| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.http; |
| 20 | |
| 21 | import static com.google.common.base.Preconditions.checkNotNull; |
| 22 | |
| 23 | import java.util.concurrent.ExecutionException; |
| 24 | |
| 25 | import javax.annotation.Resource; |
| 26 | import javax.inject.Inject; |
| 27 | |
| 28 | import org.jclouds.logging.Logger; |
| 29 | import org.jclouds.rest.internal.GeneratedHttpRequest; |
| 30 | |
| 31 | import com.google.common.base.Function; |
| 32 | import com.google.common.util.concurrent.ListenableFuture; |
| 33 | |
| 34 | /** |
| 35 | * Executor which will invoke and transform the response of an {@code EndpointCommand} into generic |
| 36 | * type <T>. |
| 37 | * |
| 38 | * @see TransformingHttpCommand |
| 39 | * |
| 40 | * @author Adrian Cole |
| 41 | */ |
| 42 | public class TransformingHttpCommandImpl<T> implements TransformingHttpCommand<T> { |
| 43 | |
| 44 | protected final TransformingHttpCommandExecutorService executorService; |
| 45 | protected final Function<HttpResponse, T> transformer; |
| 46 | |
| 47 | protected volatile HttpRequest request; |
| 48 | protected volatile int failureCount; |
| 49 | protected volatile int redirectCount; |
| 50 | protected volatile Exception exception; |
| 51 | |
| 52 | @Resource |
| 53 | protected Logger logger = Logger.NULL; |
| 54 | |
| 55 | @Inject |
| 56 | public TransformingHttpCommandImpl(TransformingHttpCommandExecutorService executorService, HttpRequest request, |
| 57 | Function<HttpResponse, T> transformer) { |
| 58 | this.request = checkNotNull(request, "request"); |
| 59 | this.executorService = checkNotNull(executorService, "executorService"); |
| 60 | this.transformer = checkNotNull(transformer, "transformer"); |
| 61 | this.failureCount = 0; |
| 62 | this.redirectCount = 0; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * {@inheritDoc} |
| 67 | */ |
| 68 | @Override |
| 69 | public ListenableFuture<T> execute() throws ExecutionException { |
| 70 | if (exception != null) |
| 71 | throw new ExecutionException(exception); |
| 72 | return executorService.submit(this, transformer); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * {@inheritDoc} |
| 77 | */ |
| 78 | @Override |
| 79 | public int getFailureCount() { |
| 80 | return failureCount; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * {@inheritDoc} |
| 85 | */ |
| 86 | @Override |
| 87 | public int incrementFailureCount() { |
| 88 | return ++failureCount; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * {@inheritDoc} |
| 93 | */ |
| 94 | @Override |
| 95 | public void setException(Exception exception) { |
| 96 | this.exception = exception; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * {@inheritDoc} |
| 101 | */ |
| 102 | @Override |
| 103 | public Exception getException() { |
| 104 | return exception; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * {@inheritDoc} |
| 109 | */ |
| 110 | @Override |
| 111 | public int incrementRedirectCount() { |
| 112 | return ++redirectCount; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * {@inheritDoc} |
| 117 | */ |
| 118 | @Override |
| 119 | public int getRedirectCount() { |
| 120 | return redirectCount; |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * {@inheritDoc} |
| 125 | */ |
| 126 | @Override |
| 127 | public boolean isReplayable() { |
| 128 | return (request.getPayload() == null) ? true : request.getPayload().isRepeatable(); |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * {@inheritDoc} |
| 133 | */ |
| 134 | @Override |
| 135 | public HttpRequest getCurrentRequest() { |
| 136 | return request; |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * {@inheritDoc} |
| 141 | */ |
| 142 | @Override |
| 143 | public void setCurrentRequest(HttpRequest request) { |
| 144 | this.request = request; |
| 145 | } |
| 146 | |
| 147 | @Override |
| 148 | public String toString() { |
| 149 | if (request instanceof GeneratedHttpRequest<?>) |
| 150 | return String.format("[method=%s.%s, request=%s]", GeneratedHttpRequest.class.cast(request).getDeclaring() |
| 151 | .getSimpleName(), GeneratedHttpRequest.class.cast(request).getJavaMethod().getName(), request |
| 152 | .getRequestLine()); |
| 153 | else |
| 154 | return "[request=" + request.getRequestLine() + "]"; |
| 155 | } |
| 156 | |
| 157 | } |