TestInternCache.java

package perf;

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import org.junit.Test;

/**
 * run with
 * <code>-verbose:gc -XX:+PrintGCDetails -Xloggc:gc.log</code>

 * get the total GC pause time
 * <code>$ grep "GC" gc.log | grep "Times: " | awk '{S+=$8}END{print S}'</code>
 * 
 * @author vladimir.dolzhenko@gmail.com
 * @since 2016-11-12
 */
public class TestInternCache {

	@Test
	public void collectGCTimings() throws Exception {
		StringBuilder builder = new StringBuilder("{");
		for(int i = 0; i < 10000; i++){
			if (i > 0) {
				builder.append(", \n");
			}
			builder.append('"')
					.append("someQName")
					.append(i)
					.append("\": ")
					.append(i);
		}
		builder.append("}");
			int c = 0;
		for(int i = 0; i < 5000; i++) {
			final JsonFactory factory = new JsonFactory();
			JsonParser parser = factory.createParser(builder.toString());
			while (parser.nextValue() != null) {
				JsonToken x = parser.currentToken();
				c += x.ordinal();
			}

		}
		System.out.println(c);
	}
}