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Move delete failure detection to the cache fetcher. #296

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Move delete failure detection to the cache fetcher. #296

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4 changes: 3 additions & 1 deletion lib/identity_cache/cache_fetcher.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,9 @@ def write(key, value)
end

def delete(key)
@cache_backend.write(key, IdentityCache::DELETED, :expires_in => IdentityCache::DELETED_TTL.seconds)
result = @cache_backend.write(key, IdentityCache::DELETED, expires_in: IdentityCache::DELETED_TTL.seconds)
IdentityCache.logger.debug { "[IdentityCache] delete #{ result ? 'recorded' : 'failed' } for #{key}" }
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@sirupsen sirupsen Oct 1, 2016 •
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The reason you're using blocks here is to avoid allocating the logging string unless you're at the debugging level?

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I was just doing it the way we were doing it before, but I think that is probably the reason.

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That is the reason.

result
end

def clear
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4 changes: 3 additions & 1 deletion lib/identity_cache/fallback_fetcher.rb
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Expand Up @@ -11,7 +11,9 @@ def write(key, value)
end

def delete(key)
@cache_backend.delete(key)
result = @cache_backend.delete(key)
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Why is it OK to do this in the fallback fetcher? What is the fallback fetcher?

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The fallback fetcher is just for compatibility for cache backends that don't support CAS operations. memcached_store is the only active support cache store that I know of that supports CAS.

The difference is that now it will just unconditionally log [IdentityCache] delete for #{key} with debug logging and won't attempt to indicate whether it failed or not.

IdentityCache.logger.debug { "[IdentityCache] delete for #{key}" }
result
end

def clear
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4 changes: 1 addition & 3 deletions lib/identity_cache/memoized_cache_proxy.rb
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Expand Up @@ -36,9 +36,7 @@ def write(key, value)

def delete(key)
memoized_key_values.delete(key) if memoizing?
result = @cache_fetcher.delete(key)
IdentityCache.logger.debug { "[IdentityCache] delete #{ result ? 'recorded' : 'failed' } for #{key}" }
result
@cache_fetcher.delete(key)
end

def fetch(key)
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