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							- /*
 
-  *
 
-  * Copyright 2016 gRPC authors.
 
-  *
 
-  * 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/core/lib/support/backoff.h"
 
- #include <grpc/support/log.h>
 
- #include "test/core/util/test_config.h"
 
- static void test_constant_backoff(void) {
 
-   gpr_backoff backoff;
 
-   gpr_backoff_init(&backoff, 200 /* initial timeout */, 1.0 /* multiplier */,
 
-                    0.0 /* jitter */, 100 /* min timeout */,
 
-                    1000 /* max timeout */);
 
-   gpr_timespec now = gpr_time_0(GPR_TIMESPAN);
 
-   gpr_timespec next = gpr_backoff_begin(&backoff, now);
 
-   GPR_ASSERT(gpr_time_to_millis(gpr_time_sub(next, now)) == 200);
 
-   for (int i = 0; i < 10000; i++) {
 
-     next = gpr_backoff_step(&backoff, now);
 
-     GPR_ASSERT(gpr_time_to_millis(gpr_time_sub(next, now)) == 200);
 
-     now = next;
 
-   }
 
- }
 
- static void test_min_connect(void) {
 
-   gpr_backoff backoff;
 
-   gpr_backoff_init(&backoff, 100 /* initial timeout */, 1.0 /* multiplier */,
 
-                    0.0 /* jitter */, 200 /* min timeout */,
 
-                    1000 /* max timeout */);
 
-   gpr_timespec now = gpr_time_0(GPR_TIMESPAN);
 
-   gpr_timespec next = gpr_backoff_begin(&backoff, now);
 
-   GPR_ASSERT(gpr_time_to_millis(gpr_time_sub(next, now)) == 200);
 
- }
 
- static void test_no_jitter_backoff(void) {
 
-   gpr_backoff backoff;
 
-   gpr_backoff_init(&backoff, 2 /* initial timeout */, 2.0 /* multiplier */,
 
-                    0.0 /* jitter */, 1 /* min timeout */,
 
-                    513 /* max timeout */);
 
-   // x_1 = 2
 
-   // x_n = 2**i + x_{i-1} ( = 2**(n+1) - 2 )
 
-   gpr_timespec now = gpr_time_0(GPR_TIMESPAN);
 
-   gpr_timespec next = gpr_backoff_begin(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(2, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(6, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(14, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(30, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(62, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(126, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(254, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(510, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(1022, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   // Hit the maximum timeout. From this point onwards, retries will increase
 
-   // only by max timeout.
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(1535, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(2048, GPR_TIMESPAN), next) == 0);
 
-   now = next;
 
-   next = gpr_backoff_step(&backoff, now);
 
-   GPR_ASSERT(gpr_time_cmp(gpr_time_from_millis(2561, GPR_TIMESPAN), next) == 0);
 
- }
 
- static void test_jitter_backoff(void) {
 
-   const int64_t initial_timeout = 500;
 
-   const double jitter = 0.1;
 
-   gpr_backoff backoff;
 
-   gpr_backoff_init(&backoff, initial_timeout, 1.0 /* multiplier */, jitter,
 
-                    100 /* min timeout */, 1000 /* max timeout */);
 
-   backoff.rng_state = 0;  // force consistent PRNG
 
-   gpr_timespec now = gpr_time_0(GPR_TIMESPAN);
 
-   gpr_timespec next = gpr_backoff_begin(&backoff, now);
 
-   GPR_ASSERT(gpr_time_to_millis(gpr_time_sub(next, now)) == 500);
 
-   int64_t expected_next_lower_bound =
 
-       (int64_t)((double)initial_timeout * (1 - jitter));
 
-   int64_t expected_next_upper_bound =
 
-       (int64_t)((double)initial_timeout * (1 + jitter));
 
-   for (int i = 0; i < 10000; i++) {
 
-     next = gpr_backoff_step(&backoff, now);
 
-     // next-now must be within (jitter*100)% of the previous timeout.
 
-     const int64_t timeout_millis = gpr_time_to_millis(gpr_time_sub(next, now));
 
-     GPR_ASSERT(timeout_millis >= expected_next_lower_bound);
 
-     GPR_ASSERT(timeout_millis <= expected_next_upper_bound);
 
-     expected_next_lower_bound =
 
-         (int64_t)((double)timeout_millis * (1 - jitter));
 
-     expected_next_upper_bound =
 
-         (int64_t)((double)timeout_millis * (1 + jitter));
 
-     now = next;
 
-   }
 
- }
 
- int main(int argc, char **argv) {
 
-   grpc_test_init(argc, argv);
 
-   gpr_time_init();
 
-   test_constant_backoff();
 
-   test_min_connect();
 
-   test_no_jitter_backoff();
 
-   test_jitter_backoff();
 
-   return 0;
 
- }
 
 
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