The fix was a persistent JVM daemon I wrote called CompileServer. It’s a Java program that boots once, loads the compiler API via javax.tools.JavaCompiler, and then sits there waiting for work over stdin. When you send it source code, it compiles in-process using the already-loaded compiler. When you want to run the compiled class, it uses a URLClassLoader to load and execute it. Same JVM. No restarts. No twelve minute tax.
This heuristic can be illustrated by the following design. Let’s say we have an application that generates a report, compresses it with zip, and saves it to the disk. With this heuristic in mind, we wouldn’t want the report generation to depend on the zip algorithm. A change from zip to LZMA algorithm shouldn’t affect the report generation. Likewise, the compression module shouldn’t depend on the file storage module. If we follow that heuristic, we will be able to change file storage to network storage without affecting compression or the report module. (By the way, this design might not be ideal, for instance, these tasks are too small to be modules, but I hope it conveys the meaning of this heuristic).
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伊朗戰爭第三天，我們仍完全不知道它將走向何方