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| 1 | +package com.github.theholywaffle.teamspeak3.api.reconnect; |
| 2 | + |
| 3 | +public abstract class ReconnectStrategy { |
| 4 | + |
| 5 | + private static final int CONSTANT_BACKOFF = 10000; |
| 6 | + private static final int START_TIMEOUT = 1000; |
| 7 | + private static final int TIMEOUT_CAP = 60000; |
| 8 | + private static final int ADDEND = 2000; |
| 9 | + private static final double MULTIPLIER = 1.5; |
| 10 | + |
| 11 | + private ReconnectStrategy() {} |
| 12 | + |
| 13 | + public abstract ConnectionHandler create(ConnectionHandler userConnectionHandler); |
| 14 | + |
| 15 | + public static ReconnectStrategy userControlled() { |
| 16 | + return new UserControlled(); |
| 17 | + } |
| 18 | + |
| 19 | + public static ReconnectStrategy disconnect() { |
| 20 | + return new Disconnect(); |
| 21 | + } |
| 22 | + |
| 23 | + public static ReconnectStrategy constantBackoff() { |
| 24 | + return constantBackoff(CONSTANT_BACKOFF); |
| 25 | + } |
| 26 | + |
| 27 | + public static ReconnectStrategy constantBackoff(int timeout) { |
| 28 | + return new Constant(timeout); |
| 29 | + } |
| 30 | + |
| 31 | + public static ReconnectStrategy linearBackoff() { |
| 32 | + return linearBackoff(START_TIMEOUT, ADDEND, TIMEOUT_CAP); |
| 33 | + } |
| 34 | + |
| 35 | + public static ReconnectStrategy linearBackoff(int startTimeout, int addend) { |
| 36 | + return linearBackoff(startTimeout, addend, TIMEOUT_CAP); |
| 37 | + } |
| 38 | + |
| 39 | + public static ReconnectStrategy linearBackoff(int startTimeout, int addend, int timeoutCap) { |
| 40 | + return new Linear(startTimeout, addend, timeoutCap); |
| 41 | + } |
| 42 | + |
| 43 | + public static ReconnectStrategy exponentialBackoff() { |
| 44 | + return exponentialBackoff(START_TIMEOUT, MULTIPLIER, TIMEOUT_CAP); |
| 45 | + } |
| 46 | + |
| 47 | + public static ReconnectStrategy exponentialBackoff(int startTimeout, double multiplier) { |
| 48 | + return exponentialBackoff(startTimeout, multiplier, TIMEOUT_CAP); |
| 49 | + } |
| 50 | + |
| 51 | + public static ReconnectStrategy exponentialBackoff(int startTimeout, double multiplier, int timeoutCap) { |
| 52 | + return new Exponential(startTimeout, multiplier, timeoutCap); |
| 53 | + } |
| 54 | + |
| 55 | + private static class UserControlled extends ReconnectStrategy { |
| 56 | + |
| 57 | + @Override |
| 58 | + public ConnectionHandler create(ConnectionHandler userConnectionHandler) { |
| 59 | + String message = "userConnectionHandler cannot be null when using strategy UserControlled!"; |
| 60 | + if (userConnectionHandler == null) throw new NullPointerException(message); |
| 61 | + return userConnectionHandler; |
| 62 | + } |
| 63 | + } |
| 64 | + |
| 65 | + private static class Disconnect extends ReconnectStrategy { |
| 66 | + |
| 67 | + @Override |
| 68 | + public ConnectionHandler create(ConnectionHandler userConnectionHandler) { |
| 69 | + return new DisconnectingConnectionHandler(userConnectionHandler); |
| 70 | + } |
| 71 | + } |
| 72 | + |
| 73 | + private static class Constant extends ReconnectStrategy { |
| 74 | + |
| 75 | + private final int timeout; |
| 76 | + |
| 77 | + public Constant(int timeout) { |
| 78 | + if (timeout <= 0) throw new IllegalArgumentException("Timeout must be greater than 0"); |
| 79 | + |
| 80 | + this.timeout = timeout; |
| 81 | + } |
| 82 | + |
| 83 | + @Override |
| 84 | + public ConnectionHandler create(ConnectionHandler userConnectionHandler) { |
| 85 | + return new ReconnectingConnectionHandler(userConnectionHandler, timeout, timeout, 0, 1.0); |
| 86 | + } |
| 87 | + } |
| 88 | + |
| 89 | + private static class Linear extends ReconnectStrategy { |
| 90 | + |
| 91 | + private final int startTimeout; |
| 92 | + private final int addend; |
| 93 | + private final int timeoutCap; |
| 94 | + |
| 95 | + private Linear(int startTimeout, int addend, int timeoutCap) { |
| 96 | + if (startTimeout <= 0) throw new IllegalArgumentException("Starting timeout must be greater than 0"); |
| 97 | + if (addend <= 0) throw new IllegalArgumentException("Addend must be greater than 0"); |
| 98 | + |
| 99 | + this.startTimeout = startTimeout; |
| 100 | + this.addend = addend; |
| 101 | + this.timeoutCap = timeoutCap; |
| 102 | + } |
| 103 | + |
| 104 | + @Override |
| 105 | + public ConnectionHandler create(ConnectionHandler userConnectionHandler) { |
| 106 | + return new ReconnectingConnectionHandler(userConnectionHandler, startTimeout, timeoutCap, addend, 1.0); |
| 107 | + } |
| 108 | + } |
| 109 | + |
| 110 | + private static class Exponential extends ReconnectStrategy { |
| 111 | + |
| 112 | + private final int startTimeout; |
| 113 | + private final double multiplier; |
| 114 | + private final int timeoutCap; |
| 115 | + |
| 116 | + private Exponential(int startTimeout, double multiplier, int timeoutCap) { |
| 117 | + if (startTimeout <= 0) throw new IllegalArgumentException("Starting timeout must be greater than 0"); |
| 118 | + if (multiplier <= 1.0) throw new IllegalArgumentException("Multiplier must be greater than 1"); |
| 119 | + |
| 120 | + this.startTimeout = startTimeout; |
| 121 | + this.multiplier = multiplier; |
| 122 | + this.timeoutCap = timeoutCap; |
| 123 | + } |
| 124 | + |
| 125 | + @Override |
| 126 | + public ConnectionHandler create(ConnectionHandler userConnectionHandler) { |
| 127 | + return new ReconnectingConnectionHandler(userConnectionHandler, startTimeout, timeoutCap, 0, multiplier); |
| 128 | + } |
| 129 | + } |
| 130 | +} |
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