Class: DispatchPolicy::PartitionsController

Inherits:
ApplicationController show all
Defined in:
app/controllers/dispatch_policy/partitions_controller.rb

Constant Summary collapse

DRAIN_MAX_PER_REQUEST = 
10_000
DRAIN_BATCH_SIZE = 
200
PAGE_SIZE = 
100

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.drain_partition!(partition) ⇒ Object 



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# File 'app/controllers/dispatch_policy/partitions_controller.rb', line 96

def self.drain_partition!(partition)
  drained = 0
  while drained < DRAIN_MAX_PER_REQUEST
    batch_limit = [DRAIN_BATCH_SIZE, DRAIN_MAX_PER_REQUEST - drained].min
    rows = Repository.claim_staged_jobs!(
      policy_name:      partition.policy_name,
      partition_key:    partition.partition_key,
      limit:            batch_limit,
      gate_state_patch: {},
      retry_after:      nil
    )
    break if rows.empty?

    Forwarder.dispatch(rows)
    drained += rows.size
  end
  remaining = partition.class.where(id: partition.id).pick(:pending_count) || 0
  [drained, remaining]
end

Instance Method Details

#admit ⇒ Object 



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# File 'app/controllers/dispatch_policy/partitions_controller.rb', line 69

def admit
  count = Integer(params[:count] || 1)
  rows = Repository.claim_staged_jobs!(
    policy_name:      @partition.policy_name,
    partition_key:    @partition.partition_key,
    limit:            count,
    gate_state_patch: {},
    retry_after:      nil
  )
  forwarded = rows.size - Forwarder.dispatch(rows).size
  redirect_to partition_path(@partition), notice: "Forwarded #{forwarded} job(s)."
end

#drain ⇒ Object

Empties the partition by force-admitting every staged job through the forwarder, bypassing all gates. Bounded at DRAIN_MAX_PER_REQUEST so a huge backlog can’t time the controller out — the operator clicks again for the next batch.



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# File 'app/controllers/dispatch_policy/partitions_controller.rb', line 86

def drain
  drained, remaining = self.class.drain_partition!(@partition)
  notice = if remaining.positive?
    "Drained #{drained} job(s); #{remaining} still pending — click drain again to continue."
  else
    "Drained #{drained} job(s); partition empty."
  end
  redirect_to partition_path(@partition), notice: notice
end

#index ⇒ Object 



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# File 'app/controllers/dispatch_policy/partitions_controller.rb', line 12

def index
  base = Partition.all
  base = base.for_policy(params[:policy]) if params[:policy].present?
  base = base.for_shard(params[:shard])   if params[:shard].present?
  base = base.where("partition_key ILIKE ?", "%#{params[:q]}%") if params[:q].present?
  base = base.where("pending_count > 0")                         if params[:only_pending] == "1"

  @sort = DispatchPolicy::CursorPagination::SORTS.key?(params[:sort]) ? params[:sort] : DispatchPolicy::CursorPagination::DEFAULT_SORT
  sort_def = DispatchPolicy::CursorPagination.sort_for(@sort)

  @total  = base.count   # cheap on indexed columns; nice to display
  @cursor = DispatchPolicy::CursorPagination.decode(params[:cursor])

  paginated = DispatchPolicy::CursorPagination.apply(base, @sort, @cursor)
                                               .order(Arel.sql(sort_def[:sql_order]))
                                               .limit(PAGE_SIZE + 1)
                                               .to_a

  @has_more   = paginated.size > PAGE_SIZE
  @partitions = paginated.first(PAGE_SIZE)
  @next_cursor =
    if @has_more && @partitions.any?
      v, id = DispatchPolicy::CursorPagination.extract(@partitions.last, @sort)
      DispatchPolicy::CursorPagination.encode(v, id)
    end

  @policy        = params[:policy]
  @shard         = params[:shard]
  @query         = params[:q]
  @only_pending  = params[:only_pending] == "1"

  shards_scope = Partition.all
  shards_scope = shards_scope.for_policy(params[:policy]) if params[:policy].present?
  @shards      = shards_scope.distinct.pluck(:shard).sort
end

#pagination_params(overrides = {}) ⇒ Object

Build URL params preserving filters, replacing the cursor.



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# File 'app/controllers/dispatch_policy/partitions_controller.rb', line 49

def pagination_params(overrides = {})
  {
    policy:        @policy.presence,
    shard:         @shard.presence,
    q:             @query.presence,
    sort:          (@sort if @sort != DispatchPolicy::CursorPagination::DEFAULT_SORT),
    only_pending:  ("1" if @only_pending),
    cursor:        nil
  }.compact.merge(overrides)
end

#show ⇒ Object 



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# File 'app/controllers/dispatch_policy/partitions_controller.rb', line 61

def show
  @recent_jobs = StagedJob
    .for_partition(@partition.policy_name, @partition.partition_key)
    .order(:scheduled_at, :id)
    .limit(50)
  @inflight = InflightJob.where(policy_name: @partition.policy_name).limit(50)
end