Merge pull request #1059 from jclouds/delegate-with-paths

Delegate with paths

core/src/main/java/org/jclouds/rest/config/CreateClientForCaller.java

@@ -64,11 +64,11 @@ public class CreateClientForCaller extends CacheLoader<ClassMethodArgs, Object>
    }
 
    @Override
-   public Object load(ClassMethodArgs from) throws ExecutionException {
+   public Object load(ClassMethodArgs from) {
       Class<?> syncClass = Optionals2.returnTypeOrTypeOfOptional(from.getMethod());
       Class<?> asyncClass = sync2Async.get(syncClass);
       checkState(asyncClass != null, "configuration error, sync class " + syncClass + " not mapped to an async class");
-      Object asyncClient = asyncMap.get(from);
+      Object asyncClient = asyncMap.getUnchecked(from);
       checkState(asyncClient != null, "configuration error, sync client for " + from + " not found");
       Function<ClassMethodArgsAndReturnVal, Optional<Object>> optionalConverter = injector.getInstance(Key.get(new TypeLiteral<Function<ClassMethodArgsAndReturnVal, Optional<Object>>>() {
       }));

core/src/main/java/org/jclouds/rest/internal/RestAnnotationProcessor.java

@@ -50,7 +50,6 @@ import java.util.Map.Entry;
 import java.util.NoSuchElementException;
 import java.util.Set;
 import java.util.SortedSet;
-import java.util.concurrent.ExecutionException;
 
 import javax.annotation.Resource;
 import javax.inject.Provider;
@@ -144,7 +143,6 @@ import com.google.common.base.Preconditions;
 import com.google.common.base.Predicate;
 import com.google.common.base.Predicates;
 import com.google.common.base.Supplier;
-import com.google.common.base.Throwables;
 import com.google.common.cache.Cache;
 import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
@@ -323,7 +321,7 @@ public class RestAnnotationProcessor<T> {
    @Inject
    public RestAnnotationProcessor(Injector injector, LoadingCache<Class<?>, Boolean> seedAnnotationCache, Cache<MethodKey, Method> delegationMap,
             @ApiVersion String apiVersion, @BuildVersion String buildVersion, ParseSax.Factory parserFactory,
-            HttpUtils utils, ContentMetadataCodec contentMetadataCodec, TypeLiteral<T> typeLiteral) throws ExecutionException {
+            HttpUtils utils, ContentMetadataCodec contentMetadataCodec, TypeLiteral<T> typeLiteral) {
       this.declaring = (Class<T>) typeLiteral.getRawType();
       this.injector = injector;
       this.parserFactory = parserFactory;
@@ -331,7 +329,7 @@ public class RestAnnotationProcessor<T> {
       this.contentMetadataCodec = contentMetadataCodec;
       this.uriBuilderProvider = injector.getProvider(UriBuilder.class);
       this.seedAnnotationCache = seedAnnotationCache;
-      seedAnnotationCache.get(declaring);
+      seedAnnotationCache.getUnchecked(declaring);
       this.delegationMap = delegationMap;
       if (declaring.isAnnotationPresent(SkipEncoding.class)) {
          skips = declaring.getAnnotation(SkipEncoding.class).value();
@@ -382,59 +380,31 @@ public class RestAnnotationProcessor<T> {
    final Injector injector;
 
    private ClassMethodArgs caller;
-   private URI callerEndpoint;
 
    public void setCaller(ClassMethodArgs caller) {
-      try {
+      seedAnnotationCache.getUnchecked(caller.getMethod().getDeclaringClass());
-         seedAnnotationCache.get(caller.getMethod().getDeclaringClass());
-      } catch (ExecutionException e) {
-         Throwables.propagate(e);
-      }
       this.caller = caller;
-      try {
-         UriBuilder builder = uriBuilderProvider.get().uri(getEndpointFor(caller.getMethod(), caller.getArgs(), injector));
-         Multimap<String, String> tokenValues = addPathAndGetTokens(caller.getMethod().getDeclaringClass(), caller.getMethod(), caller.getArgs(), builder);
-         callerEndpoint = builder.buildFromEncodedMap(Maps2.convertUnsafe(tokenValues));
-      } catch (IllegalStateException e) {
-      } catch (ExecutionException e) {
-         Throwables.propagate(e);
-      }
    }
 
    public GeneratedHttpRequest createRequest(Method method, Object... args) {
-      try {
       inputParamValidator.validateMethodParametersOrThrow(method, args);
-         ClassMethodArgs cma = logger.isTraceEnabled() ? new ClassMethodArgs(method.getDeclaringClass(), method, args)
-               : null;
 
