Import code from internal repository to git

java/com/google/domain/registry/dns/writer/api/DnsWriter.java

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+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.domain.registry.dns.writer.api;
+
+/**
+ * Transaction object for sending an atomic batch of updates for a single zone to the DNS server.
+ *
+ * <p>Here's an example of how you would publish updates for a domain and host:
+ * <pre>
+ * &#064;Inject Provider&lt;DnsWriter&gt; dnsWriter;
+ * try (DnsWriter writer = dnsWriter.get()) {
+ *   writer.publishDomain(domainName);
+ *   writer.publishHost(hostName);
+ * }
+ * </pre>
+ */
+public interface DnsWriter extends AutoCloseable {
+
+  /**
+   * Loads {@code domainName} from datastore and publishes its NS/DS records to the DNS server.
+   *
+   * @param domainName the fully qualified domain name
+   */
+  void publishDomain(String domainName);
+
+  /**
+   * Loads {@code hostName} from datastore and publishes its A/AAAA glue records to the DNS server.
+   *
+   * @param hostName the fully qualified host name
+   */
+  void publishHost(String hostName);
+
+  /** Commits the updates to the DNS server atomically. */
+  @Override
+  void close();
+}