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Asnychronous PreReceiveRepositoryHooks do not work with subversion

\n

The following example will fail to log the changesets.

\n
import com.github.legman.Subscribe;\nimport org.slf4j.Logger;\nimport org.slf4j.LoggerFactory;\nimport sonia.scm.plugin.Extension;\nimport sonia.scm.repository.Changeset;\nimport sonia.scm.repository.PreReceiveRepositoryHookEvent;\nimport sonia.scm.repository.api.HookChangesetBuilder;\n\n@Extension\n@EagerSingleton\npublic class DemoHook {\n\n  private static final Logger LOG = LoggerFactory.getLogger(DemoHook.class);\n\n  @Subscribe\n  public void handleEvent(PreReceiveRepositoryHookEvent event) {\n    HookChangesetBuilder changesetProvider = event.getContext().getChangesetProvider();\n    for (Changeset c : changesetProvider.getChangesets()) {\n      LOG.warn(\"received {} hook for changeset: {}\", event.getType(), c.getId());\n    }\n  }\n\n}
\n

This is because of the transaction management of subversion. The scm-manager subversion provider becomes a transaction id for the changes of the current push, but the transaction has finished before scm-manager can resolve the incoming commit. To solve the issue, we could use a synchronous subscription instead e.g.:

\n
import com.github.legman.Subscribe;\nimport org.slf4j.Logger;\nimport org.slf4j.LoggerFactory;\nimport sonia.scm.plugin.Extension;\nimport sonia.scm.repository.Changeset;\nimport sonia.scm.repository.PreReceiveRepositoryHookEvent;\nimport sonia.scm.repository.api.HookChangesetBuilder;\n\n@Extension\n@EagerSingleton\npublic class DemoHook {\n\n  private static final Logger LOG = LoggerFactory.getLogger(DemoHook.class);\n\n  @Subscribe(async = false)\n  public void handleEvent(PreReceiveRepositoryHookEvent event) {\n    HookChangesetBuilder changesetProvider = event.getContext().getChangesetProvider();\n    for (Changeset c : changesetProvider.getChangesets()) {\n      LOG.warn(\"received {} hook for changeset: {}\", event.getType(), c.getId());\n    }\n  }\n\n}
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