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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed 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.
*/
#include <src/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <parc/assert/parc_Assert.h>
#include <parc/algol/parc_HashMap.h>
#include <parc/algol/parc_Memory.h>
#include <src/strategies/rnd.h>
static void _strategyRnd_ReceiveObject(StrategyImpl *strategy,
const NumberSet *egressId,
const Message *objectMessage, Ticks rtt);
static void _strategyRnd_OnTimeout(StrategyImpl *strategy,
const NumberSet *egressId);
static NumberSet *_strategyRnd_LookupNexthop(StrategyImpl *strategy,
const Message *interestMessage);
static NumberSet *_strategyRnd_ReturnNexthops(StrategyImpl *strategy);
static unsigned _strategyRnd_CountNexthops(StrategyImpl *strategy);
static void _strategyRnd_AddNexthop(StrategyImpl *strategy,
unsigned connectionId);
static void _strategyRnd_RemoveNexthop(StrategyImpl *strategy,
unsigned connectionId);
static void _strategyRnd_ImplDestroy(StrategyImpl **strategyPtr);
static strategy_type _strategyRnd_GetStrategy(StrategyImpl *strategy);
static StrategyImpl _template = {
.context = NULL,
.receiveObject = &_strategyRnd_ReceiveObject,
.onTimeout = &_strategyRnd_OnTimeout,
.lookupNexthop = &_strategyRnd_LookupNexthop,
.returnNexthops = &_strategyRnd_ReturnNexthops,
.countNexthops = &_strategyRnd_CountNexthops,
.addNexthop = &_strategyRnd_AddNexthop,
.removeNexthop = &_strategyRnd_RemoveNexthop,
.destroy = &_strategyRnd_ImplDestroy,
.getStrategy = &_strategyRnd_GetStrategy,
};
struct strategy_rnd;
typedef struct strategy_rnd StrategyRnd;
struct strategy_rnd {
NumberSet *nexthops;
};
StrategyImpl *strategyRnd_Create() {
StrategyRnd *strategy = parcMemory_AllocateAndClear(sizeof(StrategyRnd));
parcAssertNotNull(strategy, "parcMemory_AllocateAndClear(%zu) returned NULL",
sizeof(StrategyRnd));
strategy->nexthops = numberSet_Create();
srand(time(NULL));
StrategyImpl *impl = parcMemory_AllocateAndClear(sizeof(StrategyImpl));
parcAssertNotNull(impl, "parcMemory_AllocateAndClear(%zu) returned NULL",
sizeof(StrategyImpl));
memcpy(impl, &_template, sizeof(StrategyImpl));
impl->context = strategy;
return impl;
}
// =======================================================
// Dispatch API
strategy_type _strategyRnd_GetStrategy(StrategyImpl *strategy) {
return SET_STRATEGY_RANDOM;
}
static int _select_Nexthop(StrategyRnd *strategy) {
unsigned len = numberSet_Length(strategy->nexthops);
if (len == 0) {
return -1;
}
int rnd = (rand() % len);
return numberSet_GetItem(strategy->nexthops, rnd);
}
static void _strategyRnd_ReceiveObject(StrategyImpl *strategy,
const NumberSet *egressId,
const Message *objectMessage,
Ticks rtt) {}
static void _strategyRnd_OnTimeout(StrategyImpl *strategy,
const NumberSet *egressId) {}
static NumberSet *_strategyRnd_LookupNexthop(StrategyImpl *strategy,
const Message *interestMessage) {
StrategyRnd *srnd = (StrategyRnd *)strategy->context;
unsigned in_connection = message_GetIngressConnectionId(interestMessage);
unsigned nexthopSize = numberSet_Length(srnd->nexthops);
NumberSet *out = numberSet_Create();
if ((nexthopSize == 0) ||
((nexthopSize == 1) &&
numberSet_Contains(srnd->nexthops, in_connection))) {
// there are no output faces or the input face is also the only output face.
// return null to avoid loops
return out;
}
unsigned out_connection;
do {
out_connection = _select_Nexthop(srnd);
} while (out_connection == in_connection);
if (out_connection == -1) {
return out;
}
numberSet_Add(out, out_connection);
return out;
}
static NumberSet *_strategyRnd_ReturnNexthops(StrategyImpl *strategy) {
StrategyRnd *srnd = (StrategyRnd *)strategy->context;
return srnd->nexthops;
}
unsigned _strategyRnd_CountNexthops(StrategyImpl *strategy) {
StrategyRnd *srnd = (StrategyRnd *)strategy->context;
return numberSet_Length(srnd->nexthops);
}
static void _strategyRnd_AddNexthop(StrategyImpl *strategy,
unsigned connectionId) {
StrategyRnd *srnd = (StrategyRnd *)strategy->context;
if (!numberSet_Contains(srnd->nexthops, connectionId)) {
numberSet_Add(srnd->nexthops, connectionId);
}
}
static void _strategyRnd_RemoveNexthop(StrategyImpl *strategy,
unsigned connectionId) {
StrategyRnd *srnd = (StrategyRnd *)strategy->context;
if (numberSet_Contains(srnd->nexthops, connectionId)) {
numberSet_Remove(srnd->nexthops, connectionId);
}
}
static void _strategyRnd_ImplDestroy(StrategyImpl **strategyPtr) {
parcAssertNotNull(strategyPtr, "Parameter must be non-null double pointer");
parcAssertNotNull(*strategyPtr,
"Parameter must dereference to non-null pointer");
StrategyImpl *impl = *strategyPtr;
StrategyRnd *strategy = (StrategyRnd *)impl->context;
numberSet_Release(&(strategy->nexthops));
parcMemory_Deallocate((void **)&strategy);
parcMemory_Deallocate((void **)&impl);
*strategyPtr = NULL;
}
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