/* * Copyright ( c ) 2014 , 2019 , Oracle and / or its affiliates . All rights reserved . * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER . * * This code is free software ; you can redistribute it and / or modify it * under the terms of the GNU General Public License version 2 only , as * published by the Free Software Foundation . Oracle designates this * particular file as subject to the " Classpath " exception as provided * by Oracle in the LICENSE file that accompanied this code . * * This code is distributed in the hope that it will be useful , but WITHOUT * ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License * version 2 for more details ( a copy is included in the LICENSE file that * accompanied this code ) . * * You should have received a copy of the GNU General Public License version * 2 along with this work ; if not , write to the Free Software Foundation , * Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA . * * Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA * or visit www . oracle . com if you need additional information or have any * questions . /** * Provides the implementation of the DNS Java Naming provider . * * < h2 > Environment Properties < / h2 > * * < p > The following JNDI environment properties may be used when creating * the initial context . * * < ul > * < li > com . sun . jndi . dns . timeout . initial < / li > * < li > com . sun . jndi . dns . timeout . retries < / li > * < / ul > * * < p > These properties are used to alter the timeout - related defaults that the * DNS provider uses when submitting queries . The DNS provider submits queries * using the following exponential backoff algorithm . The provider submits a * query to a DNS server and waits for a response to arrive within a timeout * period ( 1 second by default ) . If it receives no response within the timeout * period , it queries the next server , and so on . If the provider receives no * response from any server , it doubles the timeout period and repeats the * process of submitting the query to each server , up to a maximum number of * retries ( 4 by default ) . * * < p > The { @ code com . sun . jndi . dns . timeout . initial } property , if set , specifies * the number of milliseconds to use as the initial timeout period ( i . e . , before * any doubling ) . If this property has not been set , the default initial timeout * is 1000 milliseconds . * * < p > The { @ code com . sun . jndi . dns . timeout . retries } property , if set , specifies * the number of times to retry each server using the exponential backoff * algorithm described previously . If this property has not been set , the * default number of retries is 4 . * * @ provides javax . naming . spi . InitialContextFactory * * @ moduleGraph * @ since 9 // temporary export until NamingManager.getURLContext uses services
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