-         URI endpoint = callerEndpoint;
-         try {
-            if (endpoint == null) {
-               endpoint = getEndpointFor(method, args, injector);
-               logger.trace("using endpoint %s for %s", endpoint, cma);
-            } else {
-               logger.trace("using endpoint %s from caller %s for %s", caller, endpoint, cma);
-            }
-         } catch (IllegalStateException e) {
-            logger.trace("looking up default endpoint for %s", cma);
-            endpoint = injector.getInstance(Key.get(uriSupplierLiteral, org.jclouds.location.Provider.class)).get();
-            logger.trace("using default endpoint %s for %s", endpoint, cma);
-         }
-         GeneratedHttpRequest.Builder<?> requestBuilder;
-         HttpRequest r = RestAnnotationProcessor.findHttpRequestInArgs(args);
-         if (r != null) {
-            requestBuilder = GeneratedHttpRequest.builder().fromHttpRequest(r);
-            endpoint = r.getEndpoint();
-         } else {
-            requestBuilder = GeneratedHttpRequest.builder();
-            requestBuilder.method(getHttpMethodOrConstantOrThrowException(method));
-         }
 
-         if (endpoint == null) {
+      Optional<URI> endpoint = findEndpoint(method, args);
+
+      if (!endpoint.isPresent()) {
          throw new NoSuchElementException(String.format("no endpoint found for %s",
                new ClassMethodArgs(method.getDeclaringClass(), method, args)));
       }
 
+      GeneratedHttpRequest.Builder<?> requestBuilder = GeneratedHttpRequest.builder();
+      HttpRequest r = RestAnnotationProcessor.findHttpRequestInArgs(args);
+      if (r != null) {
+         requestBuilder.fromHttpRequest(r);
+      } else {
+         requestBuilder.method(getHttpMethodOrConstantOrThrowException(method));
+      }
+
       requestBuilder.declaring(declaring)
                     .javaMethod(method)
                     .args(args)
@@ -442,13 +412,19 @@ public class RestAnnotationProcessor<T> {
                     .skips(skips)
                     .filters(getFiltersIfAnnotated(method));
 
-         UriBuilder builder = uriBuilderProvider.get().uri(endpoint);
+      UriBuilder builder = uriBuilderProvider.get().uri(endpoint.get());
       
       Multimap<String, String> tokenValues = LinkedHashMultimap.create();
 
       tokenValues.put(Constants.PROPERTY_API_VERSION, apiVersion);
       tokenValues.put(Constants.PROPERTY_BUILD_VERSION, buildVersion);
 
+      // make sure any path from the caller is a prefix
+      if (caller != null) {
+         tokenValues.putAll(addPathAndGetTokens(caller.getMethod().getDeclaringClass(), caller.getMethod(),
+               caller.getArgs(), builder));
+      }
+      
       tokenValues.putAll(addPathAndGetTokens(declaring, method, args, builder));
       
       Multimap<String, String> formParams = addFormParams(tokenValues.entries(), method, args);
@@ -459,9 +435,9 @@ public class RestAnnotationProcessor<T> {
          headers.putAll(r.getHeaders());
 
       if (shouldAddHostHeader(method)) {
-            StringBuilder hostHeader = new StringBuilder(endpoint.getHost());
+         StringBuilder hostHeader = new StringBuilder(endpoint.get().getHost());
-            if (endpoint.getPort() != -1)
+         if (endpoint.get().getPort() != -1)
-               hostHeader.append(":").append(endpoint.getPort());
+            hostHeader.append(":").append(endpoint.get().getPort());
          headers.put(HOST, hostHeader.toString());
       }
 
