mv com/google/domain/registry google/registry

This change renames directories in preparation for the great package
rename. The repository is now in a broken state because the code
itself hasn't been updated. However this should ensure that git
correctly preserves history for each file.

java/google/registry/dns/DnsQueue.java

@@ -0,0 +1,161 @@
+// Copyright 2016 The Domain Registry Authors. 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;
+
+import static com.google.common.base.Preconditions.checkArgument;
+import static com.google.common.base.Strings.isNullOrEmpty;
+import static com.google.domain.registry.dns.DnsConstants.DNS_PULL_QUEUE_NAME;
+import static com.google.domain.registry.dns.DnsConstants.DNS_TARGET_NAME_PARAM;
+import static com.google.domain.registry.dns.DnsConstants.DNS_TARGET_TYPE_PARAM;
+import static com.google.domain.registry.model.registry.Registries.assertTldExists;
+import static com.google.domain.registry.request.RequestParameters.PARAM_TLD;
+import static com.google.domain.registry.util.DomainNameUtils.getTldFromDomainName;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
+import com.google.appengine.api.taskqueue.Queue;
+import com.google.appengine.api.taskqueue.QueueConstants;
+import com.google.appengine.api.taskqueue.QueueFactory;
+import com.google.appengine.api.taskqueue.TaskHandle;
+import com.google.appengine.api.taskqueue.TaskOptions;
+import com.google.appengine.api.taskqueue.TaskOptions.Method;
+import com.google.appengine.api.taskqueue.TransientFailureException;
+import com.google.apphosting.api.DeadlineExceededException;
+import com.google.common.base.Optional;
+import com.google.common.collect.ImmutableList;
+import com.google.common.net.InternetDomainName;
+import com.google.domain.registry.config.ConfigModule.Config;
+import com.google.domain.registry.dns.DnsConstants.TargetType;
+import com.google.domain.registry.model.registry.Registries;
+import com.google.domain.registry.util.FormattingLogger;
+
+import org.joda.time.Duration;
+
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+import javax.annotation.Nullable;
+import javax.inject.Inject;
+import javax.inject.Named;
+
+/** Methods for manipulating the queue used for DNS write tasks. */
+public class DnsQueue {
+
+  private static final FormattingLogger logger = FormattingLogger.getLoggerForCallerClass();
+
+  @Inject @Config("dnsWriteLockTimeout") Duration writeLockTimeout;
+  @Inject @Named(DNS_PULL_QUEUE_NAME) Queue queue;
+  @Inject DnsQueue() {}
+  
+  long writeBatchSize = QueueConstants.maxLeaseCount();
+
+  /**
+   * Enqueues the given task type with the given target name to the DNS queue, tagged with the
+   * specified TLD.
+   */
+  private TaskHandle addToQueue(TargetType targetType, String targetName, String tld) {
+    return queue.add(TaskOptions.Builder
+        // TODO(b/24564175): don't set the tag
+        .withTag(tld)
+        .method(Method.PULL)
+        .param(DNS_TARGET_TYPE_PARAM, targetType.toString())
+        .param(DNS_TARGET_NAME_PARAM, targetName)
+        .param(PARAM_TLD, tld));
+  }
+
+  /**
+   * Adds a task to the queue to refresh the DNS information for the specified subordinate host.
+   */
+  public TaskHandle addHostRefreshTask(String fullyQualifiedHostName) {
+    Optional<InternetDomainName> tld =
+        Registries.findTldForName(InternetDomainName.from(fullyQualifiedHostName));
+    checkArgument(tld.isPresent(),
+        String.format("%s is not a subordinate host to a known tld", fullyQualifiedHostName));
+    return addToQueue(TargetType.HOST, fullyQualifiedHostName, tld.get().toString());
+  }
+
+  /** Adds a task to the queue to refresh the DNS information for the specified domain. */
+  public TaskHandle addDomainRefreshTask(String fullyQualifiedDomainName) {
+    return addToQueue(
+        TargetType.DOMAIN,
+        fullyQualifiedDomainName,
+        assertTldExists(getTldFromDomainName(fullyQualifiedDomainName)));
+  }
+
+  /** Adds a task to the queue to refresh the DNS information for the specified zone. */
+  public TaskHandle addZoneRefreshTask(String fullyQualifiedZoneName) {
+    return addToQueue(TargetType.ZONE, fullyQualifiedZoneName, fullyQualifiedZoneName);
+  }
+
+  /**
+   * Returns a batch of pending tasks.
+   */
+  public List<TaskHandle> leaseTasks() {
+    return leaseTasks(null);
+  }
+
+  /**
+   * Returns a batch of pending tasks.
+   *
+   * @param tag the filter used to lease only those tasks that match
+   */
+  public List<TaskHandle> leaseTasks(@Nullable String tag) {
+    try {
+      return isNullOrEmpty(tag)
+          ? queue.leaseTasks(writeLockTimeout.getMillis(), MILLISECONDS, writeBatchSize)
+          : queue.leaseTasksByTag(writeLockTimeout.getMillis(), MILLISECONDS, writeBatchSize, tag);
+    } catch (TransientFailureException | DeadlineExceededException e) {
+      logger.severe(e, "Failed leasing tasks too fast");
+      return ImmutableList.of();
+    }
+  }
+
+  /** Reduce the task lease time to zero, making it immediately available to be leased again. */
+  public void dropTaskLease(TaskHandle task) {
+    try {
+      queue.modifyTaskLease(task, 0, TimeUnit.SECONDS);
+    } catch (IllegalStateException e) {
+      logger.warningfmt(e, "Failed dropping expired lease: %s", task.getName());
+    } catch (TransientFailureException | DeadlineExceededException e) {
+      logger.severe(e, "Failed dropping task leases too fast");
+    }
+  }
+
+  /** Delete the task, removing it from the queue permanently. */
+  public void deleteTask(TaskHandle task) {
+    try {
+      queue.deleteTask(task);
+    } catch (TransientFailureException | DeadlineExceededException e) {
+      logger.severe(e, "Failed deleting tasks too fast");
+    }
+  }
+
+  /** Delete a list of tasks, removing them from the queue permanently. */
+  public void deleteTasks(List<TaskHandle> tasks) {
+    try {
+      queue.deleteTask(tasks);
+    } catch (TransientFailureException | DeadlineExceededException e) {
+      logger.severe(e, "Failed deleting tasks too fast");
+    }
+  }
+
+  // TODO(b/19483428): Remove me when flows package is ported to Dagger.
+  /** Creates a new instance. */
+  public static DnsQueue create() {
+    DnsQueue result = new DnsQueue();
+    result.writeLockTimeout = Duration.standardSeconds(120);
+    result.queue = QueueFactory.getQueue(DNS_PULL_QUEUE_NAME);
+    return result;
+  }
+}