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Diffstat (limited to 'sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/resolver/DefaultAutowireResolver.java')
| -rw-r--r-- | sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/resolver/DefaultAutowireResolver.java | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/resolver/DefaultAutowireResolver.java b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/resolver/DefaultAutowireResolver.java new file mode 100644 index 0000000000..eab78e25d9 --- /dev/null +++ b/sandbox/rfeng/minicore/src/main/java/org/apache/tuscany/core/resolver/DefaultAutowireResolver.java @@ -0,0 +1,181 @@ +/* + * 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.core.resolver; + +import java.net.URI; +import java.util.HashMap; +import java.util.Map; + +import org.apache.tuscany.spi.model.ComponentDefinition; +import org.apache.tuscany.spi.model.ComponentType; +import org.apache.tuscany.spi.model.CompositeComponentType; +import org.apache.tuscany.spi.model.Implementation; +import org.apache.tuscany.spi.model.ReferenceDefinition; +import org.apache.tuscany.spi.model.ReferenceTarget; +import org.apache.tuscany.spi.model.ServiceContract; +import org.apache.tuscany.spi.model.ServiceDefinition; +import org.apache.tuscany.spi.resolver.ResolutionException; + +/** + * Default implementation of an autowire resolver + * + * @version $Rev$ $Date$ + */ +public class DefaultAutowireResolver implements AutowireResolver { + private Map<ServiceContract, URI> hostAutowire = new HashMap<ServiceContract, URI>(); + + + @SuppressWarnings({"unchecked"}) + public void resolve(ComponentDefinition<Implementation<CompositeComponentType<?, ?, ?>>> parentDefinition, + ComponentDefinition<? extends Implementation<?>> definition) + throws ResolutionException { + ComponentType<?, ?, ?> type = definition.getImplementation().getComponentType(); + // resolve autowires + if (type instanceof CompositeComponentType) { + CompositeComponentType<?, ?, ?> compositeType = (CompositeComponentType<?, ?, ?>) type; + for (ComponentDefinition<? extends Implementation<?>> child : compositeType.getComponents().values()) { + Implementation<?> implementation = child.getImplementation(); + ComponentType<?, ?, ?> childType = implementation.getComponentType(); + if (childType instanceof CompositeComponentType) { + // recurse decendents for composites + resolve((ComponentDefinition<Implementation<CompositeComponentType<?, ?, ?>>>) definition, child); + } + Map<String, ReferenceTarget> targets = child.getReferenceTargets(); + for (ReferenceDefinition reference : childType.getReferences().values()) { + ReferenceTarget target = targets.get(reference.getUri().getFragment()); + if (target == null) { + continue; + } + if (target.isAutowire()) { + ServiceContract requiredContract = reference.getServiceContract(); + resolve(compositeType, requiredContract, target, reference.isRequired()); + } + } + } + } else { + // a leaf level component + ComponentType<?, ?, ?> componentType = definition.getImplementation().getComponentType(); + Map<String, ReferenceTarget> targets = definition.getReferenceTargets(); + for (ReferenceDefinition reference : componentType.getReferences().values()) { + ReferenceTarget target = targets.get(reference.getUri().getFragment()); + if (target == null) { + continue; + } + if (target.isAutowire()) { + ServiceContract requiredContract = reference.getServiceContract(); + CompositeComponentType<?, ?, ?> ctype = parentDefinition.getImplementation().getComponentType(); + resolve(ctype, requiredContract, target, reference.isRequired()); + } + } + } + } + + public void addHostUri(ServiceContract contract, URI uri) { + hostAutowire.put(contract, uri); + } + + public void resolve(CompositeComponentType<?, ?, ?> compositeType) throws ResolutionException { + for (ComponentDefinition<? extends Implementation<?>> child : compositeType.getComponents().values()) { + Implementation<?> implementation = child.getImplementation(); + ComponentType<?, ?, ?> childType = implementation.getComponentType(); + if (childType instanceof CompositeComponentType) { + // recurse decendents for composites + resolve(null, child); + } + Map<String, ReferenceTarget> targets = child.getReferenceTargets(); + for (ReferenceDefinition reference : childType.getReferences().values()) { + ReferenceTarget target = targets.get(reference.getUri().getFragment()); + if (target == null) { + continue; + } + if (target.isAutowire()) { + ServiceContract requiredContract = reference.getServiceContract(); + resolve(compositeType, requiredContract, target, reference.isRequired()); + } + } + } + } + /** + * Performs the actual resolution against a composite TODO this should be extensible allowing for path + * optimizations + * + * @param compositeType the composite component type to resolve against + * @param requiredContract the required target contract + * @param target the reference target + * @param required true if the autowire is required + * @throws AutowireTargetNotFoundException + * + */ + private void resolve(CompositeComponentType<?, ?, ?> compositeType, + ServiceContract requiredContract, + ReferenceTarget target, + boolean required) throws AutowireTargetNotFoundException { + // for now, attempt to match on interface, assume the class can be loaded + Class<?> requiredInterface = requiredContract.getInterfaceClass(); + if (requiredInterface == null) { + throw new UnsupportedOperationException("Only interfaces support for autowire"); + } + // autowire to a target in the parent + URI targetUri = null; + URI candidateUri = null; + // find a suitable target, starting with components first + for (ComponentDefinition<? extends Implementation<?>> candidate : compositeType.getComponents().values()) { + Implementation<?> candidateImpl = candidate.getImplementation(); + ComponentType<?, ?, ?> candidateType = candidateImpl.getComponentType(); + for (ServiceDefinition service : candidateType.getServices().values()) { + Class<?> serviceInterface = service.getServiceContract().getInterfaceClass(); + if (serviceInterface == null) { + continue; + } + if (requiredInterface.equals(serviceInterface)) { + targetUri = URI.create(candidate.getUri().toString() + service.getUri()); + break; + } else if (candidateUri == null && requiredInterface.isAssignableFrom(serviceInterface)) { + candidateUri = URI.create(candidate.getUri().toString() + service.getUri()); + } + } + if (targetUri != null) { + break; + } + } + if (targetUri == null) { + targetUri = resolvePrimordial(requiredContract); + } + if (candidateUri != null) { + targetUri = candidateUri; + } + if (targetUri != null) { + target.addTarget(targetUri); + } + if (targetUri == null && required) { + String uri = target.getReferenceName().toString(); + throw new AutowireTargetNotFoundException("No suitable target found for", uri); + } + } + + private URI resolvePrimordial(ServiceContract contract) { + Class<?> requiredClass = contract.getInterfaceClass(); + for (Map.Entry<ServiceContract, URI> entry : hostAutowire.entrySet()) { + if (requiredClass.isAssignableFrom(entry.getKey().getInterfaceClass())) { + return entry.getValue(); + } + } + return null; + } +} |