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A constructor of one class cannot change the state of its argument (new PipedInputStream(pos) connects pos)

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还没有人认领这个 Issue。

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5/5
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一周以上
新手友好度
35/100
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java

调研方向

The issue identifies the @StateRefinement limitation and gives a reproducer using PipedInputStream and PipedOutputStream, but names no implementation files or tests. First read how @StateRefinement is represented and processed, then trace the constructor-spec handling and related tests. Done means a parameter-state transition can be specified and the reproducer is accepted without breaking existing behavior.

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描述

enhancement future latte

new PipedInputStream(pos) calls pos.connect(this), so afterwards pos is connected. A spec cannot say this: @StateRefinement describes this (and the return value), not the state of an argument of an external constructor.

PipedOutputStream pos = new PipedOutputStream();
InputStream is = new PipedInputStream(pos);
pos.write(1);   // correct Java

With the Barista PipedOutputStream spec (connected only via new PipedOutputStream(snk) or connect(snk)), main 321a7321 rejects it: found start(pos) but expected connected(pos). Connecting from the input side is the more common idiom; it is how powsybl-core fixed a real 'Pipe not connected' bug, so the developers' fix is rejected.

Proposal: allow a state transition on a parameter in a constructor or method spec, e.g. @StateRefinement(param = "src", to = "connected(src)") on PipedInputStream(PipedOutputStream src).

We would need Latte for this.

主要语言
Java
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36
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2 天 3 小时
30 天内合并 PR
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