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NIO Filesystem Provider for Google Cloud Storage (Alpha) | ||
======================================================== | ||
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Implementation of Java 7 `java.nio.file.FileSystem` for | ||
[Google Cloud Storage](https://cloud.google.com/storage/). | ||
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This library allows you to use the standardized Java file system API | ||
for interacting with Google Cloud Storage. | ||
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[![Build Status](https://travis-ci.org/GoogleCloudPlatform/gcloud-java.svg?branch=master)](https://travis-ci.org/GoogleCloudPlatform/gcloud-java) | ||
[![Coverage Status](https://coveralls.io/repos/GoogleCloudPlatform/gcloud-java/badge.svg?branch=master)](https://coveralls.io/r/GoogleCloudPlatform/gcloud-java?branch=master) | ||
[![Maven](https://img.shields.io/maven-central/v/com.google.cloud/gcloud-java-nio.svg)]( https://img.shields.io/maven-central/v/com.google.cloud/gcloud-java-nio.svg) | ||
[![Codacy Badge](https://api.codacy.com/project/badge/grade/9da006ad7c3a4fe1abd142e77c003917)](https://www.codacy.com/app/mziccard/gcloud-java) | ||
[![Dependency Status](https://www.versioneye.com/user/projects/56bd8ee72a29ed002d2b0969/badge.svg?style=flat)](https://www.versioneye.com/user/projects/56bd8ee72a29ed002d2b0969) | ||
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- [Homepage](https://googlecloudplatform.github.io/gcloud-java/) | ||
- [API Documentation](http://googlecloudplatform.github.io/gcloud-java/apidocs/index.html?com/google/cloud/storage/package-summary.html) | ||
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> Note: This client is a work-in-progress, and may occasionally | ||
> make backwards-incompatible changes. | ||
Quickstart | ||
---------- | ||
If you are using Maven, add this to your pom.xml file | ||
```xml | ||
<dependency> | ||
<groupId>com.google.cloud</groupId> | ||
<artifactId>gcloud-java-nio</artifactId> | ||
<version>0.2.3</version> | ||
</dependency> | ||
``` | ||
If you are using Gradle, add this to your dependencies | ||
```Groovy | ||
compile 'com.google.cloud:gcloud-java-nio:0.2.3' | ||
``` | ||
If you are using SBT, add this to your dependencies | ||
```Scala | ||
libraryDependencies += "com.google.cloud" % "gcloud-java-nio" % "0.2.3" | ||
``` | ||
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Example Applications | ||
------------------- | ||
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* [`Stat`](../../gcloud-java-examples/src/main/java/com/google/cloud/examples/nio/Stat.java) | ||
shows how to get started with NIO. | ||
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* [`ParallelCountBytes`](../../gcloud-java-examples/src/main/java/com/google/cloud/examples/nio/ParallelCountBytes.java) | ||
efficiently downloads a file from Google Cloud Storage. | ||
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* [`ListFileSystems`](../gcloud-java-nio-examples/README.md) illustrates how | ||
NIO can add Google Cloud Storage support to some legacy programs, without | ||
having to modify them. | ||
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Authentication | ||
-------------- | ||
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See the [Authentication](https://github.com/GoogleCloudPlatform/gcloud-java#authentication) | ||
section in the base directory's README. | ||
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About Google Cloud Storage | ||
-------------------------- | ||
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[Google Cloud Storage][cloud-storage] is a durable and highly available | ||
object storage service. Google Cloud Storage is almost infinitely scalable | ||
and guarantees consistency: when a write succeeds, the latest copy of the | ||
object will be returned to any GET, globally. | ||
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See the [Google Cloud Storage docs][cloud-storage-activation] for more details | ||
on how to activate Cloud Storage for your project. | ||
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About Java NIO Providers | ||
------------------------ | ||
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Java NIO Providers is an extension mechanism that is part of Java and allows | ||
third parties to extend Java's [normal File API][java-file-api] to support | ||
additional filesystems. | ||
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Getting Started | ||
--------------- | ||
#### Prerequisites | ||
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For this tutorial, you will need a [Google Developers | ||
Console](https://console.developers.google.com/) project with "Google Cloud | ||
Storage" and "Google Cloud Storage JSON API" enabled via the console's API | ||
Manager. You will need to [enable | ||
billing](https://support.google.com/cloud/answer/6158867?hl=en) to use Google | ||
Cloud Storage. [Follow these | ||
instructions](https://cloud.google.com/docs/authentication#preparation) to get | ||
your project set up. You will also need to set up the local development | ||
environment by [installing the Google Cloud SDK](https://cloud.google.com/sdk/) | ||
and running the following commands in command line: `gcloud auth login` and | ||
`gcloud config set project [YOUR PROJECT ID]`. | ||
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#### Installation and setup | ||
You'll need to obtain the `gcloud-java-nio` library. | ||
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There are two ways to use this library. | ||
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The recommended way is to follow the [Quickstart](#quickstart) section to add | ||
`gcloud-java-nio` as a dependency in your code. | ||
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The second way is more complicated, but it allows you to add Google Cloud | ||
Storage support to some legacy Java programs. This approach is described in the | ||