@@ -546,9 +522,39 @@ public class RestAnnotationProcessor<T> {
       }
       utils.checkRequestHasRequiredProperties(request);
       return request;
-      } catch (ExecutionException e) {
-         throw Throwables.propagate(e);
    }
+
+   private Optional<URI> findEndpoint(Method method, Object... args) {
+      ClassMethodArgs cma = logger.isTraceEnabled() ? new ClassMethodArgs(method.getDeclaringClass(), method, args)
+            : null;
+      Optional<URI> endpoint = Optional.absent();
+
+      HttpRequest r = RestAnnotationProcessor.findHttpRequestInArgs(args);
+
+      if (r != null) {
+         endpoint = Optional.fromNullable(r.getEndpoint());
+         if (endpoint.isPresent())
+            logger.trace("using endpoint %s from args for %s", endpoint, cma);
+      }
+
+      if (!endpoint.isPresent() && caller != null) {
+         endpoint = getEndpointFor(caller.getMethod(), caller.getArgs());
+         if (endpoint.isPresent())
+            logger.trace("using endpoint %s from caller %s for %s", endpoint, caller, cma);
+      }
+      if (!endpoint.isPresent()) {
+         endpoint = getEndpointFor(method, args);
+         if (endpoint.isPresent())
+            logger.trace("using endpoint %s for %s", endpoint, cma);
+      }
+      if (!endpoint.isPresent()) {
+         logger.trace("looking up default endpoint for %s", cma);
+         endpoint = Optional.fromNullable(injector.getInstance(
+               Key.get(uriSupplierLiteral, org.jclouds.location.Provider.class)).get());
+         if (endpoint.isPresent())
+            logger.trace("using default endpoint %s for %s", endpoint, cma);
+      }
+      return endpoint;
    }
 
    public static Multimap<String, String> filterOutContentHeaders(Multimap<String, String> headers) {
@@ -562,7 +568,7 @@ public class RestAnnotationProcessor<T> {
 
    public static final String BOUNDARY = "--JCLOUDS--";
 
-   private Multimap<String, String> addPathAndGetTokens(Class<?> clazz, Method method, Object[] args, UriBuilder builder) throws ExecutionException {
+   private Multimap<String, String> addPathAndGetTokens(Class<?> clazz, Method method, Object[] args, UriBuilder builder) {
       if (clazz.isAnnotationPresent(Path.class))
          builder.path(clazz);
       if (method.isAnnotationPresent(Path.class))
@@ -582,7 +588,7 @@ public class RestAnnotationProcessor<T> {
    }
 
    private Multimap<String, String> addMatrixParams(Collection<Entry<String, String>> tokenValues, Method method,
-         Object... args) throws ExecutionException {
+         Object... args) {
       Multimap<String, String> matrixMap = LinkedListMultimap.create();
       if (declaring.isAnnotationPresent(MatrixParams.class)) {
          MatrixParams matrix = declaring.getAnnotation(MatrixParams.class);
@@ -601,7 +607,7 @@ public class RestAnnotationProcessor<T> {
    }
 
    private Multimap<String, String> addFormParams(Collection<Entry<String, String>> tokenValues, Method method,
-         Object... args) throws ExecutionException {
+         Object... args) {
       Multimap<String, String> formMap = LinkedListMultimap.create();
       if (declaring.isAnnotationPresent(FormParams.class)) {
          FormParams form = declaring.getAnnotation(FormParams.class);
@@ -620,7 +626,7 @@ public class RestAnnotationProcessor<T> {
    }
 
    private Multimap<String, String> addQueryParams(Collection<Entry<String, String>> tokenValues, Method method,
-         Object... args) throws ExecutionException {
+         Object... args) {
       Multimap<String, String> queryMap = LinkedListMultimap.create();
       if (declaring.isAnnotationPresent(QueryParams.class)) {
          QueryParams query = declaring.getAnnotation(QueryParams.class);
@@ -711,7 +717,7 @@ public class RestAnnotationProcessor<T> {
    //TODO: change to LoadingCache<ClassMethodArgs, Optional<URI>> and move this logic to the CacheLoader.
    @VisibleForTesting
    public static URI getEndpointInParametersOrNull(Method method, final Object[] args, Injector injector)
-         throws ExecutionException {
+         {
       Map<Integer, Set<Annotation>> map = indexWithAtLeastOneAnnotation(method,
             methodToIndexOfParamToEndpointParamAnnotations);
       if (map.size() >= 1 && args.length > 0) {
@@ -756,7 +762,7 @@ public class RestAnnotationProcessor<T> {
    };
 
