Add Cloud Tasks Readmes (#1156)

* Add Cloud Tasks Readme

* update endpoint and env var

* remove app viewing command

appengine-java8/tasks/README.md

@@ -0,0 +1,101 @@
+# Google Cloud Tasks App Engine Queue Samples
+
+Sample command-line program for interacting with the Cloud Tasks API
+using App Engine queues.
+
+App Engine queues push tasks to an App Engine HTTP target. This directory
+contains both the App Engine app to deploy, as well as the snippets to run
+locally to push tasks to it, which could also be called on App Engine.
+
+`CreateTask.java` is a simple command-line program to create
+tasks to be pushed to the App Engine app.
+
+`TaskServlet.java` is the main App Engine app. This app serves as an endpoint to receive
+App Engine task attempts.
+
+
+## Initial Setup
+
+ * Set up a Google Cloud Project and enable billing.
+ * Enable the
+ [Cloud Tasks API](https://console.cloud.google.com/launcher/details/google/cloudtasks.googleapis.com).
+ * Download and install the [Cloud SDK](https://cloud.google.com/sdk).
+ * Download and install [Maven](http://maven.apache.org/install.html).
+
+## Creating a queue
+
+To create a queue using the Cloud SDK, use the following gcloud command:
+
+```
+gcloud beta tasks queues create-app-engine-queue my-appengine-queue
+```
+
+Note: A newly created queue will route to the default App Engine service and
+version unless configured to do otherwise.
+
+## Deploying the App Engine app
+[Using Maven and the App Engine Plugin](https://cloud.google.com/appengine/docs/flexible/java/using-maven)
+& [Maven Plugin Goals and Parameters](https://cloud.google.com/appengine/docs/flexible/java/maven-reference)
+
+### Running locally
+
+```
+mvn appengine:run
+```
+### Deploying
+
+```
+mvn appengine:deploy
+```
+
+## Running the Sample
+
+Set environment variables:
+
+First, your project ID:
+
+```
+export GOOGLE_CLOUD_PROJECT=<YOUR_PROJECT_ID>
+```
+
+Then the queue ID, as specified at queue creation time. Queue IDs already
+created can be listed with `gcloud beta tasks queues list`.
+
+```
+export QUEUE_ID=my-appengine-queue
+```
+
+And finally the location ID, which can be discovered with
+`gcloud beta tasks queues describe $QUEUE_ID`, with the location embedded in
+the "name" value (for instance, if the name is
+"projects/my-project/locations/us-central1/queues/my-appengine-queue", then the
+location is "us-central1").
+
+```
+export LOCATION_ID=<YOUR_ZONE>
+```
+
+Create a task, targeted at the `/tasks/create` endpoint, with a payload specified:
+
+```
+mvn exec:java -Dexec.mainClass="com.example.task.CreateTask" \
+    -Dexec.args="--project-id $GOOGLE_CLOUD_PROJECT \
+    --queue $QUEUE_ID --location $LOCATION_ID --payload hello"
+```
+
+The App Engine app serves as a target for the push requests. It has an
+endpoint `/tasks/create` that reads the payload (i.e., the request body) of the
+HTTP POST request and logs it. The log output can be viewed with:
+
+```
+gcloud app logs read
+```
+
+Create a task that will be scheduled for a time in the future using the
+`--in-seconds` flag:
+
+```
+mvn exec:java -Dexec.mainClass="com.example.task.CreateTask" \
+    -Dexec.args="--project-id $GOOGLE_CLOUD_PROJECT \
+    --queue $QUEUE_ID --location $LOCATION_ID --payload hello --in-seconds 30"
+```

tasks/README.md

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+# Google Cloud Tasks Pull Queue Samples
+
+<a href="https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/GoogleCloudPlatform/java-docs-samples&page=editor&open_in_editor=tasks/README.md">
+<img alt="Open in Cloud Shell" src ="http://gstatic.com/cloudssh/images/open-btn.png"></a>
+
+Sample command-line program for interacting with the Google Cloud Tasks
+API using pull queues.
+
+Pull queues let you add tasks to a queue, then programatically remove
+and interact with them. Tasks can be added or processed in any
+environment, such as on Google App Engine or Google Compute Engine.
+
+`Quickstart.java` is a simple command-line program to demonstrate listing
+queues, creating tasks, and pulling and acknowledging tasks.
+
+## Initial Setup
+
+ * Set up a Google Cloud Project and enable billing.
+ * Enable the
+ [Cloud Tasks API](https://console.cloud.google.com/launcher/details/google/cloudtasks.googleapis.com).
+ * Download and install the [Cloud SDK](https://cloud.google.com/sdk).
+ * Download and install [Maven](http://maven.apache.org/install.html).
+
+
+## Creating a queue
+
+To create a queue using the Cloud SDK, use the following gcloud command:
+
+```
+gcloud beta tasks queues create-pull-queue my-pull-queue
+```
+
+In this example, the queue will be named `my-pull-queue`.
+
+## Running the Samples
+
+From the project folder, build your project with:
+
+```
+mvn clean install
+```
+
+Optionally, you can set up your settings as environment variables:
+
+```
+export GOOGLE_CLOUD_PROJECT=<YOUR_PROJECT_ID>
+export LOCATION_ID=<YOUR_ZONE>
+export QUEUE_ID=my-pull-queue
+```
+
+Next, create a task for a queue:
+
+```
+mvn exec:java -Dexec.mainClass="com.example.Quickstart" \
+    -Dexec.args="create-task \
+    --project $GOOGLE_CLOUD_PROJECT --queue $QUEUE_ID --location $LOCATION_ID"
+```
+
+Finally, pull and acknowledge a task:
+
+```
+mvn exec:java -Dexec.mainClass="com.example.task.Quickstart" \
+    -Dexec.args="lease-and-ack-task \
+    --project $GOOGLE_CLOUD_PROJECT --queue $QUEUE_ID --location $LOCATION_ID"
+```
+Note that usually, there would be a processing step in between pulling a task and acknowledging it.