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Signed-off-by: Shlomi Livne <shlomi@cloudius-systems.com>
Add a when_all() variant that waits for a runtime variable number of
futures, all of the same type. The function returns a future containing
a vector of all input futures, each in ready state, containing either
a result or an exception.
Currently we have one version of when_all(), that accepts a compile
type variable number of independently typed futures. We wish to add more
overloads, but for that, we must ensure that this variant doesn't match them.
Accomplish this by requiring that the first argument be a future, and don't
accept any other type.
allocate_buffer was added to data_sink as a virtual method, so that
a class extending it can override its implementation.
output_stream will also start using allocate_buffer whenever it
needs a temporary buffer.
We usually don't read the whole file into memory, so the probing interface will
also allow for the specification of boundaries that we should be use for
reading.
The sstable needs to be informed - usually by the schema - of how many columns
the partition key is composed of - 1 for simple keys, more than one, for
composites.
Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
Because we're expected to go to those files many times, it doesn't make sense
to keep opening them. Upon sstable load, we will open those files and then move
the reference to the sstable main structure. From this point on, we can just seek
to the position we want.
Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
So it represents all kinds of mismatches. Not only buf < expected.
It will be useful in the index parsing code.
Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
Right now we will always move the file to create a shared pointer from it.
However, there are situations in which we don't really want to move it, because
it will be still used elsewhere.
One example is the index and data readers, where we will store a file object to
avoid opening the file all the time. In such situation, we can pass a shared
pointer that is already constructed to the file_input_stream.
The alternative to that would have been to store the file_input_stream itself.
That would, however, require us to export that in some header. It's best to
keep it private. Since we will already deal with a shared pointer anyway, it is
best to provide this option.
Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
In fstream.cc, use the convenient new temporary_buffer<char>::aligned()
function for creating an aligned temporary buffer - instead of repeating
its implementation.
Signed-off-by: Nadav Har'El <nyh@cloudius-systems.com>
