public abstract class CloseableHttpClient implements HttpClient, Closeable {
private final Log log = LogFactory.getLog(getClass());
protected abstract CloseableHttpResponse doExecute(HttpHost target, HttpRequest request,
HttpContext context) throws IOException, ClientProtocolException;
/**
* {@inheritDoc}
*/
public CloseableHttpResponse execute(
final HttpHost target,
final HttpRequest request,
final HttpContext context) throws IOException, ClientProtocolException {
return doExecute(target, request, context);
}
/**
* {@inheritDoc}
*/
public CloseableHttpResponse execute(
final HttpUriRequest request,
final HttpContext context) throws IOException, ClientProtocolException {
Args.notNull(request, "HTTP request");
return doExecute(determineTarget(request), request, context);
}
private static HttpHost determineTarget(final HttpUriRequest request) throws ClientProtocolException {
// A null target may be acceptable if there is a default target.
// Otherwise, the null target is detected in the director.
HttpHost target = null;
final URI requestURI = request.getURI();
if (requestURI.isAbsolute()) {
target = URIUtils.extractHost(requestURI);
if (target == null) {
throw new ClientProtocolException("URI does not specify a valid host name: "
+ requestURI);
}
}
return target;
}
/**
* {@inheritDoc}
*/
public CloseableHttpResponse execute(
final HttpUriRequest request) throws IOException, ClientProtocolException {
return execute(request, (HttpContext) null);
}
/**
* {@inheritDoc}
*/
public CloseableHttpResponse execute(
final HttpHost target,
final HttpRequest request) throws IOException, ClientProtocolException {
return doExecute(target, request, (HttpContext) null);
}
/**
* Executes a request using the default context and processes the
* response using the given response handler. The content entity associated
* with the response is fully consumed and the underlying connection is
* released back to the connection manager automatically in all cases
* relieving individual {@link ResponseHandler}s from having to manage
* resource deallocation internally.
*
* @param request the request to execute
* @param responseHandler the response handler
*
* @return the response object as generated by the response handler.
* @throws IOException in case of a problem or the connection was aborted
* @throws ClientProtocolException in case of an http protocol error
*/
public <T> T execute(final HttpUriRequest request,
final ResponseHandler<? extends T> responseHandler) throws IOException,
ClientProtocolException {
return execute(request, responseHandler, null);
}
/**
* Executes a request using the default context and processes the
* response using the given response handler. The content entity associated
* with the response is fully consumed and the underlying connection is
* released back to the connection manager automatically in all cases
* relieving individual {@link ResponseHandler}s from having to manage
* resource deallocation internally.
*
* @param request the request to execute
* @param responseHandler the response handler
* @param context the context to use for the execution, or
* <code>null</code> to use the default context
*
* @return the response object as generated by the response handler.
* @throws IOException in case of a problem or the connection was aborted
* @throws ClientProtocolException in case of an http protocol error
*/
public <T> T execute(final HttpUriRequest request,
final ResponseHandler<? extends T> responseHandler, final HttpContext context)
throws IOException, ClientProtocolException {
final HttpHost target = determineTarget(request);
return execute(target, request, responseHandler, context);
}
/**
* Executes a request using the default context and processes the
* response using the given response handler. The content entity associated
* with the response is fully consumed and the underlying connection is
* released back to the connection manager automatically in all cases
* relieving individual {@link ResponseHandler}s from having to manage
* resource deallocation internally.
*
* @param target the target host for the request.
* Implementations may accept <code>null</code>
* if they can still determine a route, for example
* to a default target or by inspecting the request.
* @param request the request to execute
* @param responseHandler the response handler
*
* @return the response object as generated by the response handler.
* @throws IOException in case of a problem or the connection was aborted
* @throws ClientProtocolException in case of an http protocol error
*/
public <T> T execute(final HttpHost target, final HttpRequest request,
final ResponseHandler<? extends T> responseHandler) throws IOException,
ClientProtocolException {
return execute(target, request, responseHandler, null);
}
/**
* Executes a request using the default context and processes the
* response using the given response handler. The content entity associated
* with the response is fully consumed and the underlying connection is
* released back to the connection manager automatically in all cases
* relieving individual {@link ResponseHandler}s from having to manage
* resource deallocation internally.
*
* @param target the target host for the request.
* Implementations may accept <code>null</code>
* if they can still determine a route, for example
* to a default target or by inspecting the request.
* @param request the request to execute
* @param responseHandler the response handler
* @param context the context to use for the execution, or
* <code>null</code> to use the default context
*
* @return the response object as generated by the response handler.
* @throws IOException in case of a problem or the connection was aborted
* @throws ClientProtocolException in case of an http protocol error
*/
public <T> T execute(final HttpHost target, final HttpRequest request,
final ResponseHandler<? extends T> responseHandler, final HttpContext context)
throws IOException, ClientProtocolException {
Args.notNull(responseHandler, "Response handler");
final HttpResponse response = execute(target, request, context);
final T result;
try {
result = responseHandler.handleResponse(response);
} catch (final Exception t) {
final HttpEntity entity = response.getEntity();
try {
EntityUtils.consume(entity);
} catch (final Exception t2) {
// Log this exception. The original exception is more
// important and will be thrown to the caller.
this.log.warn("Error consuming content after an exception.", t2);
}
if (t instanceof RuntimeException) {
throw (RuntimeException) t;
}
if (t instanceof IOException) {
throw (IOException) t;
}
throw new UndeclaredThrowableException(t);
}
// Handling the response was successful. Ensure that the content has
// been fully consumed.
final HttpEntity entity = response.getEntity();
EntityUtils.consume(entity);
return result;
}
}