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EventJournal

rust_supervisor::journal::ring

Struct EventJournal 

Source 
pub struct EventJournal {
    pub capacity: usize,
    pub events: VecDeque<SupervisorEvent>,
    pub dropped_count: u64,
    pub last_sequence: Option<EventSequence>,
}
Expand description

Fixed-capacity lifecycle event journal.

Fields§

§capacity: usize

Maximum number of events retained in memory.

§events: VecDeque<SupervisorEvent>

Recent events in oldest-to-newest order.

§dropped_count: u64

Number of events dropped because capacity was full.

§last_sequence: Option<EventSequence>

Last sequence written to the journal.

Implementations§

Source§

impl EventJournal

Source

pub fn new(capacity: usize) -> Self

Creates an event journal with fixed capacity.

§Arguments
  • capacity: Maximum number of events retained. Zero is allowed and drops every pushed event.
§Returns

Returns an empty EventJournal.

§Examples
let journal = rust_supervisor::journal::ring::EventJournal::new(2);
assert_eq!(journal.capacity, 2);
Examples found in repository?
examples/diagnostic_replay.rs (line 65)
38fn main() {
39    // Build the child identifier.
40    let child_id = ChildId::new("market_feed");
41    // Build the child path.
42    let child_path = SupervisorPath::root().join("market_feed");
43    // Build a typed task failure.
44    let failure = TaskFailure::new(
45        // Set the failure kind.
46        TaskFailureKind::Timeout,
47        // Set the low-cardinality failure category.
48        "external_dependency",
49        // Set the diagnostic failure message.
50        "market feed heartbeat timed out",
51        // Finish the typed task failure.
52    );
53    // Build the restart policy decision.
54    let policy = PolicyDecision::new(
55        // Set the decision label.
56        "RestartAfter",
57        // Set the restart delay.
58        Some(500),
59        // Set the diagnostic decision reason.
60        Some("heartbeat timeout is restartable".to_owned()),
61        // Finish the policy decision.
62    );
63
64    // Create the fixed-capacity event journal.
65    let mut journal = EventJournal::new(8);
66    // Push the running event.
67    journal.push(event(
68        // Set the event sequence.
69        1,
70        // Clone the child identifier.
71        child_id.clone(),
72        // Set the child display name.
73        "Market Feed",
74        // Build the running event payload.
75        What::ChildRunning {
76            // Attach the state transition.
77            transition: Some(StateTransition::new("Starting", "Running")),
78            // Finish the running event payload.
79        },
80        // Attach no policy decision.
81        None,
82        // Finish the running event.
83    ));
84    // Push the failed event.
85    journal.push(event(
86        // Set the event sequence.
87        2,
88        // Clone the child identifier.
89        child_id.clone(),
90        // Set the child display name.
91        "Market Feed",
92        // Build the failed event payload.
93        What::ChildFailed {
94            // Attach the typed failure.
95            failure: failure.clone(),
96            // Finish the failed event payload.
97        },
98        // Attach the restart policy decision.
99        Some(policy.clone()),
100        // Finish the failed event.
101    ));
102    // Push the backoff event.
103    journal.push(event(
104        // Set the event sequence.
105        3,
106        // Clone the child identifier.
107        child_id.clone(),
108        // Set the child display name.
109        "Market Feed",
110        // Build the backoff payload.
111        What::BackoffScheduled { delay_ms: 500 },
112        // Attach the restart policy decision.
113        Some(policy.clone()),
114        // Finish the backoff event.
115    ));
116    // Push the restarted event.
117    journal.push(event(
118        // Set the event sequence.
119        4,
120        // Clone the child identifier.
121        child_id.clone(),
122        // Set the child display name.
123        "Market Feed",
124        // Build the restarted payload.
125        What::ChildRestarted { restart_count: 1 },
126        // Attach the restart policy decision.
127        Some(policy.clone()),
128        // Finish the restarted event.
129    ));
130
131    // Build the final child state.
132    let child = ChildState::declared(child_path, child_id, "Market Feed")
133        // Set the child lifecycle state.
134        .with_lifecycle_state(ChildLifecycleState::Running, EventSequence::new(1))
135        // Record the latest failure.
136        .record_failure(failure, EventSequence::new(2))
137        // Record the latest policy decision.
138        .with_policy_decision(policy, 1);
139    // Build the final supervisor state.
140    let final_state = SupervisorState::new(SupervisorPath::root(), EventSequence::new(4), 1)
141        // Add the child state.
142        .with_child(child)
143        // Mark shutdown as completed for the replay.
144        .with_shutdown_state(ShutdownState::Completed)
145        // Attach the last journal sequence.
146        .with_journal_sequence(EventSequence::new(4));
147    // Build the diagnostic run summary.
148    let summary = RunSummaryBuilder::new(8).build(
149        // Read recent events from the journal.
150        &journal,
151        // Attach the final current state.
152        final_state,
153        // Attach the shutdown cause.
154        Some("diagnostic replay complete".to_owned()),
155        // Finish the summary construction.
156    );
157    // Create the metrics facade.
158    let metrics = MetricsFacade::new();
159
160    // Print summary counters.
161    println!(
162        // Provide the output template.
163        "summary restart_count={} failure_count={} recent_events={}",
164        // Print the restart count.
165        summary.restart_count,
166        // Print the failure count.
167        summary.failure_count,
168        // Print the recent event count.
169        summary.recent_events.len(),
170        // Finish summary output.
171    );
172    // Iterate over recent journal events.
173    for event in journal.recent(8) {
174        // Print event names and derived metrics.
175        println!(
176            // Provide the output template.
177            "event={} metrics={:?}",
178            // Print the event name.
179            event.what.name(),
180            // Print metrics derived from the event.
181            metrics.samples_for_event(&event),
182            // Finish event output.
183        );
184        // Finish the journal replay loop.
185    }
186    // End the diagnostic replay example.
187}
Source

