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+/*
+ * $HeadURL: $
+ * $Revision: $
+ * $Date: $
+ *
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package org.apache.http.impl.client;
+
+import org.apache.http.HeaderElement;
+import org.apache.http.HeaderElementIterator;
+import org.apache.http.HttpResponse;
+import org.apache.http.conn.ConnectionKeepAliveStrategy;
+import org.apache.http.message.BasicHeaderElementIterator;
+import org.apache.http.protocol.HTTP;
+import org.apache.http.protocol.HttpContext;
+
+/**
+ * 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.
+ *
+ * @author <a href="mailto:sberlin at gmail.com">Sam Berlin</a>
+ *
+ * @version $Revision: $
+ *
+ * @since 4.0
+ */
+public class DefaultConnectionKeepAliveStrategy implements ConnectionKeepAliveStrategy {
+
+ public long getKeepAliveDuration(HttpResponse response, HttpContext context) {
+ if (response == null) {
+ throw new IllegalArgumentException("HTTP response may not be null");
+ }
+ HeaderElementIterator it = new BasicHeaderElementIterator(
+ response.headerIterator(HTTP.CONN_KEEP_ALIVE));
+ while (it.hasNext()) {
+ HeaderElement he = it.nextElement();
+ String param = he.getName();
+ String value = he.getValue();
+ if (value != null && param.equalsIgnoreCase("timeout")) {
+ try {
+ return Long.parseLong(value) * 1000;
+ } catch(NumberFormatException ignore) {
+ }
+ }
+ }
+ return -1;
+ }
+
+}