enhance "JustOnceRule" about ta4j HOT 5 CLOSED

Rule myJustOnceRule = new CrossedUpIndicatorRule(indicator1, indicator2).and(new JustOnceRule())

If I understand the OP requirement's correctly this only works on the first invocation. Let's say the first time around the CrossedUpIndicatorRule part returns false, and the JustOnceRule returns true. We get an overall false and everything is working as expected.

The second time around, the CrossedUpIndicatorRule returns true, but the JustOnceRule returns false (since it's already fired in the past). In this case, we want the overall expression to return true since this is the first time the subject rule (CrossedUpIndicatorRule) is satisfied. Unfortunately this time (and all subsequent times) we get an overall false.

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"CrossedUp/CrossedDownRule" (which only fires one time as soon as the rule is satisfied and then never again).

That is not correct. CrossedUP/CrossedDownRule fires every time when the value of indicator1 crosses up/down the value of indicator2

If i have understand you correct you can reach your plan without enhance the rule, but by adding the JustRunceRule via .and() conjunction to the rule you want to be satisfied just the first time, like:

Rule myJustOnceRule = new CrossedUpIndicatorRule(indicator1, indicator2).and(new JustOnceRule())

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Ah, i see -.- .
So @nimo23 approach is correct

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Thanks.

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I accidentially pushed to develop branch, but you can find the new rule from @TheCookieLab there.

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