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Posted to dev@jclouds.apache.org by Adi <no...@github.com> on 2013/05/31 15:30:38 UTC
[jclouds-examples] BlobStore file system api usage in scala (#4)
I could not find right example for BlobStore's filesystem api usage. This example demonstrates that in scala. Please merge it if you think it can be useful to others.
You can merge this Pull Request by running:
git pull https://github.com/adisesha/jclouds-examples master
Or you can view, comment on it, or merge it online at:
https://github.com/jclouds/jclouds-examples/pull/4
-- Commit Summary --
* Demonstrates usage of blobstore file system api in scala
* Formatted
-- File Changes --
A blobstore-scala-filesystem/README.md (13)
A blobstore-scala-filesystem/build.sbt (9)
A blobstore-scala-filesystem/src/main/scala/Main.scala (57)
-- Patch Links --
https://github.com/jclouds/jclouds-examples/pull/4.patch
https://github.com/jclouds/jclouds-examples/pull/4.diff
Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> +object Main {
> +
> + def main(args: Array[String]) {
> + require(args.length == 1,"Invalid number of parameters. Syntax is: \"basedirectory\" ")
> +
> + val baseDir=args(0)
> +
> + //Base directory property
> + val properties=new java.util.Properties()
> + properties.setProperty(FilesystemConstants.PROPERTY_BASEDIR,baseDir)
> +
> + val context = ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])
> +
> + try {
Can you replace this with a Scala `Try` block to make it less Java-like?
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
@demobox sorry I didn't notice your previous message until now. Once again, thanks for your time.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + val context = ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])
> +
> + try {
> + val blobStore = context.getBlobStore
> + blobStore.createContainerInLocation(null, "test")
> +
> + val blob = blobStore.blobBuilder("test").payload("testdata").build()
> + blobStore.putBlob("test", blob)
> +
> + val filePath = baseDir + System.getProperty("file.separator") + "test"
> + println(s"File ${'"'}test${'"'} stored under,$filePath")
> + } finally {
> + context.close()
> + }
> Does it make sense to introduce one library just for single case?
Well, this is an *example*, but in a real jclouds app you'd likely have many cases where the ARM code would be applicable. So I personally don't think it would be a bad idea to demonstrate this pattern to users.
The main reason I suggested this was to demonstrate some more idiomatic Scala and remove constructs that look very much like Java ported to Scala.
I think most developers that know a bit of Scala would not find it too hard to port the blobstore-basics demo to Scala line by line, so the benefit of a Scala example is enhanced, in my view, by focussing also on "good Scala style".
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
Closed #4.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + * 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.
> + */
> +import org.jclouds.blobstore.BlobStoreContext
> +import org.jclouds.ContextBuilder
> +import org.jclouds.filesystem.reference.FilesystemConstants
> +
> +
> +/**
> + * Demonstrates use of BlobStore filesystem api
> + * @author adisesha
> + */
> +object Main {
`extends App`? Seems more common Scala usage than a `main` method.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + val context = ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])
> +
> + try {
> + val blobStore = context.getBlobStore
> + blobStore.createContainerInLocation(null, "test")
> +
> + val blob = blobStore.blobBuilder("test").payload("testdata").build()
> + blobStore.putBlob("test", blob)
> +
> + val filePath = baseDir + System.getProperty("file.separator") + "test"
> + println(s"File ${'"'}test${'"'} stored under,$filePath")
> + } finally {
> + context.close()
> + }
See the [Scaladoc](http://www.scala-lang.org/api/current/index.html#scala.util.Try) or the "For comprehensions" section of this post: http://danielwestheide.com/blog/2012/12/26/the-neophytes-guide-to-scala-part-6-error-handling-with-try.html
But seeing as the context is a closable resource, using [Scala ARM](https://github.com/jsuereth/scala-arm/blob/master/notes/about.markdown) would probably make even more sense here.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> @@ -0,0 +1,9 @@
> +name :="blobstore-scala-filesystem"
> +
> +scalaVersion :="2.9.2"
Use a 2.10.x Scala version?
