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package io.grpc;

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 */ final class ExponentialBackoffPolicy implements BackoffPolicy { static final class Provider implements BackoffPolicy.Provider { @Override public BackoffPolicy get() { return new ExponentialBackoffPolicy(); } } private Random random = new Random(); private long initialBackoffMillis = TimeUnit.SECONDS.toMillis(1); private long maxBackoffMillis = TimeUnit.MINUTES.toMillis(2); private double multiplier = 1.6; private double jitter = .2; private long nextBackoffMillis = initialBackoffMillis; @Override public long nextBackoffMillis() { long currentBackoffMillis = nextBackoffMillis; nextBackoffMillis = Math.min((long) (currentBackoffMillis * multiplier), maxBackoffMillis); return currentBackoffMillis + uniformRandom(-jitter * currentBackoffMillis, jitter * currentBackoffMillis); } 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 setInitialBackoffMillis(long initialBackoffMillis) { this.initialBackoffMillis = initialBackoffMillis; return this; } @VisibleForTesting ExponentialBackoffPolicy setMaxBackoffMillis(long maxBackoffMillis) { this.maxBackoffMillis = maxBackoffMillis; 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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