Description
Generate sampled enqueue, dequeue and peek operations with front-to-back FIFO snapshots, deliberate empty-queue controls and a chunked final queue view.
An operation trace pairs an ordered request stream with the state after each step. Empty operations, ties, evictions, and boundary indexes are part of the modeled contract rather than incidental display details.
Generate sampled enqueue, dequeue and peek operations with front-to-back FIFO snapshots, deliberate empty-queue controls and a chunked final queue view.
When to use this tool
Use this generator to create reproducible queue operation trace cases from the supplied model or bank. Inspect the returned evidence before using cases in a test or exercise.
How to use the tool and how it works
- Supply initialValues, values, operations, eventCount, pageSize in the field shapes below. Set seed when you need an explicit replay.
- Run the tool and correct any input error. For generated controls, distinguish a successful fixture containing an invalid case from failure to generate the fixture.
- Read events, finalQueue, finalPages. Use the conventions below and keep answer-bearing fields separate when presenting an exercise.
Sample enqueue, dequeue, and peek operations. Enqueue draws a supplied value; dequeue removes the front and peek reads it. Return front-to-back snapshots, explicit underflow with null values, and the final queue chunked by pageSize.1
Delegated operations used for this result: chunk. Their calculation or parsing conventions apply to the corresponding result fields.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| initialValues | Initial Values | Required. Array of Text; maximum UTF-16 length 64.; minimum items 0; maximum items 16. |
| values | Values | Required. Array of Text; maximum UTF-16 length 64.; minimum items 1; maximum items 16. |
| operations | Operations | Required. Array of Text; one of "enqueue", "dequeue", "peek".; minimum items 1; maximum items 3. |
| eventCount | Event Count | Required. Safe integer; minimum 1; maximum 64. |
| pageSize | Page Size | Required. Safe integer; minimum 1; maximum 16. |
| seed | Optional numeric seed; takes precedence over context randomness. Without either, use the fixed tool.io default seed. | Optional. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| events | Events | Required. Array of Object; no unknown keys.; minimum items 0; maximum items 64. |
| events[].kind | Kind | Required. Text; one of "enqueue", "dequeue", "peek". |
| events[].value | Value | Required. Text; maximum UTF-16 length 64. or Null. |
| events[].underflow | Underflow | Required. Boolean. |
| events[].queue | Queue | Required. Array of Text; maximum UTF-16 length 64.; minimum items 0; maximum items 80. |
| finalQueue | Final Queue | Required. Array of Text; maximum UTF-16 length 64.; minimum items 0; maximum items 80. |
| finalPages | Final Pages | Required. Array of Array of Text; maximum UTF-16 length 64.; minimum items 1; maximum items 16.; minimum items 0; maximum items 80. |
| randomness | Replay metadata: source is seed or context; seed is the normalized 32-bit seed or null for a context source. | Required. Object; no unknown keys. |
| randomness.seed | Optional numeric replay seed; normalization and precedence are explained below. | Required. Safe integer. or Null. |
| randomness.source | Source | Required. Text; one of "context", "seed". |
An explicit safe-integer seed takes precedence over injected context randomness and is normalized to an unsigned 32-bit integer. With no seed and no context source, replay uses the fixed tool.io default seed. A context source must return finite values from zero inclusive to one exclusive; its advancing state must be retained separately. randomness records the source and normalized seed, or null for context. These generators are not cryptographic random sources.
{
"input": {
"initialValues": [
"a",
"b"
],
"values": [
"c",
"d"
],
"operations": [
"enqueue",
"dequeue",
"peek"
],
"eventCount": 5,
"pageSize": 2,
"seed": 42
},
"output": {
"events": [
{
"kind": "dequeue",
"value": "a",
"underflow": false,
"queue": [
"b"
]
},
{
"kind": "dequeue",
"value": "b",
"underflow": false,
"queue": []
},
{
"kind": "peek",
"value": null,
"underflow": true,
"queue": []
},
{
"kind": "peek",
"value": null,
"underflow": true,
"queue": []
},
{
"kind": "enqueue",
"value": "d",
"underflow": false,
"queue": [
"d"
]
}
],
"finalQueue": [
"d"
],
"finalPages": [
[
"d"
]
],
"randomness": {
"seed": 42,
"source": "seed"
}
}
}Limitations and assumptions
- Empty reads remain intentional trace events. Snapshot work is bounded, and chunking groups the final queue without simulating a paged or concurrent storage system.
- A replay requires the same complete input and implementation. Randomized construction does not guarantee uniform coverage of every feasible output; finite samples can repeat unless a distinct-selection rule is explicitly stated.
- The field tables state structural bounds; cross-field constraints and bounded search or output budgets also apply. Unknown keys are rejected where the object contract disallows them. Input errors are distinct from null fields and deliberate invalid controls in a successful output.
Alternative or Complementary methods
For a supplied example, inspect the returned construction or delegated check directly. To evaluate a consumer, also test cases chosen for its own boundaries; a generated finite corpus does not establish exhaustive coverage.
References
Similar or alternative tools
- Random Priority Queue Operation Trace Generator
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- Random Stack Operation Trace Generator
Generate sampled push, pop and peek operations with bottom-to-top LIFO snapshots, explicit empty-stack underflows and a delegated top-first final view.