
io.ebeaninternal.server.core.DefaultCallStackFactory Maven / Gradle / Ivy
package io.ebeaninternal.server.core;
import io.ebean.bean.CallStack;
import java.util.Arrays;
/**
* Default CallStackFactory where the Hash function for StackTraceElement includes the line number.
*/
public class DefaultCallStackFactory implements CallStackFactory {
private static final int IGNORE_LEADING_ELEMENTS = 5;
private static final String IO_EBEAN = "io.ebean";
private final int maxCallStack;
DefaultCallStackFactory(int maxCallStack) {
this.maxCallStack = maxCallStack;
}
@Override
public CallStack createCallStack() {
StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
// ignore the first 6 as they are always avaje stack elements
int startIndex = IGNORE_LEADING_ELEMENTS;
// find the first non-avaje stackElement
for (; startIndex < stackTrace.length; startIndex++) {
if (!stackTrace[startIndex].getClassName().startsWith(IO_EBEAN)) {
break;
}
}
int stackLength = stackTrace.length - startIndex;
if (stackLength > maxCallStack) {
// maximum of maxCallStack stackTrace elements
stackLength = maxCallStack;
}
// create the 'interesting' part of the stackTrace
StackTraceElement[] finalTrace = new StackTraceElement[stackLength];
System.arraycopy(stackTrace, startIndex, finalTrace, 0, stackLength);
if (stackLength < 1) {
// this should not really happen
throw new RuntimeException("StackTraceElement size 0? stack: " + Arrays.toString(stackTrace));
}
return createCallStack(finalTrace);
}
private CallStack createCallStack(StackTraceElement[] finalTrace) {
return new CallStack(finalTrace, finalTrace[0].hashCode(), pathHash(finalTrace));
}
/**
* Return the hash code for the path excluding the first element.
*/
private int pathHash(StackTraceElement[] callStack) {
int hc = 0;
for (int i = 1; i < callStack.length; i++) {
hc = 92821 * hc + callStack[i].hashCode();
}
return hc;
}
}
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