pub fn push(&mut self, event: SupervisorEvent) -> u64

Pushes an event and drops the oldest event when full.

§Arguments
  • event: Event that should be retained when capacity permits.
§Returns

Returns the new dropped count.

Examples found in repository?
examples/diagnostic_replay.rs (lines 67-83)
38fn main() {
39    // Build the child identifier.
40    let child_id = ChildId::new("market_feed");
41    // Build the child path.
42    let child_path = SupervisorPath::root().join("market_feed");
43    // Build a typed task failure.
44    let failure = TaskFailure::new(
45        // Set the failure kind.
46        TaskFailureKind::Timeout,
47        // Set the low-cardinality failure category.
48        "external_dependency",
49        // Set the diagnostic failure message.
50        "market feed heartbeat timed out",
51        // Finish the typed task failure.
52    );
53    // Build the restart policy decision.
54    let policy = PolicyDecision::new(
55        // Set the decision label.
56        "RestartAfter",
57        // Set the restart delay.
58        Some(500),
59        // Set the diagnostic decision reason.
60        Some("heartbeat timeout is restartable".to_owned()),
61        // Finish the policy decision.
62    );
63
64    // Create the fixed-capacity event journal.
65    let mut journal = EventJournal::new(8);
66    // Push the running event.
67    journal.push(event(
68        // Set the event sequence.
69        1,
70        // Clone the child identifier.
71        child_id.clone(),
72        // Set the child display name.
73        "Market Feed",
74        // Build the running event payload.
75        What::ChildRunning {
76            // Attach the state transition.
77            transition: Some(StateTransition::new("Starting", "Running")),
78            // Finish the running event payload.
79        },
80        // Attach no policy decision.
81        None,
82        // Finish the running event.
83    ));
84    // Push the failed event.
85    journal.push(event(
86        // Set the event sequence.
87        2,
88        // Clone the child identifier.
89        child_id.clone(),
90        // Set the child display name.
91        "Market Feed",
92        // Build the failed event payload.
93        What::ChildFailed {
94            // Attach the typed failure.
95            failure: failure.clone(),
96            // Finish the failed event payload.
97        },
98        // Attach the restart policy decision.
99        Some(policy.clone()),
100        // Finish the failed event.
101    ));
102    // Push the backoff event.
103    journal.push(event(
104        // Set the event sequence.
105        3,
106        // Clone the child identifier.
107        child_id.clone(),
108        // Set the child display name.
109        "Market Feed",
110        // Build the backoff payload.
111        What::BackoffScheduled { delay_ms: 500 },
112        // Attach the restart policy decision.
113        Some(policy.clone()),
114        // Finish the backoff event.
115    ));
116    // Push the restarted event.
117    journal.push(event(
118        // Set the event sequence.
119        4,
120        // Clone the child identifier.
121        child_id.clone(),
122        // Set the child display name.
123        "Market Feed",
124        // Build the restarted payload.
125        What::ChildRestarted { restart_count: 1 },
126        // Attach the restart policy decision.
127        Some(policy.clone()),
128        // Finish the restarted event.
129    ));
130
131    // Build the final child state.
132    let child = ChildState::declared(child_path, child_id, "Market Feed")
133        // Set the child lifecycle state.
134        .with_lifecycle_state(ChildLifecycleState::Running, EventSequence::new(1))
135        // Record the latest failure.
136        .record_failure(failure, EventSequence::new(2))
137        // Record the latest policy decision.
138        .with_policy_decision(policy, 1);
139    // Build the final supervisor state.
140    let final_state = SupervisorState::new(SupervisorPath::root(), EventSequence::new(4), 1)
141        // Add the child state.
142        .with_child(child)
143        // Mark shutdown as completed for the replay.
144        .with_shutdown_state(ShutdownState::Completed)
145        // Attach the last journal sequence.
146        .with_journal_sequence(EventSequence::new(4));
147    // Build the diagnostic run summary.
148    let summary = RunSummaryBuilder::new(8).build(
149        // Read recent events from the journal.
150        &journal,
151        // Attach the final current state.
152        final_state,
153        // Attach the shutdown cause.
154        Some("diagnostic replay complete".to_owned()),
155        // Finish the summary construction.
156    );
157    // Create the metrics facade.
158    let metrics = MetricsFacade::new();
159
160    // Print summary counters.
161    println!(
162        // Provide the output template.
163        "summary restart_count={} failure_count={} recent_events={}",
164        // Print the restart count.
165        summary.restart_count,
166        // Print the failure count.
167        summary.failure_count,
168        // Print the recent event count.
169        summary.recent_events.len(),
170        // Finish summary output.
171    );
172    // Iterate over recent journal events.
173    for event in journal.recent(8) {
174        // Print event names and derived metrics.
175        println!(
176            // Provide the output template.
177            "event={} metrics={:?}",
178            // Print the event name.
179            event.what.name(),
180            // Print metrics derived from the event.
181            metrics.samples_for_event(&event),
182            // Finish event output.
183        );
184        // Finish the journal replay loop.
185    }
186    // End the diagnostic replay example.
187}
Source

