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/*
* Copyright 2013-2016 ksyun.com, Inc. or its affiliates. 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.
* A copy of the License is located at
*
* http://ksyun.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.ksc.regions;
import com.ksc.KscClientException;
import com.ksc.ClientConfiguration;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.util.List;
/**
* Utilities for working with regions.
*/
public class RegionUtils {
private static volatile RegionMetadata regionMetadata;
/*
* Convenience methods that access the singleton RegionMetadata instance
* maintained by this class, lazily initializing it if need be.
*/
/**
* Returns the current set of region metadata for this process,
* initializing it if it has not yet been explicitly initialized before.
*
* @return the current set of region metadata
*/
public static RegionMetadata getRegionMetadata() {
RegionMetadata rval = regionMetadata;
if (rval != null) {
return rval;
}
synchronized (RegionUtils.class) {
if (regionMetadata == null) {
initialize();
}
}
return regionMetadata;
}
/**
* Initializes the region metadata by loading from the default hierarchy
* of region metadata locations.
*/
public static void initialize() {
regionMetadata = RegionMetadataFactory.create();
}
/**
* Directly sets the singleton {@code RegionMetadata} instance.
*
* @param metadata the new region metadata object
*/
public static void initializeWithMetadata(final RegionMetadata metadata) {
if (metadata == null) {
throw new IllegalArgumentException("metadata cannot be null");
}
regionMetadata = metadata;
}
/**
* Returns a list of the available KSC regions.
*/
public static List getRegions() {
return getRegionMetadata().getRegions();
}
/**
* Returns a list of the regions that support the service given.
*
* @see ServiceAbbreviations
*/
public static List getRegionsForService(
String serviceAbbreviation) {
return getRegionMetadata().getRegionsForService(serviceAbbreviation);
}
/**
* Returns the region with the id given, if it exists. Otherwise, returns
* null.
*/
public static Region getRegion(String regionName) {
return getRegionMetadata().getRegion(regionName);
}
/*
* Methods for loading a RegionMetadata object from various locations.
*/
/**
* Loads a set of region metadata by downloading an XML file from the
* given URI and parsing it.
*
* @param uri the uri of the XML file to parse
* @return the parsed region metadata
* @throws IOException on error fetching or parsing the XML file
*/
@Deprecated
public static RegionMetadata loadMetadataFromURI(final URI uri)
throws IOException {
return loadMetadataFromURI(uri, null);
}
/**
* Loads a set of region metadata by downloading an XML file from the
* given URI and parsing it.
*
* @param uri the uri of the XML file to parse
* @param config configuration for the HTTP client to use to fetch the file
* @return the parsed region metadata
* @throws IOException on error fetching or parsing the XML file
*/
@Deprecated
public static RegionMetadata loadMetadataFromURI(
final URI uri,
final ClientConfiguration config) throws IOException {
return LegacyRegionXmlLoadUtils.load(uri, config);
}
/**
* Loads a set of region metadata from an XML file on disk.
*
* @param file the file to load from
* @return the loaded region metadata
* @throws IOException on error opening or reading from the file
*/
@Deprecated
public static RegionMetadata loadMetadataFromFile(final File file)
throws IOException {
return LegacyRegionXmlLoadUtils.load(file);
}
/**
* Loads a set of region metadata from an XML file stored as a resource
* of the classloader used to load the RegionUtils class.
*
* @param name the path of the resource, relative to the RegionUtils class
* @return the parsed region metadata
* @throws IOException if the resource is not found or cannot be parsed
*/
@Deprecated
public static RegionMetadata loadMetadataFromResource(final String name)
throws IOException {
return LegacyRegionXmlLoadUtils.load(RegionUtils
.class, name);
}
/**
* Loads a set of region metadata from an XML file stored as a resource of
* the classloader used to load the given class.
*
* @param clazz the class to use as a base for the resource
* @param name the path to the resource, relative to the given class
* @return the parsed region metadata
* @throws IOException if the resource is not found or cannot be parsed
*/
@Deprecated
public static RegionMetadata loadMetadataFromResource(
final Class clazz,
final String name) throws IOException {
return LegacyRegionXmlLoadUtils.load(clazz, name);
}
/**
* Loads a set of region metadata from an XML file stored as a resource
* of the given classloader.
