workqueue.html

用JAVA编写的,在做实验的时候留下来的,本来想删的,但是传上来,大家分享吧

<a name="141" href="#141">141</a>             }
<a name="142" href="#142">142</a>             <strong>if</strong>(peekItem != <strong>null</strong>) {
<a name="143" href="#143">143</a>                 lastPeeked = peekItem.toString();
<a name="144" href="#144">144</a>             }
<a name="145" href="#145">145</a>         }
<a name="146" href="#146">146</a>         <strong>return</strong> peekItem;
<a name="147" href="#147">147</a>     }
<a name="148" href="#148">148</a> 
<a name="149" href="#149">149</a>     <em>/**<em>*</em></em>
<a name="150" href="#150">150</a> <em>     * Remove the peekItem from the queue and adjusts the count.</em>
<a name="151" href="#151">151</a> <em>     * </em>
<a name="152" href="#152">152</a> <em>     * @param frontier  Work queues manager.</em>
<a name="153" href="#153">153</a> <em>     */</em>
<a name="154" href="#154">154</a>     <strong>public</strong> <strong>synchronized</strong> <strong>void</strong> dequeue(<strong>final</strong> <a href="../../../../org/archive/crawler/frontier/WorkQueueFrontier.html">WorkQueueFrontier</a> frontier) {
<a name="155" href="#155">155</a>         <strong>try</strong> {
<a name="156" href="#156">156</a>             deleteItem(frontier, peekItem);
<a name="157" href="#157">157</a>         } <strong>catch</strong> (IOException e) {
<a name="158" href="#158">158</a>             <em class="comment">//FIXME better exception handling</em>
<a name="159" href="#159">159</a>             e.printStackTrace();
<a name="160" href="#160">160</a>             <strong>throw</strong> <strong>new</strong> RuntimeException(e);
<a name="161" href="#161">161</a>         }
<a name="162" href="#162">162</a>         unpeek();
<a name="163" href="#163">163</a>         count--;
<a name="164" href="#164">164</a>         lastDequeueTime = System.currentTimeMillis();
<a name="165" href="#165">165</a>     }
<a name="166" href="#166">166</a> 
<a name="167" href="#167">167</a>     <em>/**<em>*</em></em>
<a name="168" href="#168">168</a> <em>     * Set the session 'activity budget balance' to the given value</em>
<a name="169" href="#169">169</a> <em>     * </em>
<a name="170" href="#170">170</a> <em>     * @param balance to use</em>
<a name="171" href="#171">171</a> <em>     */</em>
<a name="172" href="#172">172</a>     <strong>public</strong> <strong>void</strong> setSessionBalance(<strong>int</strong> balance) {
<a name="173" href="#173">173</a>         <strong>this</strong>.sessionBalance = balance;
<a name="174" href="#174">174</a>     }
<a name="175" href="#175">175</a> 
<a name="176" href="#176">176</a>     <em>/**<em>*</em></em>
<a name="177" href="#177">177</a> <em>     * Return current session 'activity budget balance' </em>
<a name="178" href="#178">178</a> <em>     * </em>
<a name="179" href="#179">179</a> <em>     * @return session balance</em>
<a name="180" href="#180">180</a> <em>     */</em>
<a name="181" href="#181">181</a>     <strong>public</strong> <strong>int</strong> getSessionBalance() {
<a name="182" href="#182">182</a>         <strong>return</strong> <strong>this</strong>.sessionBalance;
<a name="183" href="#183">183</a>     }
<a name="184" href="#184">184</a> 
<a name="185" href="#185">185</a>     <em>/**<em>*</em></em>
<a name="186" href="#186">186</a> <em>     * Set the total expenditure level allowable before queue is </em>
<a name="187" href="#187">187</a> <em>     * considered inherently 'over-budget'. </em>
<a name="188" href="#188">188</a> <em>     * </em>
<a name="189" href="#189">189</a> <em>     * @param budget</em>
<a name="190" href="#190">190</a> <em>     */</em>
<a name="191" href="#191">191</a>     <strong>public</strong> <strong>void</strong> setTotalBudget(<strong>long</strong> budget) {
<a name="192" href="#192">192</a>         <strong>this</strong>.totalBudget = budget;
<a name="193" href="#193">193</a>     }
<a name="194" href="#194">194</a> 
<a name="195" href="#195">195</a>     <em>/**<em>*</em></em>
<a name="196" href="#196">196</a> <em>     * Check whether queue has temporarily or permanently exceeded</em>
<a name="197" href="#197">197</a> <em>     * its budget. </em>
<a name="198" href="#198">198</a> <em>     * </em>
<a name="199" href="#199">199</a> <em>     * @return true if queue is over its set budget(s)</em>
<a name="200" href="#200">200</a> <em>     */</em>
<a name="201" href="#201">201</a>     <strong>public</strong> <strong>boolean</strong> isOverBudget() {
<a name="202" href="#202">202</a>         <em class="comment">// check whether running balance is depleted </em>
<a name="203" href="#203">203</a>         <em class="comment">// or totalExpenditure exceeds totalBudget</em>
<a name="204" href="#204">204</a>         <strong>return</strong> <strong>this</strong>.sessionBalance &lt;= 0
<a name="205" href="#205">205</a>             || (<strong>this</strong>.totalBudget >= 0 &amp;&amp; <strong>this</strong>.totalExpenditure > <strong>this</strong>.totalBudget);
<a name="206" href="#206">206</a>     }
<a name="207" href="#207">207</a> 