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
Ok. I thought you wanted me to squash last 2 commits. Now I squashed all my commits into single commit(5cef957). Let me know, if you intend it to be different.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> @@ -0,0 +1,13 @@
> +# blobstore-scala-filesystem
> +This is a simple example command line client that creates a container, and 'test' file in a [BlobStore](http://jclouds.incubator.apache.org/documentation/userguide/blobstore-guide/)
..."example command line client that creates a container and test blob in a filesystem \[BlobStore\](...) using Scala. This example..."
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> @@ -0,0 +1,13 @@
> +# blobstore-scala-filesystem
> +This is a simple example command line client that creates a container, and 'test' file in a [BlobStore](http://code.google.com/p/jclouds/wiki/BlobStore)
Please link to the Javadocs (http://javadocs.jclouds.cloudbees.net/) or new user guide (http://jclouds.incubator.apache.org/documentation/userguide/blobstore-guide/) instead.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
> +object Main {
> +
> + def main(args: Array[String]) {
> + require(args.length == 1,"Invalid number of parameters. Syntax is: \"basedirectory\" ")
> +
> + val baseDir=args(0)
> +
> + //Base directory property
> + val properties=new java.util.Properties()
> + properties.setProperty(FilesystemConstants.PROPERTY_BASEDIR,baseDir)
> +
> + val context = ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])
> +
> + try {
I am unable to find alternative for this. Can you please suggest one?
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
> + val context = ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])
> +
> + try {
> + val blobStore = context.getBlobStore
> + blobStore.createContainerInLocation(null, "test")
> +
> + val blob = blobStore.blobBuilder("test").payload("testdata").build()
> + blobStore.putBlob("test", blob)
> +
> + val filePath = baseDir + System.getProperty("file.separator") + "test"
> + println(s"File ${'"'}test${'"'} stored under,$filePath")
> + } finally {
> + context.close()
> + }
I looked at scala-arm after your first review. Does it make sense to introduce one library just for single case? Thanks for pointing to the article. I will look at this.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> it's a good Scala learning experience for me
Glad to hear! Then the reviews are serving their purpose ;-)
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + properties.setProperty(FilesystemConstants.PROPERTY_BASEDIR, baseDir)
> +
> + //Using scala-arm for context management. See https://github.com/jsuereth/scala-arm
> + managed(ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])).acquireFor(context => {
> +
> + val blobStore = context.getBlobStore
> + blobStore.createContainerInLocation(null, "test")
> +
> + val blob = blobStore.blobBuilder("test").payload("testdata").build()
> + blobStore.putBlob("test", blob)
> +
> + val filePath = baseDir + System.getProperty("file.separator") + "test"
> + println(s"File ${'"'}test${'"'} stored under,$filePath")
> +
```
println(s"File 'test' stored under: $filePath")
```
? Just so people don't have to try to figure out the string interpolation escape syntax for `"`...
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + require(args.length == 1, "Invalid number of parameters. Syntax is: \"basedirectory\" ")
> +
> + val baseDir = args(0)
> +
> + //Base directory property
> + val properties = new java.util.Properties()
> + properties.setProperty(FilesystemConstants.PROPERTY_BASEDIR, baseDir)
> +
> + //Using scala-arm for context management. See https://github.com/jsuereth/scala-arm
> + managed(ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext]))
> + .acquireAndGet(context => {
> +
> + val blobStore = context.getBlobStore
> + blobStore.createContainerInLocation(null, "test")
Rather than hardcoding the blob name, how about making that an argument to the application too?
