com.jcabi.http.wire.RetryWire Maven / Gradle / Ivy
/**
* Copyright (c) 2011-2015, jcabi.com
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met: 1) Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer. 2) Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution. 3) Neither the name of the jcabi.com nor
* the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
* NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jcabi.http.wire;
import com.jcabi.aspects.Immutable;
import com.jcabi.aspects.Tv;
import com.jcabi.http.Request;
import com.jcabi.http.Response;
import com.jcabi.http.Wire;
import com.jcabi.log.Logger;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.util.Collection;
import java.util.Map;
import javax.validation.constraints.NotNull;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* Wire that retries a few times before giving up and throwing exception.
*
* This wire retries again (at least three times) if an original one throws
* {@link IOException}:
*
*
String html = new JdkRequest("http://goggle.com")
* .through(RetryWire.class)
* .header(HttpHeaders.ACCEPT, MediaType.TEXT_PLAIN)
* .fetch()
* .body();
*
* Since version 1.9 this wire retries also if HTTP status code
* is between 500 and 599.
*
*
The class is immutable and thread-safe.
*
* @author Yegor Bugayenko ([email protected])
* @version $Id: 73f51a7c488932710648765e7df62f50c2715f5f $
* @since 0.10
*/
@Immutable
@ToString
@EqualsAndHashCode(of = "origin")
public final class RetryWire implements Wire {
/**
* Original wire.
*/
private final transient Wire origin;
/**
* Public ctor.
* @param wire Original wire
*/
public RetryWire(@NotNull(message = "wire can't be NULL")
final Wire wire) {
this.origin = wire;
}
// @checkstyle ParameterNumber (13 lines)
@Override
public Response send(final Request req, final String home,
final String method,
final Collection> headers,
final InputStream content,
final int connect, final int read) throws IOException {
int attempt = 0;
while (true) {
if (attempt > Tv.THREE) {
throw new IOException(
String.format("failed after %d attempts", attempt)
);
}
try {
final Response rsp = this.origin.send(
req, home, method, headers, content,
connect, read
);
if (rsp.status() < HttpURLConnection.HTTP_INTERNAL_ERROR) {
return rsp;
}
Logger.warn(
this, "%s %s returns %d status (attempt #%d)",
method, home, rsp.status(), attempt + 1
);
} catch (final IOException ex) {
Logger.warn(
this, "%s: %s",
ex.getClass().getName(), ex.getLocalizedMessage()
);
}
++attempt;
}
}
}