Dai Ha
86 lines
3.3 KiB
Java
86 lines
3.3 KiB
Java
package dev.ltms.bridged.placement;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Shared filtering and empty-set reporting used by the built-in placement policies.
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*/
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final class PlacementPolicyUtil {
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private PlacementPolicyUtil() {
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}
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/**
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* Candidates that are not weight-excluded (CB-554: explicit {@code weight <= 0}, checked
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* first because it is a static config choice rather than transient state), not
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* known-unreachable, not quarantined (CB-578 stage B), and have not reached their maxLoad.
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* A {@code null} maxLoad means unlimited.
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*/
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static List<PlacementCandidate> available(PlacementContext ctx) {
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List<PlacementCandidate> out = new ArrayList<>();
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for (PlacementCandidate c : ctx.candidates()) {
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if (c.excluded() || ctx.unreachable().contains(c.profile())
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|| ctx.quarantined().contains(c.profile())) {
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continue;
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}
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Integer cap = c.maxLoad();
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if (cap != null) {
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int live = ctx.liveCount().apply(c.profile());
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if (live >= cap) {
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continue;
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}
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}
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out.add(c);
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}
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return out;
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}
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/**
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* Build a clear exception describing why every candidate was dropped: all weight-0, all
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* quarantined, all at capacity, all unreachable, or a mix. Each candidate is counted into
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* exactly one bucket (weight-excluded takes priority) so a candidate excluded for more than
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* one reason is never double-counted.
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*/
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static PlacementException emptyException(PlacementContext ctx) {
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int weightExcluded = 0;
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int atCap = 0;
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int unreachable = 0;
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int quarantined = 0;
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for (PlacementCandidate c : ctx.candidates()) {
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Integer cap = c.maxLoad();
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if (c.excluded()) {
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weightExcluded++;
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} else if (ctx.quarantined().contains(c.profile())) {
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quarantined++;
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} else if (ctx.unreachable().contains(c.profile())) {
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unreachable++;
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} else if (cap != null && ctx.liveCount().apply(c.profile()) >= cap) {
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atCap++;
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}
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}
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int total = ctx.candidates().size();
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if (total == 0) {
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return new PlacementException("no worker profiles configured");
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}
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if (weightExcluded == total) {
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return new PlacementException(
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"all worker profiles have weight 0 (excluded from automatic selection)");
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}
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if (quarantined == total) {
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return new PlacementException("all worker profiles are quarantined (backend exhausted)");
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}
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if (atCap == total) {
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return new PlacementException("all worker profiles are at maxLoad");
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}
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if (unreachable == total) {
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return new PlacementException("all worker profiles are unreachable");
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}
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return new PlacementException("no worker profile available: " + atCap + " at maxLoad, "
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+ unreachable + " unreachable, " + quarantined + " quarantined, "
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+ weightExcluded + " weight-0, "
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+ (total - atCap - unreachable - quarantined - weightExcluded) + " remaining");
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}
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}
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