[gcloud-java-nio-examples README](../gcloud-java-nio-examples/README.md). | ||
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#### Accessing files | ||
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The simplest way to get started is with `Paths` and `Files`: | ||
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Path path = Paths.get(URI.create("gs://bucket/lolcat.csv")); | ||
List<String> lines = Files.readAllLines(path, StandardCharsets.UTF_8); | ||
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If you know the paths will point to Google Cloud Storage, you can also use the | ||
direct formulation: | ||
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try (CloudStorageFileSystem fs = CloudStorageFileSystem.forBucket("bucket") { | ||
Path path = fs.getPath("lolcat.csv"); | ||
List<String> lines = Files.readAllLines(path, StandardCharsets.UTF_8); | ||
} | ||
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Once you have a `Path` you can use it as you would a normal file. For example | ||
you can use `InputStream` and `OutputStream` for streaming: | ||
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try (InputStream input = Files.openInputStream(path)) { | ||
// ... | ||
} | ||
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You can also set various attributes using CloudStorageOptions static helpers: | ||
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Files.write(csvPath, csvLines, StandardCharsets.UTF_8, | ||
withMimeType(MediaType.CSV_UTF8), | ||
withoutCaching()); | ||
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Limitations | ||
----------- | ||
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This library is usable, but not yet complete. The following features are not | ||
yet implemented: | ||
* Listing all the buckets | ||
* Resuming upload or download | ||
* Generations | ||
* File attributes | ||
* (more) | ||
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Some features are not on the roadmap: this library would be a poor choice to | ||
mirror a local filesystem onto the cloud because Google Cloud Storage has a | ||
different set of features from your local disk. This library, by design, | ||
does not mask those differences. Rather, it aims to expose the common | ||
subset via a familiar interface. | ||
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**NOTE:** Cloud Storage uses a flat namespace and therefore doesn't support real | ||
directories. So this library supports what's known as "pseudo-directories". Any | ||
path that includes a trailing slash, will be considered a directory. It will | ||
always be assumed to exist, without performing any I/O. This allows you to do | ||
path manipulation in the same manner as you would with the normal UNIX file | ||
system implementation. You can disable this feature with | ||
`CloudStorageConfiguration.usePseudoDirectories()`. | ||
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#### Complete source code | ||
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There are examples in [gcloud-java-examples](../gcloud-java-examples/src/main/java/com/google/cloud/examples/nio/) | ||
for your perusal. | ||
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Java Versions | ||
------------- | ||
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Java 7 or above is required for using this client. | ||
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Versioning | ||
---------- | ||
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This library follows [Semantic Versioning](http://semver.org/). | ||
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It is currently in major version zero (``0.y.z``), which means that anything | ||
may change at any time and the public API should not be considered | ||
stable. | ||
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Contributing | ||
------------ | ||
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Contributions to this library are always welcome and highly encouraged. | ||
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See `gcloud-java`'s [CONTRIBUTING] documentation and the `gcloud-*` | ||
[shared documentation](https://github.com/GoogleCloudPlatform/gcloud-common/blob/master/contributing/readme.md#how-to-contribute-to-gcloud) | ||
for more information on how to get started. | ||
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Please note that this project is released with a Contributor Code of Conduct. | ||
By participating in this project you agree to abide by its terms. See | ||
[Code of Conduct][code-of-conduct] for more information. | ||
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License | ||
------- | ||
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Apache 2.0 - See [LICENSE] for more information. | ||
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[CONTRIBUTING]:https://github.com/GoogleCloudPlatform/gcloud-java/blob/master/CONTRIBUTING.md | ||
[code-of-conduct]:https://github.com/GoogleCloudPlatform/gcloud-java/blob/master/CODE_OF_CONDUCT.md#contributor-code-of-conduct | ||
[LICENSE]: https://github.com/GoogleCloudPlatform/gcloud-java/blob/master/LICENSE | ||
[TESTING]: https://github.com/GoogleCloudPlatform/gcloud-java/blob/master/TESTING.md#testing-code-that-uses-storage | ||
[cloud-platform]: https://cloud.google.com/ | ||
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[cloud-storage]: https://cloud.google.com/storage/ | ||
[cloud-storage-docs]: https://cloud.google.com/storage/docs/overview | ||
[cloud-storage-create-bucket]: https://cloud.google.com/storage/docs/cloud-console#_creatingbuckets | ||
[storage-api]: http://googlecloudplatform.github.io/gcloud-java/apidocs/index.html?com/google/cloud/storage/package-summary.html | ||
[cloud-storage-activation]:https://cloud.google.com/storage/docs/signup?hl=en | ||
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[java-file-api]: https://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html |