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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/httpd-2.2-proxy@774427 13f79535-47bb-0310-9956-ffa450edef68
122 lines
4.0 KiB
C
122 lines
4.0 KiB
C
/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mod_proxy.h"
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#include "scoreboard.h"
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#include "ap_mpm.h"
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#include "apr_version.h"
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#include "apr_hooks.h"
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static proxy_worker *find_best_bybusyness(proxy_balancer *balancer,
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request_rec *r)
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{
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int i;
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proxy_worker **worker;
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proxy_worker *mycandidate = NULL;
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int cur_lbset = 0;
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int max_lbset = 0;
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int checking_standby;
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int checked_standby;
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int total_factor = 0;
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: Entering bybusyness for BALANCER (%s)",
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balancer->name);
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/* First try to see if we have available candidate */
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do {
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checking_standby = checked_standby = 0;
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while (!mycandidate && !checked_standby) {
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worker = (proxy_worker **)balancer->workers->elts;
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for (i = 0; i < balancer->workers->nelts; i++, worker++) {
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if (!checking_standby) { /* first time through */
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if ((*worker)->s->lbset > max_lbset)
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max_lbset = (*worker)->s->lbset;
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}
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if ((*worker)->s->lbset != cur_lbset)
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continue;
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if ( (checking_standby ? !PROXY_WORKER_IS_STANDBY(*worker) : PROXY_WORKER_IS_STANDBY(*worker)) )
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continue;
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/* If the worker is in error state run
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* retry on that worker. It will be marked as
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* operational if the retry timeout is elapsed.
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* The worker might still be unusable, but we try
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* anyway.
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*/
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if (!PROXY_WORKER_IS_USABLE(*worker))
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ap_proxy_retry_worker("BALANCER", *worker, r->server);
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/* Take into calculation only the workers that are
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* not in error state or not disabled.
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*/
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if (PROXY_WORKER_IS_USABLE(*worker)) {
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(*worker)->s->lbstatus += (*worker)->s->lbfactor;
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total_factor += (*worker)->s->lbfactor;
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if (!mycandidate
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|| (*worker)->s->busy < mycandidate->s->busy
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|| ((*worker)->s->busy == mycandidate->s->busy && (*worker)->s->lbstatus > mycandidate->s->lbstatus))
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mycandidate = *worker;
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}
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}
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checked_standby = checking_standby++;
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}
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cur_lbset++;
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} while (cur_lbset <= max_lbset && !mycandidate);
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if (mycandidate) {
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mycandidate->s->lbstatus -= total_factor;
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ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, r->server,
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"proxy: bybusyness selected worker \"%s\" : busy %" APR_SIZE_T_FMT " : lbstatus %d",
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mycandidate->name, mycandidate->s->busy, mycandidate->s->lbstatus);
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}
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return mycandidate;
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}
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static apr_status_t reset(proxy_balancer *balancer, server_rec *s) {
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return APR_SUCCESS;
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}
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static apr_status_t age(proxy_balancer *balancer, server_rec *s) {
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return APR_SUCCESS;
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}
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const proxy_balancer_method proxy_balancer_bybusyness =
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{
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"bybusyness",
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&find_best_bybusyness,
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NULL,
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&reset,
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&age
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};
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