    // TODO: change to LoadingCache<ClassMethodArgs, URI> and move this logic to the CacheLoader.
-   public static URI getEndpointFor(Method method, Object[] args, Injector injector) throws ExecutionException {
+   private Optional<URI> getEndpointFor(Method method, Object[] args) {
       URI endpoint = getEndpointInParametersOrNull(method, args, injector);
       if (endpoint == null) {
          Endpoint annotation;
@@ -765,16 +771,18 @@ public class RestAnnotationProcessor<T> {
          } else if (method.getDeclaringClass().isAnnotationPresent(Endpoint.class)) {
             annotation = method.getDeclaringClass().getAnnotation(Endpoint.class);
          } else {
-            throw new IllegalStateException("no annotations on class or method: " + method);
+            logger.trace("no annotations on class or method: %s", method);
+            return Optional.absent();
          }
          endpoint = injector.getInstance(Key.get(uriSupplierLiteral, annotation.value())).get();
       }
       URI providerEndpoint = injector.getInstance(Key.get(uriSupplierLiteral, org.jclouds.location.Provider.class))
                .get();
-      return addHostIfMissing(endpoint, providerEndpoint);
+      return Optional.fromNullable(addHostIfMissing(endpoint, providerEndpoint));
    }
 
-   public static URI addHostIfMissing(URI original, URI withHost) {
+   @VisibleForTesting
+   static URI addHostIfMissing(URI original, URI withHost) {
       checkNotNull(withHost, "URI withHost cannot be null");
       checkArgument(withHost.getHost() != null, "URI withHost must have host:" + withHost);
 
@@ -950,13 +958,13 @@ public class RestAnnotationProcessor<T> {
       }
    };
 
-   public GeneratedHttpRequest decorateRequest(GeneratedHttpRequest request) throws NegativeArraySizeException,
+   public GeneratedHttpRequest decorateRequest(GeneratedHttpRequest request) throws NegativeArraySizeException {
-            ExecutionException {
+      Iterable<Entry<Integer, Set<Annotation>>> binderOrWrapWith = concat(
-      OUTER: for (Entry<Integer, Set<Annotation>> entry : concat(//
+            filterValues(methodToIndexOfParamToBinderParamAnnotation.getUnchecked(request.getJavaMethod()).asMap(),
-               filterValues(methodToIndexOfParamToBinderParamAnnotation.get(request.getJavaMethod()).asMap(), notEmpty)
+                  notEmpty).entrySet(),
-                        .entrySet(), //
+            filterValues(methodToIndexOfParamToWrapWithAnnotation.getUnchecked(request.getJavaMethod()).asMap(),
-               filterValues(methodToIndexOfParamToWrapWithAnnotation.get(request.getJavaMethod()).asMap(), notEmpty)
+                  notEmpty).entrySet());
-                        .entrySet())) {
+      OUTER: for (Entry<Integer, Set<Annotation>> entry : binderOrWrapWith) {
          boolean shouldBreak = false;
          Annotation annotation = Iterables.get(entry.getValue(), 0);
          Binder binder;
@@ -1018,7 +1026,7 @@ public class RestAnnotationProcessor<T> {
    }
 
    public static Map<Integer, Set<Annotation>> indexWithOnlyOneAnnotation(Method method, String description,
-         LoadingCache<Method, LoadingCache<Integer, Set<Annotation>>> toRefine) throws ExecutionException {
+         LoadingCache<Method, LoadingCache<Integer, Set<Annotation>>> toRefine) {
       Map<Integer, Set<Annotation>> indexToPayloadAnnotation = indexWithAtLeastOneAnnotation(method, toRefine);
       if (indexToPayloadAnnotation.size() > 1) {
          throw new IllegalStateException(String.format(
@@ -1029,8 +1037,8 @@ public class RestAnnotationProcessor<T> {
    }
 
    private static Map<Integer, Set<Annotation>> indexWithAtLeastOneAnnotation(Method method,
-         LoadingCache<Method, LoadingCache<Integer, Set<Annotation>>> toRefine) throws ExecutionException {
+         LoadingCache<Method, LoadingCache<Integer, Set<Annotation>>> toRefine) {
-      Map<Integer, Set<Annotation>> indexToPayloadAnnotation = filterValues(toRefine.get(method).asMap(),
+      Map<Integer, Set<Annotation>> indexToPayloadAnnotation = filterValues(toRefine.getUnchecked(method).asMap(),
             new Predicate<Set<Annotation>>() {
                public boolean apply(Set<Annotation> input) {
                   return input.size() == 1;
@@ -1040,9 +1048,9 @@ public class RestAnnotationProcessor<T> {
    }
 
