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package org.apache.hc.client5.http.impl;

import java.util.Iterator;

import org.apache.hc.client5.http.ConnectionKeepAliveStrategy;
import org.apache.hc.client5.http.config.RequestConfig;
import org.apache.hc.client5.http.protocol.HttpClientContext;
import org.apache.hc.core5.annotation.Contract;
import org.apache.hc.core5.annotation.ThreadingBehavior;
import org.apache.hc.core5.http.HeaderElement;
import org.apache.hc.core5.http.HeaderElements;
import org.apache.hc.core5.http.HttpResponse;
import org.apache.hc.core5.http.message.MessageSupport;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.util.Args;
import org.apache.hc.core5.util.TimeValue;

/**
 * Default implementation of a strategy deciding duration
 * that a connection can remain idle.
 * 

* The default implementation looks solely at the 'Keep-Alive' * header's timeout token. *

* * @since 4.0 */ @Contract(threading = ThreadingBehavior.STATELESS) public class DefaultConnectionKeepAliveStrategy implements ConnectionKeepAliveStrategy { /** * Default instance of {@link DefaultConnectionKeepAliveStrategy}. */ public static final DefaultConnectionKeepAliveStrategy INSTANCE = new DefaultConnectionKeepAliveStrategy(); @Override public TimeValue getKeepAliveDuration(final HttpResponse response, final HttpContext context) { Args.notNull(response, "HTTP response"); final Iterator it = MessageSupport.iterate(response, HeaderElements.KEEP_ALIVE); while (it.hasNext()) { final HeaderElement he = it.next(); final String param = he.getName(); final String value = he.getValue(); if (value != null && param.equalsIgnoreCase("timeout")) { try { return TimeValue.ofSeconds(Long.parseLong(value)); } catch(final NumberFormatException ignore) { } } } final HttpClientContext clientContext = HttpClientContext.cast(context); final RequestConfig requestConfig = clientContext.getRequestConfigOrDefault(); return requestConfig.getConnectionKeepAlive(); } }




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