pub fn recent(&self, limit: usize) -> Vec<SupervisorEvent>

Returns recent events with newest events retained.

§Arguments
  • limit: Maximum number of events to return.
§Returns

Returns events in oldest-to-newest order.

§Examples
let journal = rust_supervisor::journal::ring::EventJournal::new(4);
assert!(journal.recent(2).is_empty());
Examples found in repository?
examples/diagnostic_replay.rs (line 173)
38fn main() {
39    // Build the child identifier.
40    let child_id = ChildId::new("market_feed");
41    // Build the child path.
42    let child_path = SupervisorPath::root().join("market_feed");
43    // Build a typed task failure.
44    let failure = TaskFailure::new(
45        // Set the failure kind.
46        TaskFailureKind::Timeout,
47        // Set the low-cardinality failure category.
48        "external_dependency",
49        // Set the diagnostic failure message.
50        "market feed heartbeat timed out",
51        // Finish the typed task failure.
52    );
53    // Build the restart policy decision.
54    let policy = PolicyDecision::new(
55        // Set the decision label.
56        "RestartAfter",
57        // Set the restart delay.
58        Some(500),
59        // Set the diagnostic decision reason.
60        Some("heartbeat timeout is restartable".to_owned()),
61        // Finish the policy decision.
62    );
63
64    // Create the fixed-capacity event journal.
65    let mut journal = EventJournal::new(8);
66    // Push the running event.
67    journal.push(event(
68        // Set the event sequence.
69        1,
70        // Clone the child identifier.
71        child_id.clone(),
72        // Set the child display name.
73        "Market Feed",
74        // Build the running event payload.
75        What::ChildRunning {
76            // Attach the state transition.
77            transition: Some(StateTransition::new("Starting", "Running")),
78            // Finish the running event payload.
79        },
80        // Attach no policy decision.
81        None,
82        // Finish the running event.
83    ));
84    // Push the failed event.
85    journal.push(event(
86        // Set the event sequence.
87        2,
88        // Clone the child identifier.
89        child_id.clone(),
90        // Set the child display name.
91        "Market Feed",
92        // Build the failed event payload.
93        What::ChildFailed {
94            // Attach the typed failure.
95            failure: failure.clone(),
96            // Finish the failed event payload.
97        },
98        // Attach the restart policy decision.
99        Some(policy.clone()),
100        // Finish the failed event.
101    ));
102    // Push the backoff event.
103    journal.push(event(
104        // Set the event sequence.
105        3,
106        // Clone the child identifier.
107        child_id.clone(),
108        // Set the child display name.
109        "Market Feed",
110        // Build the backoff payload.
111        What::BackoffScheduled { delay_ms: 500 },
112        // Attach the restart policy decision.
113        Some(policy.clone()),
114        // Finish the backoff event.
115    ));
116    // Push the restarted event.
117    journal.push(event(
118        // Set the event sequence.
119        4,
120        // Clone the child identifier.
121        child_id.clone(),
122        // Set the child display name.
123        "Market Feed",
124        // Build the restarted payload.
125        What::ChildRestarted { restart_count: 1 },
126        // Attach the restart policy decision.
127        Some(policy.clone()),
128        // Finish the restarted event.
129    ));
130
131    // Build the final child state.
132    let child = ChildState::declared(child_path, child_id, "Market Feed")
133        // Set the child lifecycle state.
134        .with_lifecycle_state(ChildLifecycleState::Running, EventSequence::new(1))
135        // Record the latest failure.
136        .record_failure(failure, EventSequence::new(2))
137        // Record the latest policy decision.
138        .with_policy_decision(policy, 1);
139    // Build the final supervisor state.
140    let final_state = SupervisorState::new(SupervisorPath::root(), EventSequence::new(4), 1)
141        // Add the child state.
142        .with_child(child)
143        // Mark shutdown as completed for the replay.
144        .with_shutdown_state(ShutdownState::Completed)
145        // Attach the last journal sequence.
146        .with_journal_sequence(EventSequence::new(4));
147    // Build the diagnostic run summary.
148    let summary = RunSummaryBuilder::new(8).build(
149        // Read recent events from the journal.
150        &journal,
151        // Attach the final current state.
152        final_state,
153        // Attach the shutdown cause.
154        Some("diagnostic replay complete".to_owned()),
155        // Finish the summary construction.
156    );
157    // Create the metrics facade.
158    let metrics = MetricsFacade::new();
159
160    // Print summary counters.
161    println!(
162        // Provide the output template.
163        "summary restart_count={} failure_count={} recent_events={}",
164        // Print the restart count.
165        summary.restart_count,
166        // Print the failure count.
167        summary.failure_count,
168        // Print the recent event count.
169        summary.recent_events.len(),
170        // Finish summary output.
171    );
172    // Iterate over recent journal events.
173    for event in journal.recent(8) {
174        // Print event names and derived metrics.
175        println!(
176            // Provide the output template.
177            "event={} metrics={:?}",
178            // Print the event name.
179            event.what.name(),
180            // Print metrics derived from the event.
181            metrics.samples_for_event(&event),
182            // Finish event output.
183        );
184        // Finish the journal replay loop.
185    }
186    // End the diagnostic replay example.
187}
Source

