?? lockmanagertest.java
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package lockmgr;import java.util.*;class LockManagerTest { static LockManager lm = new LockManager(); public static void main (String[] args) { test1(); //test2(); } static void test1() { System.out.println("Deadlock test"); Transaction t1 = new Transaction(1, "rl a sl 3000 wl b ua"); Transaction t2 = new Transaction(2, "rl b sl 10 wl a ua"); t1.start(); t2.start(); } static void test2() { System.out.println("Lock conversion test"); Transaction t1 = new Transaction(1, "rl a sl 10 wl a ua"); Transaction t2 = new Transaction(2, "rl a sl 2000 ua"); t1.start(); t2.start(); } static class Transaction extends Thread { int xid; StringTokenizer st; public Transaction(int xid, String ops) { this.xid = xid; st = new StringTokenizer(ops); } public void run() { try { while (st.hasMoreTokens()) { String opcode = st.nextToken(); if (opcode.equalsIgnoreCase("rl")) { String param = st.nextToken(); lm.lock(xid, param, LockManager.READ); System.out.println("Transaction " + xid + " got rl(" + param + ")"); } else if (opcode.equalsIgnoreCase("wl")) { String param = st.nextToken(); lm.lock(xid, param, LockManager.WRITE); System.out.println("Transaction " + xid + " got wl(" + param + ")"); } else if (opcode.equalsIgnoreCase("ua")) { lm.unlockAll(xid); } else if (opcode.equalsIgnoreCase("sl")) { String param = st.nextToken(); int sleepTime = Integer.parseInt(param); try { this.sleep(sleepTime); } catch (InterruptedException ie) { } } else { System.out.println("Unknown opcode " + opcode); break; } } } catch (DeadlockException de) { System.out.println("Transaction " + xid + ": Deadlock..."); } finally { lm.unlockAll(xid); } } }}?? 快捷鍵說明
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