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> +import org.jclouds.blobstore.BlobStoreContext
> +import org.jclouds.ContextBuilder
> +import org.jclouds.filesystem.reference.FilesystemConstants
> +import resource._
> +
> +
> +/**
> + * Demonstrates use of BlobStore filesystem api
> + * @author adisesha
> + */
> +object Main extends App {
> + require(args.length == 1, "Invalid number of parameters. Syntax is: \"basedirectory\" ")
> +
> + val baseDir = args(0)
> +
> + //Base directory property
`properties.setProperty(FilesystemConstants.PROPERTY_BASEDIR, baseDir)` says the same as this comment, so the comment should either explain more or be removed
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + * 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.
> + */
> +
> +import org.jclouds.blobstore.BlobStoreContext
> +import org.jclouds.ContextBuilder
> +import org.jclouds.filesystem.reference.FilesystemConstants
> +import resource._
> +
> +
> +/**
> + * Demonstrates use of BlobStore filesystem api
```
/**
* Demonstrates the use of the filesystem {@link BlobStore} in Scala
*
* Usage is: run \"basedir\"
*
* @author adisesha
*/
```
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
Closing PR because of too many commits
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
Done.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> @@ -0,0 +1,13 @@
> +# blobstore-scala-filesystem
> +This is a simple example command line client that creates a container, and 'test' file in a [BlobStore](http://jclouds.incubator.apache.org/documentation/userguide/blobstore-guide/)
> +using 'filesystem' api in scala. This example uses [scala-arm](https://github.com/jsuereth/scala-arm) for managing [BlobStoreContext](http://javadocs.jclouds.cloudbees.net/org/jclouds/blobstore/BlobStoreContext.html)
> +## Build
> +Ensure that sbt is installed. Tested with 0.12.2
> +## Run
> +Go to root of project and run sbt. Invoke 'run basedir'. 'basedir' is the folder where the container, and file will be stored
"Run sbt from the root of your project and invoke `run _basedir_`, where _basedir_ is a directory in which the container will be created. E.g. if your basedir is `/home/blobstore`, run
```
run /home/blobstore
```
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> Done.
Thanks! As a final step, could you squash all your commits?
@abayer Any Scala thoughts from you..? ;-)
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
What is the main purpose of this example: to demonstrate using _BlobStore_ from Scala, or to demonstrate using the _filesystem API_ from Scala? If the former, is there any specific reason to limit the example to a specific blobstore provider? Would it be useful to create a Scala version of [blobstore-basics](https://github.com/jclouds/jclouds-examples/blob/master/blobstore-basics/) instead?
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + * specific language governing permissions and limitations
> + * under the License.
> + */
> +
> +import org.jclouds.blobstore.BlobStoreContext
> +import org.jclouds.ContextBuilder
> +import org.jclouds.filesystem.reference.FilesystemConstants
> +import resource._
> +
> +
> +/**
> + * Demonstrates use of BlobStore filesystem api
> + * @author adisesha
> + */
> +object Main extends App {
> + require(args.length == 1, "Invalid number of parameters. Syntax is: \"basedirectory\" ")
`Usage is: run \"basedir\""`
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + * Demonstrates use of BlobStore filesystem api
> + * @author adisesha
> + */
> +object Main extends App {
> + require(args.length == 1, "Invalid number of parameters. Syntax is: \"basedirectory\" ")
> +
> + val baseDir = args(0)
> +
> + //Base directory property
> + val properties = new java.util.Properties()
> + properties.setProperty(FilesystemConstants.PROPERTY_BASEDIR, baseDir)
> +
> + //Using scala-arm for context management. See https://github.com/jsuereth/scala-arm
> + managed(ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])).acquireFor(context => {
Use `acquireAndGet` (since we're not using the `Either` return type of `acquireFor`) as in the example on the [usage page](http://jsuereth.com/scala-arm/usage.html)?
```
managed(ContextBuilder.newBuilder("filesystem").overrides(properties).buildView(classOf[BlobStoreContext])) acquireAndGet {
context =>
...
}
```
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
@adisesha Could you kindly squash this down to one commit when you have a minute? Looking forward to merging this!
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
I made changes based on your review. Thanks for the review.
