Method call

solr/core/src/test/org/apache/solr/core/SolrCoreTest.java:230–254

()

            }

            @Override
            public Integer call() {
              SolrCore core = null;
              int r = 0;
              try {
                for (int l = 0; l < LOOP; ++l) {
                  r += 1;
                  core = cores.getCore(SolrTestCaseJ4.DEFAULT_TEST_CORENAME);
                  // sprinkle concurrency hinting...
                  yieldInt(l);
                  assertTrue("Refcount < 1", core.getOpenCount() >= 1);
                  yieldInt(l);
                  assertTrue("Refcount > 17", core.getOpenCount() <= 17);
                  yieldInt(l);
                  assertFalse("Handler is closed", handler1.closed);
                  yieldInt(l);
                  core.close();
                  core = null;
                  yieldInt(l);
                }
                return r;
              } finally {
                if (core != null) core.close();
              }
            }
          };
      callees.add(call);
    }