com.oracle.bmc.hdfs.caching

Interface ConsistencyPolicy

All Known Implementing Classes:

NoOpConsistencyPolicy, StrongConsistencyPolicy

public interface ConsistencyPolicy

This interface controls how conflicting items are evicted. Implementations of this class should have a no-argument constructor.

Method Summary

Modifier and Type	Method and Description
CachingObjectStorage.GetObjectRequestCacheKey	constructKey(com.oracle.bmc.objectstorage.requests.GetObjectRequest request) Construct a cache key from the GetObjectRequest.
com.oracle.bmc.objectstorage.responses.GetObjectResponse	initiateRequest(com.oracle.bmc.objectstorage.ObjectStorage client, com.oracle.bmc.objectstorage.transfer.DownloadManager downloadManager, com.oracle.bmc.objectstorage.requests.GetObjectRequest request, CachingObjectStorage.GetObjectRequestCacheKey key, CachingObjectStorage.GetObjectResponseCacheValue previousValue) Initiate the request to get the object.

Method Detail

constructKey

CachingObjectStorage.GetObjectRequestCacheKey constructKey(com.oracle.bmc.objectstorage.requests.GetObjectRequest request)

Construct a cache key from the GetObjectRequest. Set everything that should be ignored when it comes to the keys to null.

Parameters:

request - request

Returns:

key

initiateRequest

com.oracle.bmc.objectstorage.responses.GetObjectResponse initiateRequest(com.oracle.bmc.objectstorage.ObjectStorage client,
                                                                         com.oracle.bmc.objectstorage.transfer.DownloadManager downloadManager,
                                                                         com.oracle.bmc.objectstorage.requests.GetObjectRequest request,
                                                                         CachingObjectStorage.GetObjectRequestCacheKey key,
                                                                         CachingObjectStorage.GetObjectResponseCacheValue previousValue)

Initiate the request to get the object. This can have three different outcomes: 1. Either a GetObjectResponse for data that should be put in the cache and returned; or 2. null if the data already in the cache should be used; or 3. An exception, which should be bubbled up

Parameters:

client - ObjectStorage client to use (uncached)

downloadManager - DownloadManager to use for downloading}

request - request to be made

key - cache key

previousValue - previous value or null

Returns:

GetObjectResponse or null or an exception