Make PrimitiveJob serializable

[kt474]

Summary

In qiskit-ibm-runtime we want to add job methods to our QiskitRuntimeLocalService (Issue Qiskit/qiskit-ibm-runtime#1607). In order to save PrimitiveJob objects locally we need a way to serialize them. It's currently not serializable due to the use of ThreadPoolExecutor:

qiskit/qiskit/primitives/primitive_job.py

Lines 47 to 48 in 35d0954

	executor = ThreadPoolExecutor(max_workers=1) # pylint: disable=consider-using-with
	self._future = executor.submit(self._function, *self._args, **self._kwargs)

Credit to @t-imamichi

Details and comments

[qiskit-bot]

One or more of the following people are relevant to this code:

• @Qiskit/terra-core
• @ajavadia
• @levbishop
• @t-imamichi

[kt474]

Is it ok to remove this? This __setattr__ is preventing the serialization of the job result

[t-imamichi]

Could you answer the question, @ihincks?

[t-imamichi]

#12787 asked the same question.

[coveralls]

Pull Request Test Coverage Report for Build 10423431976

Details

• 15 of 21 (71.43%) changed or added relevant lines in 1 file are covered.
• 8 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.02%) to 89.582%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit/primitives/primitive_job.py	15	21	71.43%

Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/expr.rs	1	94.02%
crates/qasm2/src/lex.rs	1	92.73%
crates/qasm2/src/parse.rs	6	97.15%

Totals
Change from base Build 10423065630:	0.02%
Covered Lines:	67600
Relevant Lines:	75462

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💛 - Coveralls