com.avaje.ebean.bean.CallStack Maven / Gradle / Ivy
package com.avaje.ebean.bean;
import java.io.Serializable;
import java.util.Arrays;
/**
* Represent the call stack (stack trace elements).
*
* Used with a query to identify a CallStackQuery for AutoTune automatic query
* tuning.
*
*
* This is used so that a single query called from different methods can be
* tuned for each different call stack.
*
*
* Note the call stack is trimmed to remove the common ebean internal elements.
*
*/
public final class CallStack implements Serializable {
private static final long serialVersionUID = -8590644046907438579L;
private final String zeroHash;
private final String pathHash;
private final StackTraceElement[] callStack;
public CallStack(StackTraceElement[] callStack, int zeroHash, int pathHash) {
this.callStack = callStack;
this.zeroHash = enc(zeroHash);
this.pathHash = enc(pathHash);
}
public int hashCode() {
int hc = 0;
for (int i = 0; i < callStack.length; i++) {
hc = 31 * hc + callStack[i].hashCode();
}
return hc;
}
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof CallStack)) {
return false;
}
CallStack e = (CallStack) obj;
return Arrays.equals(callStack, e.callStack);
}
/**
* Return the first element of the call stack.
*/
public StackTraceElement getFirstStackTraceElement() {
return callStack[0];
}
/**
* Return the call stack.
*/
public StackTraceElement[] getCallStack() {
return callStack;
}
/**
* Return the hash for the first stack element.
*/
public String getZeroHash() {
return zeroHash;
}
/**
* Return the hash for the stack elements (excluding first stack element).
*/
public String getPathHash() {
return pathHash;
}
public String toString() {
return zeroHash + ":" + pathHash + ":" + callStack[0];
}
/**
* Return the call stack lines appended with the given newLine string.
*/
public String description(String newLine) {
StringBuilder sb = new StringBuilder(400);
for (int i = 0; i < callStack.length; i++) {
sb.append(callStack[i].toString()).append(newLine);
}
return sb.toString();
}
public String getOriginKey(int queryHash) {
return enc(queryHash)+ "." + zeroHash + "." + pathHash;
}
private static final int radix = 1 << 6;
private static final int mask = radix - 1;
/**
* Convert the integer to unsigned base 64.
*/
public static String enc(int i) {
char[] buf = new char[32];
int charPos = 32;
do {
buf[--charPos] = intToBase64[i & mask];
i >>>= 6;
} while (i != 0);
return new String(buf, charPos, (32 - charPos));
}
private static final char intToBase64[] = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
};
}