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use crate::TransactionId;
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use std::time::Duration;
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/// Concurrent Modification Strategy for resolution of conflict on commit.
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///
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#[derive(PartialEq, Clone, Debug)]
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pub enum TxStrategy {
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8
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///
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/// Last modification received override all the previous modifications
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10
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///
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LastWin,
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12
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13
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///
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/// prepare_commit will fail if the persistent version is more recent of the version when
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/// the update_record/delete_record is executed
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///
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VersionOnWrite,
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///
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/// prepare_commit will fail if the persistent version is more recent of the version of the
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/// last read_record_tx, if no read_record_tx was called will fallow the same behaviour of
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/// VersionOnWrite
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///
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VersionOnRead,
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}
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impl Default for TxStrategy {
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fn default() -> Self {
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TxStrategy::LastWin
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}
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}
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impl TxStrategy {
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pub fn value(&self) -> u8 {
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match *self {
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TxStrategy::LastWin => 1,
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TxStrategy::VersionOnWrite => 2,
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TxStrategy::VersionOnRead => 3,
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}
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}
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pub fn from_value(val: u8) -> TxStrategy {
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match val {
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1 => TxStrategy::LastWin,
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0
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2 => TxStrategy::VersionOnWrite,
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0
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3 => TxStrategy::VersionOnRead,
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0
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_ => panic!("something went wrong in tx strategy serialization: {}", val),
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}
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1
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}
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}
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/// Persy configuration structure.
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///
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/// Lock are taken in order, should never go in deadlock so the default timeout is huge.
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/// Current default values:
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///
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/// cache_size = 32M
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/// transaction_lock_timeout = 1 Day
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/// concurrent_modification_strategy = LastWin
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///
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#[derive(Debug, Clone)]
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pub struct Config {
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cache_size: u64,
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transaction_lock_timeout: Duration,
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tx_strategy: TxStrategy,
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}
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impl Config {
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pub fn new() -> Config {
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Config {
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cache_size: 32 * 1024 * 1024,
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transaction_lock_timeout: Duration::new(24 * 60 * 60, 0),
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tx_strategy: TxStrategy::LastWin,
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}
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1
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}
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1
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pub fn cache_size(&self) -> u64 {
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self.cache_size
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1
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}
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1
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pub fn transaction_lock_timeout(&self) -> &Duration {
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80
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1
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&self.transaction_lock_timeout
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1
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}
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82
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pub fn change_cache_size(&mut self, cache_size: u64) {
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84
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self.cache_size = cache_size;
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85
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}
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86
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pub fn change_transaction_lock_timeout(&mut self, transaction_lock_timeout: Duration) {
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self.transaction_lock_timeout = transaction_lock_timeout;
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}
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pub fn tx_strategy(&self) -> &TxStrategy {
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&self.tx_strategy
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}
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95
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1
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pub fn change_tx_strategy(&mut self, strategy: TxStrategy) {
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self.tx_strategy = strategy;
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}
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}
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impl Default for Config {
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fn default() -> Self {
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102
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Self::new()
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103
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}
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}
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105
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106
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/// Configure the parameters for the transaction on the begin of a new transaction.
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107
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#[derive(Clone)]
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pub struct TransactionConfig {
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109
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pub(crate) tx_strategy: Option<TxStrategy>,
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pub(crate) background_sync: Option<bool>,
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111
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pub(crate) transaction_id: Option<TransactionId>,
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}
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113
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114
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impl TransactionConfig {
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115
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1
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pub fn new() -> Self {
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116
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1
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Self {
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117
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tx_strategy: None,
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118
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background_sync: None,
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119
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1
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transaction_id: None,
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120
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}
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121
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1
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}
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122
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/// Set the transaction concurrency checks, **experimental** use carefully
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123
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pub fn set_strategy(mut self, strategy: TxStrategy) -> Self {
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124
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self.tx_strategy = Some(strategy);
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125
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self
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126
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}
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127
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128
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/// Set if the transaction will be fsync-ed in background or on the current thread
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129
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/// this option is available only if the "background_ops" feature is enabled
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|
130
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#[cfg(feature = "background_ops")]
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131
|
1
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pub fn set_background_sync(mut self, background: bool) -> Self {
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|
132
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1
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self.background_sync = Some(background);
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133
|
1
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self
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134
|
1
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}
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135
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136
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/// Set the transaction id to be used in case of crash recovery.
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|
137
|
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pub fn set_transaction_id(mut self, transaction_id: TransactionId) -> Self {
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|
138
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self.transaction_id = Some(transaction_id);
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|
139
|
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self
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140
|
|
}
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|
141
|
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}
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