*
* @param classLoader the class loader to load the resource from
* @param name the path to the resource
* @return the parsed region metadata
* @throws IOException if the resource is not found or cannot be parsed
*/
@Deprecated
public static RegionMetadata loadMetadataFromResource(
final ClassLoader classLoader,
final String name) throws IOException {
return LegacyRegionXmlLoadUtils.load(classLoader,
name);
}
/**
* Loads a set of region metadata from an arbitrary {@code InputStream}
* containing an XML file.
*
* @param stream the stream to load from
* @return the loaded region metadata
* @throws IOException on error reading from the stream
*/
@Deprecated
public static RegionMetadata loadMetadataFromInputStream(
final InputStream stream) throws IOException {
return LegacyRegionXmlLoadUtils.load(stream);
}
/*
* Methods for initializing the process-wide singleton RegionMetadata
* instance.
*/
/**
* This method no longer attempts to retrieve region metadata from
* CloudFront, as that file is no longer being maintained and the version
* bundled with the SDK is likely to be more up-to-date.
*
* It's deprecated to signal that it no longer has any possibility of
* retrieving a newer set of metadata than was previously loaded. If you
* are simply wanting to reinitialize from the bundled region metadata,
* call {@code initialize}. If you want to maintain your own remote
* copy of the region metadata and periodically refresh it at runtime,
* call {@code initializeFromURI}.
*
* @deprecated in favor of {@link #initialize()}
*/
@Deprecated
public static void init() {
initialize();
}
/**
* Loads a set of region metadata by downloading an XML file from the
* given URI and parsing it.
*
* @param uri the uri of the XML file to parse
* @throws KscClientException on error
*/
@Deprecated
public static synchronized void initializeFromURI(final URI uri) {
initializeFromURI(uri, null);
}
/**
* Loads a set of region metadata by downloading an XML file from the
* given URI and parsing it.
*
* @param uri the uri of the XML file to parse
* @param config configuration for the HTTP client to use to fetch the file
* @throws KscClientException on error
*/
@Deprecated
public static synchronized void initializeFromURI(
final URI uri,
final ClientConfiguration config) {
try {
regionMetadata = loadMetadataFromURI(uri, config);
} catch (IOException exception) {
throw new KscClientException(
"Error parsing region metadata from " + uri,
exception);
}
}
/**
* Initializes the region metadata singleton from an XML file on disk.
*
* @param file the file to load from
* @throws KscClientException on error opening or reading from the file
*/
@Deprecated
public static synchronized void initializeFromFile(final File file) {
try {
regionMetadata = loadMetadataFromFile(file);
} catch (IOException exception) {
throw new KscClientException(
"Error parsing region metadata from " + file,
exception);
}
}
/**
* Initializes the region metadata singleton from an XML file stored as a
* resource of the classloader used to load the RegionUtils class.
*
* @param name the path of the resource, relative to the RegionUtils class
* @throws KscClientException on error
*/
@Deprecated
public static synchronized void initializeFromResource(final String name) {
initializeFromResource(RegionUtils.class, name);
}
/**
* Initializes the region metadata singleton from the given resource.
*
* @param clazz the class to use as a base for the resource
* @param name the path to the resource, relative to the given class
* @throws KscClientException on error
*/
@Deprecated
public static synchronized void initializeFromResource(
final Class clazz,
final String name) {
try {
regionMetadata = loadMetadataFromResource(clazz, name);
} catch (IOException exception) {
throw new KscClientException(
"Error parsing region metadata from resource " + name,
exception);
}
}
/**
* Initializes the region metadata singleton from the given resource.
*
* @param classLoader the class loader to use to load the resource
* @param name the path to the resource
* @throws KscClientException on error
*/
@Deprecated
public static synchronized void initializeFromResource(
final ClassLoader classLoader,
final String name) {
try {
regionMetadata = loadMetadataFromResource(classLoader, name);
} catch (IOException exception) {
throw new KscClientException(
"Error parsing region metadata from resource " + name,
exception);
}
}
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