   //TODO: change to LoadingCache<ClassMethodArgs, HttpRequestOptions and move this logic to the CacheLoader.
-  private Set<HttpRequestOptions> findOptionsIn(Method method, Object... args) throws ExecutionException {
+  private Set<HttpRequestOptions> findOptionsIn(Method method, Object... args) {
      ImmutableSet.Builder<HttpRequestOptions> result = ImmutableSet.builder();
-     for (int index : methodToIndexesOfOptions.get(method)) {
+     for (int index : methodToIndexesOfOptions.getUnchecked(method)) {
          if (args.length >= index + 1) {// accommodate varargs
             if (args[index] instanceof Object[]) {
                for (Object option : (Object[]) args[index]) {
@@ -1063,10 +1071,11 @@ public class RestAnnotationProcessor<T> {
    }
 
    public Multimap<String, String> buildHeaders(Collection<Entry<String, String>> tokenValues, Method method,
-         final Object... args) throws ExecutionException {
+         final Object... args) {
       Multimap<String, String> headers = LinkedHashMultimap.create();
       addHeaderIfAnnotationPresentOnMethod(headers, method, tokenValues);
-      LoadingCache<Integer, Set<Annotation>> indexToHeaderParam = methodToIndexOfParamToHeaderParamAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToHeaderParam = methodToIndexOfParamToHeaderParamAnnotations
+            .getUnchecked(method);
       for (Entry<Integer, Set<Annotation>> entry : indexToHeaderParam.asMap().entrySet()) {
          for (Annotation key : entry.getValue()) {
             String value = args[entry.getKey()].toString();
@@ -1131,9 +1140,10 @@ public class RestAnnotationProcessor<T> {
 
    }
 
-   List<? extends Part> getParts(Method method, Object[] args, Iterable<Entry<String, String>> iterable) throws ExecutionException {
+   List<? extends Part> getParts(Method method, Object[] args, Iterable<Entry<String, String>> iterable) {
       List<Part> parts = newLinkedList();
-      LoadingCache<Integer, Set<Annotation>> indexToPartParam = methodToIndexOfParamToPartParamAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToPartParam = methodToIndexOfParamToPartParamAnnotations
+            .getUnchecked(method);
       for (Entry<Integer, Set<Annotation>> entry : indexToPartParam.asMap().entrySet()) {
          for (Annotation key : entry.getValue()) {
             PartParam param = (PartParam) key;
@@ -1172,14 +1182,14 @@ public class RestAnnotationProcessor<T> {
    }
 
    //TODO: change to LoadingCache<ClassMethodArgs, Multimap<String,String> and move this logic to the CacheLoader.
-   private Multimap<String, String> getPathParamKeyValues(Method method, Object... args) throws ExecutionException {
+   private Multimap<String, String> getPathParamKeyValues(Method method, Object... args) {
       Multimap<String, String> pathParamValues = LinkedHashMultimap.create();
-      LoadingCache<Integer, Set<Annotation>> indexToPathParam = methodToIndexOfParamToPathParamAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToPathParam = methodToIndexOfParamToPathParamAnnotations.getUnchecked(method);
 
-      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations.getUnchecked(method);
       for (Entry<Integer, Set<Annotation>> entry : indexToPathParam.asMap().entrySet()) {
          for (Annotation key : entry.getValue()) {
-            Set<Annotation> extractors = indexToParamExtractor.get(entry.getKey());
+            Set<Annotation> extractors = indexToParamExtractor.getUnchecked(entry.getKey());
             String paramKey = ((PathParam) key).value();
             Optional<?> paramValue = getParamValue(method, args, extractors, entry, paramKey);
             if (paramValue.isPresent())
@@ -1240,14 +1250,16 @@ public class RestAnnotationProcessor<T> {
    }
 
    //TODO: change to LoadingCache<ClassMethodArgs, Multimap<String,String> and move this logic to the CacheLoader.
-   private Multimap<String, String> getMatrixParamKeyValues(Method method, Object... args) throws ExecutionException {
+   private Multimap<String, String> getMatrixParamKeyValues(Method method, Object... args) {
       Multimap<String, String> matrixParamValues = LinkedHashMultimap.create();
-      LoadingCache<Integer, Set<Annotation>> indexToMatrixParam = methodToIndexOfParamToMatrixParamAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToMatrixParam = methodToIndexOfParamToMatrixParamAnnotations
+            .getUnchecked(method);
 
