/**
* The only dep for this rule should be {@link #javaLibrary}. Therefore, the ABI key for the deps
* of this buildable is the hash of the {@code .class} files for {@link #javaLibrary}.
*/
@Override
public Sha1HashCode getAbiKeyForDeps(DefaultRuleKeyBuilderFactory defaultRuleKeyBuilderFactory) {
return computeAbiKey(javaLibrary.getClassNamesToHashes());
}
@Override
public ImmutableList<Step> getBuildSteps(
BuildContext context, final BuildableContext buildableContext) {
ImmutableList.Builder<Step> steps = ImmutableList.builder();
steps.add(new RmStep(getProjectFilesystem(), getPathToDex(), /* shouldForceDeletion */ true));
// Make sure that the buck-out/gen/ directory exists for this.buildTarget.
steps.add(new MkdirStep(getProjectFilesystem(), getPathToDex().getParent()));
// If there are classes, run dx.
final ImmutableSortedMap<String, HashCode> classNamesToHashes =
javaLibrary.getClassNamesToHashes();
final boolean hasClassesToDx = !classNamesToHashes.isEmpty();
final Supplier<Integer> linearAllocEstimate;
if (hasClassesToDx) {
Path pathToOutputFile = javaLibrary.getPathToOutput();
EstimateLinearAllocStep estimate =
new EstimateLinearAllocStep(getProjectFilesystem(), pathToOutputFile);
steps.add(estimate);
linearAllocEstimate = estimate;
// To be conservative, use --force-jumbo for these intermediate .dex files so that they can be
// merged into a final classes.dex that uses jumbo instructions.
DxStep dx =
new DxStep(
getProjectFilesystem(),
getPathToDex(),
Collections.singleton(pathToOutputFile),
EnumSet.of(
DxStep.Option.USE_CUSTOM_DX_IF_AVAILABLE,
DxStep.Option.RUN_IN_PROCESS,
DxStep.Option.NO_OPTIMIZE,
DxStep.Option.FORCE_JUMBO));
steps.add(dx);
// The `DxStep` delegates to android tools to build a ZIP with timestamps in it, making
// the output non-deterministic. So use an additional scrubbing step to zero these out.
steps.add(new ZipScrubberStep(getProjectFilesystem(), getPathToDex()));
} else {
linearAllocEstimate = Suppliers.ofInstance(0);
}
// Run a step to record artifacts and metadata. The values recorded depend upon whether dx was
// run.
String stepName = hasClassesToDx ? "record_dx_success" : "record_empty_dx";
AbstractExecutionStep recordArtifactAndMetadataStep =
new AbstractExecutionStep(stepName) {
@Override
public StepExecutionResult execute(ExecutionContext context) throws IOException {
if (hasClassesToDx) {
buildableContext.recordArtifact(getPathToDex());
}
buildableContext.addMetadata(
LINEAR_ALLOC_KEY_ON_DISK_METADATA, String.valueOf(linearAllocEstimate.get()));
// Record the classnames to hashes map.
buildableContext.addMetadata(
CLASSNAMES_TO_HASHES,
context
.getObjectMapper()
.writeValueAsString(
Maps.transformValues(classNamesToHashes, Functions.toStringFunction())));
return StepExecutionResult.SUCCESS;
}
};
steps.add(recordArtifactAndMetadataStep);
return steps.build();
}