/*
* Copyright (c) 2010 Google Inc.
*
* Licensed 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 com.google.api.client.http;
import java.io.IOException;
/**
* HTTP request execute interceptor to intercept the start of {@link HttpRequest#execute()} before
* executing the HTTP request.
*
* <p>
* For example, this might be used to sign a request for OAuth:
* </p>
*
* <pre>
public class OAuthSigner implements HttpExecuteInterceptor {
public void intercept(HttpRequest request) throws IOException {
// sign request...
}
}
* </pre>
*
* <p>
* Sample usage with a request factory:
* </p>
*
* <pre>
public static HttpRequestFactory createRequestFactory(HttpTransport transport) {
final OAuthSigner signer = new OAuthSigner(...);
return transport.createRequestFactory(new HttpRequestInitializer() {
public void initialize(HttpRequest request) {
request.setInterceptor(signer);
}
});
}
* </pre>
*
* <p>
* More complex usage example:
* </p>
*
* <pre>
public static HttpRequestFactory createRequestFactory2(HttpTransport transport) {
final OAuthSigner signer = new OAuthSigner(...);
return transport.createRequestFactory(new HttpRequestInitializer() {
public void initialize(HttpRequest request) {
request.setInterceptor(new HttpExecuteInterceptor() {
public void intercept(HttpRequest request) throws IOException {
signer.intercept(request);
}
});
}
});
}
* </pre>
*
* <p>
* Implementations should normally be thread-safe.
* </p>
*
* @since 1.0
* @author Yaniv Inbar
*/
public interface HttpExecuteInterceptor {
/** Invoked at the start of {@link HttpRequest#execute()} before executing the HTTP request. */
void intercept(HttpRequest request) throws IOException;
}