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Extract multiple commit prevention in DNS writers into a base class

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This still retains the DnsWriter interface itself for better integration
with Dagger and to preserve the option of having a DNS writer that does
not have this requirement (e.g. because it is idempotent).

This also makes the commit check thread-safe, which is a nice-to-have.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=168451114
This commit is contained in:
mcilwain 2017-09-12 14:48:54 -07:00 • committed by jianglai
parent f6e0d5fa0c
commit 51298aeabb
4 changed files with 49 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

18
java/google/registry/dns/writer/clouddns/CloudDnsWriter.java
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@ -15,7 +15,6 @@
package google.registry.dns.writer.clouddns;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static google.registry.model.EppResourceUtils.loadByForeignKey;
import com.google.api.client.googleapis.json.GoogleJsonError.ErrorInfo;
@ -33,6 +32,7 @@ import com.google.common.collect.ImmutableSet.Builder;
import com.google.common.net.InternetDomainName;
import com.google.common.util.concurrent.RateLimiter;
import google.registry.config.RegistryConfig.Config;
import google.registry.dns.writer.BaseDnsWriter;
import google.registry.dns.writer.DnsWriter;
import google.registry.dns.writer.DnsWriterZone;
import google.registry.model.domain.DomainResource;
@ -59,7 +59,7 @@ import org.joda.time.Duration;
*
* @see <a href="https://cloud.google.com/dns/docs/">Google Cloud DNS Documentation</a>
*/
public class CloudDnsWriter implements DnsWriter {
public class CloudDnsWriter extends BaseDnsWriter {
/**
* The name of the pricing engine, as used in {@code Registry.dnsWriter}. Remember to change
@ -85,8 +85,6 @@ public class CloudDnsWriter implements DnsWriter {
private final ImmutableMap.Builder<String, ImmutableSet<ResourceRecordSet>>
desiredRecordsBuilder = new ImmutableMap.Builder<>();
private boolean committed = false;
@Inject
CloudDnsWriter(
Dns dnsConnection,
@ -273,15 +271,9 @@ public class CloudDnsWriter implements DnsWriter {
* representation built via this writer.
*/
@Override
public void commit() {
checkState(!committed, "commit() has already been called");
committed = true;
commit(desiredRecordsBuilder.build());
}
@VisibleForTesting
void commit(ImmutableMap<String, ImmutableSet<ResourceRecordSet>> desiredRecords) {
retrier.callWithRetry(getMutateZoneCallback(desiredRecords), ZoneStateException.class);
protected void commitUnchecked() {
retrier.callWithRetry(
getMutateZoneCallback(desiredRecordsBuilder.build()), ZoneStateException.class);
logger.info("Wrote to Cloud DNS");
}