Performance233 articles

Table of Contents The Hello WorldWhat the Agent RecordedWhy It Failed BeforeA Larger ExampleWhere This Leaves the IssueDuckDB is an in-process analytical database. You add one JAR to a Java project and get a SQL engine that reads CSV, Parquet, …

Table of Contents The setupThe resultsWhy the differenceWhen to use itSpring Batch jobs usually follow the same pattern: an ItemReader streams rows, an ItemProcessor transforms each one, and an ItemWriter writes them out, chunk by chunk. A chunk-oriented step wires …

Table of Contents SetupQuerying a file on the internet with SQLQuerying a file on the internet with SQLWhere this is actually usefulSumming upDuckDB is described as “SQLite for analytics,” which is true: it’s an in-process database engine that runs inside …

Table of Contents The problem nobody talks about until productionWhat the idempotent Spring Boot starter doesWhat happens when things go wrongIdempotent Spring Boot and Concurrent Requests: the case people forgetThe exactly-once caveat I chose to be loud aboutQuick setup for …

Table of Contents OverviewWhat makes a process a good candidate for durability?Spring PetClinic as an Exploratory DeviceStep 1 — Download the Spring PetClinic sourceStep 2 — Analyze the application for durability candidates2a — Analysis: processes that are good candidates for …

Table of Contents 🔤 Headline: BoxStringBuilder and Dramatically Faster String ConcatenationThe Performance StoryA First-Class BoxStringBuilder TypeOptimization 1: &= Does In-Place AppendOptimization 2: Compiler Self-Assignment RewriteOptimization 3: Compile-Time Literal FoldingOptimization 4: Auto-Switching Runtime Concat StrategyJava Interop Nuance🚀 Headline: Pluggable ClassLoader Factory …

Table of Contents The pre-database era, replayedThe write-ahead log, but for your local variablesTransactions that span monthsThe same pattern, elsewhere in the stackWhat this means for your Java codeOnce upon a time, applications managed their own data files. Every program …

Table of Contents The problem: we all became distributed systems developersDurable execution: crash-proof, not crash-preventingHow it actually works: history replay, not snapshotsThe moving partsSeeing is believingWhy this changes how you write softwareWhen developers first hear about Temporal, they tend to …

Table of Contents The collector doesn’t delete anythingMost objects die youngref = null is dead codeWhen ref = null can helpConclusionOne of the misconceptions that I continuously run into is that nulling out references in Java helps garbage collection. This …