pub fn len(&self) -> usize

Returns the number of retained events.

§Arguments

This function has no arguments.

§Returns

Returns the current event count.

Source

pub fn is_empty(&self) -> bool

Reports whether the journal has no retained events.

§Arguments

This function has no arguments.

§Returns

Returns true when the journal is empty.

Trait Implementations§

Source§

impl Clone for EventJournal

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fn clone(&self) -> EventJournal

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for EventJournal

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for EventJournal

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl PartialEq for EventJournal

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fn eq(&self, other: &EventJournal) -> bool

Tests for self and other values to be equal, and is used by ==.
1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Serialize for EventJournal

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Eq for EventJournal

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impl StructuralPartialEq for EventJournal

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Returns self with the bg() set to [Color :: Red].

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Returns self with the bg() set to [Color :: Green].

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Returns self with the bg() set to [Color :: Yellow].

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Returns self with the bg() set to [Color :: Blue].

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Returns self with the bg() set to [Color :: Magenta].

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Returns self with the bg() set to [Color :: Cyan].

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Returns self with the bg() set to [Color :: White].

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Returns self with the bg() set to [Color :: BrightBlack].

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Returns self with the bg() set to [Color :: BrightRed].

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Returns self with the bg() set to [Color :: BrightGreen].

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Returns self with the bg() set to [Color :: BrightYellow].

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Returns self with the bg() set to [Color :: BrightBlue].

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fn on_bright_magenta(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightMagenta].

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Returns self with the bg() set to [Color :: BrightCyan].

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fn on_bright_white(&self) -> Painted<&T>

Returns self with the bg() set to [Color :: BrightWhite].

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fn attr(&self, value: Attribute) -> Painted<&T>

Enables the styling Attribute value.

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Returns self with the attr() set to [Attribute :: Bold].

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Returns self with the attr() set to [Attribute :: Dim].

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Returns self with the attr() set to [Attribute :: Invert].

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Returns self with the attr() set to [Attribute :: Conceal].

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Returns self with the attr() set to [Attribute :: Strike].

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Enables the yansi Quirk value.

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fn clear(&self) -> Painted<&T>

👎Deprecated since 1.0.1:

renamed to resetting() due to conflicts with Vec::clear(). The clear() method will be removed in a future release.

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Returns self with the quirk() set to [Quirk :: Resetting].

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Returns self with the quirk() set to [Quirk :: Bright].

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fn whenever(&self, value: Condition) -> Painted<&T>

Conditionally enable styling based on whether the Condition value applies. Replaces any previous condition.

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Enable styling painted only when both stdout and stderr are TTYs:

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where Self: Sized,

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type Error = Infallible

The type returned in the event of a conversion error.
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Performs the conversion.
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The type returned in the event of a conversion error.
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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,