-      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations
+            .getUnchecked(method);
       for (Entry<Integer, Set<Annotation>> entry : indexToMatrixParam.asMap().entrySet()) {
          for (Annotation key : entry.getValue()) {
-            Set<Annotation> extractors = indexToParamExtractor.get(entry.getKey());
+            Set<Annotation> extractors = indexToParamExtractor.getUnchecked(entry.getKey());
             String paramKey = ((MatrixParam) key).value();
             Optional<?> paramValue = getParamValue(method, args, extractors, entry, paramKey);
             if (paramValue.isPresent())
@@ -1266,14 +1278,16 @@ public class RestAnnotationProcessor<T> {
 
    //TODO: change to LoadingCache<ClassMethodArgs, Multimap<String,String> and move this logic to the CacheLoader.
    //take care to manage size of this cache
-   private Multimap<String, String> getFormParamKeyValues(Method method, Object... args) throws ExecutionException {
+   private Multimap<String, String> getFormParamKeyValues(Method method, Object... args) {
       Multimap<String, String> formParamValues = LinkedHashMultimap.create();
-      LoadingCache<Integer, Set<Annotation>> indexToFormParam = methodToIndexOfParamToFormParamAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToFormParam = methodToIndexOfParamToFormParamAnnotations
+            .getUnchecked(method);
 
-      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations
+            .getUnchecked(method);
       for (Entry<Integer, Set<Annotation>> entry : indexToFormParam.asMap().entrySet()) {
          for (Annotation key : entry.getValue()) {
-            Set<Annotation> extractors = indexToParamExtractor.get(entry.getKey());
+            Set<Annotation> extractors = indexToParamExtractor.getUnchecked(entry.getKey());
             String paramKey = ((FormParam) key).value();
             Optional<?> paramValue = getParamValue(method, args, extractors, entry, paramKey);
             if (paramValue.isPresent())
@@ -1291,14 +1305,16 @@ public class RestAnnotationProcessor<T> {
    }
 
    //TODO: change to LoadingCache<ClassMethodArgs, Multimap<String,String> and move this logic to the CacheLoader.
-   private Multimap<String, String> getQueryParamKeyValues(Method method, Object... args) throws ExecutionException {
+   private Multimap<String, String> getQueryParamKeyValues(Method method, Object... args) {
       Multimap<String, String> queryParamValues = LinkedHashMultimap.create();
-      LoadingCache<Integer, Set<Annotation>> indexToQueryParam = methodToIndexOfParamToQueryParamAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToQueryParam = methodToIndexOfParamToQueryParamAnnotations
+            .getUnchecked(method);
 
-      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations
+            .getUnchecked(method);
       for (Entry<Integer, Set<Annotation>> entry : indexToQueryParam.asMap().entrySet()) {
          for (Annotation key : entry.getValue()) {
-            Set<Annotation> extractors = indexToParamExtractor.get(entry.getKey());
+            Set<Annotation> extractors = indexToParamExtractor.getUnchecked(entry.getKey());
             String paramKey = ((QueryParam) key).value();
             Optional<?> paramValue = getParamValue(method, args, extractors, entry, paramKey);
             if (paramValue.isPresent())
@@ -1317,13 +1333,13 @@ public class RestAnnotationProcessor<T> {
 
    //TODO: change to LoadingCache<ClassMethodArgs, Map<String,Object> and move this logic to the CacheLoader.
    //take care to manage size of this cache
-   private Map<String, Object> buildPostParams(Method method, Object... args) throws ExecutionException {
+   private Map<String, Object> buildPostParams(Method method, Object... args) {
       Map<String, Object> postParams = newHashMap();
-      LoadingCache<Integer, Set<Annotation>> indexToPathParam = methodToIndexOfParamToPostParamAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToPathParam = methodToIndexOfParamToPostParamAnnotations.getUnchecked(method);
-      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations.get(method);
+      LoadingCache<Integer, Set<Annotation>> indexToParamExtractor = methodToIndexOfParamToParamParserAnnotations.getUnchecked(method);
       for (Entry<Integer, Set<Annotation>> entry : indexToPathParam.asMap().entrySet()) {
          for (Annotation key : entry.getValue()) {
-            Set<Annotation> extractors = indexToParamExtractor.get(entry.getKey());
+            Set<Annotation> extractors = indexToParamExtractor.getUnchecked(entry.getKey());
             String paramKey = ((PayloadParam) key).value();
             Optional<?> paramValue = getParamValue(method, args, extractors, entry, paramKey);
             if (paramValue.isPresent())

core/src/test/java/org/jclouds/rest/annotationparsing/DelegateAnnotationExpectTest.java

