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/*
 * Copyright 2015 The 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.
 */

package io.grpc.internal;

import static com.google.common.base.Preconditions.checkArgument;

import com.google.common.annotations.VisibleForTesting;
import java.util.Random;
import java.util.concurrent.TimeUnit;

/**
 * Retry Policy for Transport reconnection.  Initial parameters from
 * https://github.com/grpc/grpc/blob/master/doc/connection-backoff.md
 *
 * 

TODO(carl-mastrangelo): add unit tests for this class */ public final class ExponentialBackoffPolicy implements BackoffPolicy { public static final class Provider implements BackoffPolicy.Provider { @Override public BackoffPolicy get() { return new ExponentialBackoffPolicy(); } } private Random random = new Random(); private long initialBackoffNanos = TimeUnit.SECONDS.toNanos(1); private long maxBackoffNanos = TimeUnit.MINUTES.toNanos(2); private double multiplier = 1.6; private double jitter = .2; private long nextBackoffNanos = initialBackoffNanos; @Override public long nextBackoffNanos() { long currentBackoffNanos = nextBackoffNanos; nextBackoffNanos = Math.min((long) (currentBackoffNanos * multiplier), maxBackoffNanos); return currentBackoffNanos + uniformRandom(-jitter * currentBackoffNanos, jitter * currentBackoffNanos); } private long uniformRandom(double low, double high) { checkArgument(high >= low); double mag = high - low; return (long) (random.nextDouble() * mag + low); } /* * No guice and no flags means we get to implement these setters for testing ourselves. Do not * call these from non-test code. */ @VisibleForTesting ExponentialBackoffPolicy setRandom(Random random) { this.random = random; return this; } @VisibleForTesting ExponentialBackoffPolicy setInitialBackoffNanos(long initialBackoffNanos) { this.initialBackoffNanos = initialBackoffNanos; return this; } @VisibleForTesting ExponentialBackoffPolicy setMaxBackoffNanos(long maxBackoffNanos) { this.maxBackoffNanos = maxBackoffNanos; return this; } @VisibleForTesting ExponentialBackoffPolicy setMultiplier(double multiplier) { this.multiplier = multiplier; return this; } @VisibleForTesting ExponentialBackoffPolicy setJitter(double jitter) { this.jitter = jitter; return this; } }





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