/* * The MIT License (MIT) * * Copyright (c) 2019 Vedran Grgo Vatavuk * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ package hr.com.vgv.verano.http.wire; import com.jcabi.log.Logger; import hr.com.vgv.verano.http.Dict; import hr.com.vgv.verano.http.Wire; import hr.com.vgv.verano.http.parts.Method; import hr.com.vgv.verano.http.parts.RequestUri; import hr.com.vgv.verano.http.response.Status; import java.net.HttpURLConnection; /** * Wire that retries sending a request specified number of times before throwing * an exception. * * Example of usage: * * <pre> * new Response( * new RetryWire( * new ApacheWire("https://example.com"), 5 * ), * new Post( * new Body("Hello World!") * ) * ).touch(); * </pre> * * @since 1.0 */ @SuppressWarnings( {"PMD.AvoidCatchingGenericException", "PMD.GuardLogStatement"} ) public class RetryWire implements Wire { /** * Original wire. */ private final Wire origin; /** * Number of attempts before throwing an exception. */ private final int attempts; /** * Ctor. * @param origin Original wire */ public RetryWire(final Wire origin) { //@checkstyle MagicNumberCheck (1 lines) this(origin, 3); } /** * Ctor. * @param origin Original wire * @param attempts Number of attempts before throwing an exception */ public RetryWire(final Wire origin, final int attempts) { this.origin = origin; this.attempts = attempts; } @Override public final Dict send(final Dict request) { int attempt = 0; final String method = new Method.Of(request).asString(); final String uri = new RequestUri.Of(request).asString(); while (attempt < this.attempts) { try { final Dict response = this.origin.send(request); final int status = new Status.Of(response).intValue(); if (status < HttpURLConnection.HTTP_INTERNAL_ERROR) { return response; } Logger.warn( this, "%s %s returns %d status (attempt #%d)", method, uri, status, attempt + 1 ); //@checkstyle IllegalCatchCheck (1 lines) } catch (final Exception ex) { Logger.warn( this, "%s: %s", ex.getClass().getName(), ex.getLocalizedMessage() ); } ++attempt; } throw new IllegalStateException( String.format("Failed after %d attempts", attempt) ); } }