Ankur Mhatre
958b401f0f
Adds spring-boot-startup-time/, the companion project for BLOG-618: a runnable Spring Boot 4.1.1 application on JDK 25 that installs BufferingApplicationStartup and FlightRecorderApplicationStartup behind a system property, and a /diag/startup endpoint that computes step self time -- the number /actuator/startup does not give you and the one that names the actual culprits. Captured under docs/output/: the step tree sorted both ways, the same startup as JFR events, a +5000-class experiment putting 0.11 ms per scanned class on the classpath scan tax, the silent truncation a 2048-step buffer performs, and JDK 25 AOT cache timings (6.93 s to 4.82 s). Post body and metadata live in post/. Moves the existing Actuator project into actuator-in-production/ so the repository holds one directory per article; the root README is now an index.
23 lines
1.0 KiB
Bash
Executable File
23 lines
1.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# gen-bulk.sh <count> <plain|component>
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# Writes <count> classes into the package that @SpringBootApplication already scans.
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#
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# 'plain' classes carry no stereotype annotation at all. They are still opened, read and
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# have their annotation metadata parsed by the scanner -- which is the point: it separates
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# the cost of *scanning* from the cost of *creating beans*.
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set -euo pipefail
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COUNT="${1:-5000}"
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KIND="${2:-plain}"
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ROOT="$(cd "$(dirname "$0")/.." && pwd)"
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DIR="$ROOT/src/main/java/com/ankurm/startup/bulk"
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rm -rf "$DIR"; mkdir -p "$DIR"
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for i in $(seq 1 "$COUNT"); do
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if [ "$KIND" = "component" ]; then
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printf 'package com.ankurm.startup.bulk;\nimport org.springframework.stereotype.Component;\n@Component\npublic class Bulk%d { public int id() { return %d; } }\n' "$i" "$i" > "$DIR/Bulk$i.java"
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else
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printf 'package com.ankurm.startup.bulk;\npublic class Bulk%d { public int id() { return %d; } }\n' "$i" "$i" > "$DIR/Bulk$i.java"
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fi
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done
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echo "generated $COUNT $KIND classes in src/main/java/com/ankurm/startup/bulk"
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