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Re: Proposal
- From: Werner Keil <
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- To: "
" <
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- Subject: Re: Proposal
- Date: Sun, 2 Nov 2014 13:26:10 +0100
We may want to scrap this particular example, since a competing with at
least 3(!) "high level" Time Unit APIs in Java SE 8+ alone
java.util.concurrent.TimeUnit exists.
It is not used by Thread as such, so one could use pretty much all of the
above plus JSR 363[?]
Werner
On Sun, Nov 2, 2014 at 1:15 PM, Jean-Marie Dautelle
<
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wrote:
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Errata:
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public void wait(Time delay) {
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long microseconds = delay.to(MICRO(SECOND)).value().longValue();
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Thread.wait(microseconds);
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}
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On Sun, Nov 2, 2014 at 1:11 PM, Jean-Marie Dautelle
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<
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wrote:
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> > I also assume, you don't want to eliminate the to(Quantity) method from
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> Quantity, do you?
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> Not necessarily. A quantity may be stated in any compatible unit.
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>
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> public void wait(Time delay) {
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> long microseconds = delay.to(MICRO(SECOND)).longValue();
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> Thread.wait(microseconds);
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> }
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> > WDYT?
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>
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> Fully agree, the API should have only interfaces!
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> On Sun, Nov 2, 2014 at 12:50 PM, Werner Keil
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> <
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> wrote:
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>> I also assume, you don't want to eliminate the to(Quantity) method from
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>> Quantity, do you?
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>>
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>> Fowler proposes exactly that signature, though he also leaves it open to
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>> create a separate Converter element, see JSR 354 simply because you need
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>> to
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>> know a lot more for currency conversion like time, date, type (cash,
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>> card,
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>> bond, ...) of monetary amount, etc.
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>> So far we had a fairly simple conversion here, nevertheless typesafe
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>> thanks to generics.
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>>
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>> If only Quantity existed, then like in other cases MeasurementConverter
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>> (defining the to()) and ValueSupplier would only serve one interface,
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>> hence
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>> could logically be merged into Quantity.
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>>
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>> If a common understanding is (unlike OpenXC where non-numeric quantities
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>> are indeed also treated typesafe via a "Unit", but it got no operations on
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>> the other hand) a multitude or non-numeric quantity would not even have a
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>> unit, then the current Measurement becomes redundant, as the only purpose
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>> would be to make these multitudes type-safe, too.
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>>
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>> In the interest of an ultra-slim approach for smallest devices (that
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>> need just a single Unit and Quantity, either from our pre-defined SI stack
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>> or something completely different)
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>> could we move the now "orphaned" QuantityFactory and SystemOfUnits into
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>> SPI (as they have no external dependencies to them in mandatory
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>> base-types)
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>> and push UnitConverter up into the root package instead?
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>>
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>> This makes us or users more flexible regarding optionality all optional
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>> packages depend only on the base elements, not even on each other[?]
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>> And only the root package "javax.measure" contains mandatory core
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>> elements.
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>>
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>> WDYT?
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>>
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>> On Sun, Nov 2, 2014 at 12:40 PM, Jean-Marie Dautelle
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>> <
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>> > wrote:
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>>
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>>> > Do I'm understanding right?
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>>>
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>>> Yes 100 %
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>>>
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>>> On Sun, Nov 2, 2014 at 12:24 PM, Martin Desruisseaux <
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>>>
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>>> wrote:
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>>>
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>>>> Hello Jean-Marie
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>>>>
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>>>> To summarize, you are suggesting three things:
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>>>>
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>>>>
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>>>> 1. Remove the Measurement interface in order to avoid the
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>>>> conceptual problem with hierarchy.
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>>>> 2. Define the Quantity interface as a quantitative measurement
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>>>> (since it contains a value and a unit).
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>>>> 3. Overload the multiply and divide methods for type safety.
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>>>>
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>>>>
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>>>> Do I'm understanding right?
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>>>>
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>>>> Martin
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>>>>
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>>>>
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>>>
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>>>
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>>> --
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>>> It is not the strongest of the species that survives, nor the most
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>>> intelligent. It is the one that is most adaptable to change. - Darwin's
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>>> Origin of Species (digest)
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>>>
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>>
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>>
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>
>
>
>
> --
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> It is not the strongest of the species that survives, nor the most
>
> intelligent. It is the one that is most adaptable to change. - Darwin's
>
> Origin of Species (digest)
>
>
>
>
>
>
--
>
It is not the strongest of the species that survives, nor the most
>
intelligent. It is the one that is most adaptable to change. - Darwin's
>
Origin of Species (digest)
>
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