBuffer xml = new StringBuffer();
+        xml.append("<").append(mappedBinding.getLocalPart()).append(" xmlns:b=\"").append(mappedBinding
+            .getNamespaceURI()).append("\"/>");
+
+        StAXHelper staxHelper = StAXHelper.getInstance(registry);
+        XMLStreamReader reader = staxHelper.createXMLStreamReader(new StringReader(xml.toString()));
+        reader.nextTag();
+        Binding binding = (Binding)processor.read(reader, new ProcessorContext(registry));
+        return binding;
+    }
+
+    public boolean isRemotable() {
+        return remotable;
+    }
+
+}