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@BooleanFlag
@Name("example.Rollback")
@Label("Rollback")
@Description("Include transactions that are rollbacked")
public static class RollbackSetting extends SettingControl {
    private boolean value = true;

    @Override
    public String combine(Set<String> values) {
        return values.contains("true") ? "true" : "false";
    }

    @Override
    public void setValue(String settingValue) {
        value = "true".equals(settingValue);
    }

    @Override
    public String getValue() {
        return Boolean.toString(value);
    }

    public boolean shouldEmit() {
        return value;
    }
}

@Name("example.Transaction")
public static class TransactionEvent extends Event {
    @Label("Context")
    String context;

    @Label("Rollback")
    boolean rollback;

    @SettingDefinition
    @Name("rollback")
    public boolean rollback(RollbackSetting rollbackSetting) {
        return rollback && rollbackSetting.shouldEmit();
    }
}