Improve TransientStore API

The TransientStore API, the TransientStoreService and the related interfaces have been improved mainly to:

Be more consistent

The StorageEntry interface now:

• Handles putting and getting a map of parameters

  void putAll(Map<String, Serializable> params)
  
  Map<String, Serializable> getParameters()
  

• Only provides one method to add blobs

  void setBlobs(List<Blob> blobs)
  

Define a default transient store configuration

The templates/common/config/transient-store-config.xml.nxftl contribution defines the "default" transient store:

<#if "${nuxeo.redis.enabled}" == "true">
  <#assign className = "org.nuxeo.ecm.core.redis.contribs.RedisTransientStore" />
<#else>
  <#assign className = "org.nuxeo.ecm.core.transientstore.SimpleTransientStore" />
</#if>

<extension target="org.nuxeo.ecm.core.transientstore.TransientStorageComponent"
  point="store">

  <store name="default" class="${className}">
    <targetMaxSizeMB>-1</targetMaxSizeMB>
    <absoluteMaxSizeMB>-1</absoluteMaxSizeMB>
    <fistLevelTTL>120</fistLevelTTL>
    <secondLevelTTL>10</secondLevelTTL>
    <minimalRetention>10</minimalRetention>
  </store>

</extension>

We can see that its implementation depends on the nuxeo.redis.enabled property, using the RedisTransientStore implementation if Redis is enabled and the SimpleTransientStore otherwise.

When getting a store with TransientStoreService#getStore(String name) if the store doesn't exist a fallback is done on the "default" one.