My intention is to demonstrate 'filesystem' api usage. It's just that my actual project is in scala, I created this. I have not tried s3 or other providers. I need to use s3 in my project soon. I can rewrite [blobstore-basics](https://github.com/jclouds/jclouds-examples/blob/master/blobstore-basics/) when I am familiar with that.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> @@ -0,0 +1,10 @@
> +name :="blobstore-scala-filesystem"
> +
> +scalaVersion :="2.10.1"
> +
> +version :="1.0-SNAPSHOT"
> +
> +libraryDependencies ++= Seq( "org.jclouds.api" % "filesystem" % "1.6.0",
> + "com.google.code.findbugs" % "jsr305" % "1.3.+",
> + "com.jsuereth" %% "scala-arm" % "1.3"
[minor] Spacing before the scala-arm dep
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> Now I squashed all my commits into single commit
This pull request still contains 12 commits, it seems. Could you either update this PR or create a new one with your single, squashed commit? Thanks!
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
> + val context = ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])
> +
> + try {
> + val blobStore = context.getBlobStore
> + blobStore.createContainerInLocation(null, "test")
> +
> + val blob = blobStore.blobBuilder("test").payload("testdata").build()
> + blobStore.putBlob("test", blob)
> +
> + val filePath = baseDir + System.getProperty("file.separator") + "test"
> + println(s"File ${'"'}test${'"'} stored under,$filePath")
> + } finally {
> + context.close()
> + }
Makes sense. Done with changes. Next time, I will try to make it less painful to you :)
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Adi <no...@github.com>.
Done with changes. Once again, thanks for taking time to review this. Although it's a small example, it's a good Scala learning experience for me.
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> + //Base directory property
> + val properties=new java.util.Properties()
> + properties.setProperty(FilesystemConstants.PROPERTY_BASEDIR,baseDir)
> +
> + val context = ContextBuilder.newBuilder("filesystem")
> + .overrides(properties)
> + .buildView(classOf[BlobStoreContext])
> +
> + try {
> + val blobStore = context.getBlobStore
> + blobStore.createContainerInLocation(null, "test")
> +
> + val blob = blobStore.blobBuilder("test").payload("testdata").build()
> + blobStore.putBlob("test", blob)
> +
> + println("File \"test\" stored under,"+baseDir+System.getProperty("file.separator")+"test")
Use `s"..."` instead as it's nicer Scala syntax?
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
Back from vacation...final round of cleanup suggestions coming up!
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> sorry I didn't notice your previous message until now
No problem! I don't quite understand your last commit, though? Could you rebase your branch and squash all your commits so there's only **one** commit we need to merge? If that doesn't make any sense just let me know.
Thanks!
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> +
> +
> +/**
> + * Demonstrates use of BlobStore filesystem api
> + * @author adisesha
> + */
> +object Main extends App {
> + require(args.length == 1, "Invalid number of parameters. Syntax is: \"basedirectory\" ")
> +
> + val baseDir = args(0)
> +
> + //Base directory property
> + val properties = new java.util.Properties()
> + properties.setProperty(FilesystemConstants.PROPERTY_BASEDIR, baseDir)
> +
> + //Using scala-arm for context management. See https://github.com/jsuereth/scala-arm
[minor] `// Using`
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> @@ -0,0 +1,13 @@
> +# blobstore-scala-filesystem
> +This is a simple example command line client that creates a container, and 'test' file in a [BlobStore](http://jclouds.incubator.apache.org/documentation/userguide/blobstore-guide/)
> +using 'filesystem' api in scala. This example uses [scala-arm](https://github.com/jsuereth/scala-arm) for managing [BlobStoreContext](http://javadocs.jclouds.cloudbees.net/org/jclouds/blobstore/BlobStoreContext.html)
"...\[scala-arm\](...) to manage the [..."
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Re: [jclouds-examples] BlobStore file system api usage in scala (#4)
Posted by Andrew Phillips <no...@github.com>.
> Closing PR because of too many commits
Thanks...looking forward to the updated one!
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