@@ -0,0 +1,116 @@
+/**
+ * Licensed to jclouds, Inc. (jclouds) under one or more
+ * contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  jclouds 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.jclouds.rest.annotationparsing;
+
+import static org.jclouds.providers.AnonymousProviderMetadata.forClientMappedToAsyncClientOnEndpoint;
+import static org.testng.Assert.assertTrue;
+
+import java.util.concurrent.TimeUnit;
+
+import javax.ws.rs.HEAD;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+
+import org.jclouds.concurrent.Timeout;
+import org.jclouds.http.HttpRequest;
+import org.jclouds.http.HttpResponse;
+import org.jclouds.providers.ProviderMetadata;
+import org.jclouds.rest.ConfiguresRestClient;
+import org.jclouds.rest.annotations.Delegate;
+import org.jclouds.rest.annotations.ExceptionParser;
+import org.jclouds.rest.config.RestClientModule;
+import org.jclouds.rest.functions.ReturnFalseOnNotFoundOr404;
+import org.jclouds.rest.internal.BaseRestClientExpectTest;
+import org.testng.annotations.Test;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.inject.Module;
+
+/**
+ * Tests the ways that {@link Delegate}
+ * 
+ * @author Adrian Cole
+ */
+@Test(groups = "unit", testName = "DelegateAnnotationExpectTest")
+public class DelegateAnnotationExpectTest extends BaseRestClientExpectTest<DelegateAnnotationExpectTest.DelegatingApi> {
+
+   @Timeout(duration = 60, timeUnit = TimeUnit.SECONDS)
+   static interface DelegatingApi {
+
+      @Delegate
+      @Path("/projects/{project}")
+      DiskApi getDiskApiForProject(@PathParam("project") String projectName);
+   }
+
+   static interface DelegatingAsyncApi {
+
+      @Delegate
+      @Path("/projects/{project}")
+      DiskAsyncApi getDiskApiForProject(@PathParam("project") String projectName);
+   }
+
+   @Timeout(duration = 1, timeUnit = TimeUnit.SECONDS)
+   static interface DiskApi {
+
+      boolean exists(@PathParam("disk") String diskName);
+   }
+
+   static interface DiskAsyncApi {
+
+      @HEAD
+      @Path("/disks/{disk}")
+      @ExceptionParser(ReturnFalseOnNotFoundOr404.class)
+      public ListenableFuture<Boolean> exists(@PathParam("disk") String diskName);
+   }
+
+   public void testDelegatingCallTakesIntoConsiderationCallerAndCalleePath() {
+
+      DelegatingApi client = requestSendsResponse(
+            HttpRequest.builder().method("HEAD").endpoint("http://mock/projects/prod/disks/disk1").build(),
+            HttpResponse.builder().statusCode(200).build());
+
+      assertTrue(client.getDiskApiForProject("prod").exists("disk1"));
+
+   }
+
+   // crufty junk until we inspect delegating api classes for all their client
+   // mappings and make a test helper for random classes.
+
+   @Override
+   public ProviderMetadata createProviderMetadata() {
+      return forClientMappedToAsyncClientOnEndpoint(DelegatingApi.class, DelegatingAsyncApi.class, "http://mock/");
+   }
+
+   @Override
+   protected Module createModule() {
+      return new DelegatingRestClientModule();
+   }
+
+   @ConfiguresRestClient
+   static class DelegatingRestClientModule extends RestClientModule<DelegatingApi, DelegatingAsyncApi> {
+
+      public DelegatingRestClientModule() {
+         // right now, we have to define the delegates by hand as opposed to
+         // reflection looking for coordinated annotations
+         super(ImmutableMap.<Class<?>, Class<?>> of(DiskApi.class, DiskAsyncApi.class));
+      }
+   }
+
+}