@Override public Builder searchEnabled(boolean searchEnabled) {
      this.searchEnabled = searchEnabled;
      return this;
    }
Test storage component that keeps all spans in memory, accepting them on the calling thread.

<p>Internally, spans are indexed on 64-bit trace ID

<p>Here's an example of some traces in memory:

<pre>{@code
spansByTraceIdTimeStamp:
   <aaaa,July 4> --> ( spanA(time:July 4, traceId:aaaa, service:foo, name:GET),
                       spanB(time:July 4, traceId:aaaa, service:bar, name:GET) )
   <cccc,July 4> --> ( spanC(time:July 4, traceId:aaaa, service:foo, name:GET) )
   <bbbb,July 5> --> ( spanD(time:July 5, traceId:bbbb, service:biz, name:GET) )
   <bbbb,July 6> --> ( spanE(time:July 6, traceId:bbbb) service:foo, name:POST )

traceIdToTraceIdTimeStamps:
   aaaa --> [ <aaaa,July 4> ]
   bbbb --> [ <bbbb,July 5>, <bbbb,July 6> ]
   cccc --> [ <cccc,July 4> ]

serviceToTraceIds:
   foo --> [ <aaaa>, <cccc>, <bbbb> ]
   bar --> [ <aaaa> ]
   biz --> [ <bbbb> ]

serviceToSpanNames:
   bar --> ( GET )
   biz --> ( GET )
   foo --> ( GET, POST )
}</pre>
zipkin/src/main/java/zipkin2/storage/InMemoryStorage.java