<a name="208" href="#208">208</a>     <em>/**<em>*</em></em>
<a name="209" href="#209">209</a> <em>     * Return the tally of all expenditures on this queue</em>
<a name="210" href="#210">210</a> <em>     * </em>
<a name="211" href="#211">211</a> <em>     * @return total amount expended on this queue</em>
<a name="212" href="#212">212</a> <em>     */</em>
<a name="213" href="#213">213</a>     <strong>public</strong> <strong>long</strong> getTotalExpenditure() {
<a name="214" href="#214">214</a>         <strong>return</strong> totalExpenditure;
<a name="215" href="#215">215</a>     }
<a name="216" href="#216">216</a> 
<a name="217" href="#217">217</a>     <em>/**<em>*</em></em>
<a name="218" href="#218">218</a> <em>     * Increase the internal running budget to be used before </em>
<a name="219" href="#219">219</a> <em>     * deactivating the queue</em>
<a name="220" href="#220">220</a> <em>     * </em>
<a name="221" href="#221">221</a> <em>     * @param amount amount to increment</em>
<a name="222" href="#222">222</a> <em>     * @return updated budget value</em>
<a name="223" href="#223">223</a> <em>     */</em>
<a name="224" href="#224">224</a>     <strong>public</strong> <strong>int</strong> incrementSessionBalance(<strong>int</strong> amount) {
<a name="225" href="#225">225</a>         <strong>this</strong>.sessionBalance = <strong>this</strong>.sessionBalance + amount;
<a name="226" href="#226">226</a>         <strong>return</strong> <strong>this</strong>.sessionBalance;
<a name="227" href="#227">227</a>     }
<a name="228" href="#228">228</a> 
<a name="229" href="#229">229</a>     <em>/**<em>*</em></em>
<a name="230" href="#230">230</a> <em>     * Decrease the internal running budget by the given amount. </em>
<a name="231" href="#231">231</a> <em>     * @param amount tp decrement</em>
<a name="232" href="#232">232</a> <em>     * @return updated budget value</em>
<a name="233" href="#233">233</a> <em>     */</em>
<a name="234" href="#234">234</a>     <strong>public</strong> <strong>int</strong> expend(<strong>int</strong> amount) {
<a name="235" href="#235">235</a>         <strong>this</strong>.sessionBalance = <strong>this</strong>.sessionBalance - amount;
<a name="236" href="#236">236</a>         <strong>this</strong>.totalExpenditure = <strong>this</strong>.totalExpenditure + amount;
<a name="237" href="#237">237</a>         <strong>this</strong>.lastCost = amount;
<a name="238" href="#238">238</a>         <strong>this</strong>.costCount++;
<a name="239" href="#239">239</a>         <strong>return</strong> <strong>this</strong>.sessionBalance;
<a name="240" href="#240">240</a>     }
<a name="241" href="#241">241</a> 
<a name="242" href="#242">242</a>     <em>/**<em>*</em></em>
<a name="243" href="#243">243</a> <em>     * A URI should not have been charged against queue (eg</em>
<a name="244" href="#244">244</a> <em>     * it was disregarded); return the amount expended </em>
<a name="245" href="#245">245</a> <em>     * @param amount to return</em>
<a name="246" href="#246">246</a> <em>     * @return updated budget value</em>
<a name="247" href="#247">247</a> <em>     */</em>
<a name="248" href="#248">248</a>     <strong>public</strong> <strong>int</strong> refund(<strong>int</strong> amount) {
<a name="249" href="#249">249</a>         <strong>this</strong>.sessionBalance = <strong>this</strong>.sessionBalance + amount;
<a name="250" href="#250">250</a>         <strong>this</strong>.totalExpenditure = <strong>this</strong>.totalExpenditure - amount;
<a name="251" href="#251">251</a>         <strong>this</strong>.costCount--;
<a name="252" href="#252">252</a>         <strong>return</strong> <strong>this</strong>.sessionBalance;
<a name="253" href="#253">253</a>     }
<a name="254" href="#254">254</a>     
<a name="255" href="#255">255</a>     <em>/**<em>*</em></em>
<a name="256" href="#256">256</a> <em>     * Note an error and assess an extra penalty. </em>
<a name="257" href="#257">257</a> <em>     * @param penalty additional amount to deduct</em>
<a name="258" href="#258">258</a> <em>     */</em>
<a name="259" href="#259">259</a>     <strong>public</strong> <strong>void</strong> noteError(<strong>int</strong> penalty) {
<a name="260" href="#260">260</a>         <strong>this</strong>.sessionBalance = <strong>this</strong>.sessionBalance - penalty;
<a name="261" href="#261">261</a>         <strong>this</strong>.totalExpenditure = <strong>this</strong>.totalExpenditure + penalty;
<a name="262" href="#262">262</a>         errorCount++;
<a name="263" href="#263">263</a>     }
<a name="264" href="#264">264</a>     
<a name="265" href="#265">265</a>     <em>/**<em>*</em></em>
<a name="266" href="#266">266</a> <em>     * @param l</em>
<a name="267" href="#267">267</a> <em>     */</em>
<a name="268" href="#268">268</a>     <strong>public</strong> <strong>void</strong> setWakeTime(<strong>long</strong> l) {
<a name="269" href="#269">269</a>         wakeTime = l;
<a name="270" href="#270">270</a>     }
<a name="271" href="#271">271</a> 
<a name="272" href="#272">272</a>     <em>/**<em>*</em></em>
<a name="273" href="#273">273</a> <em>     * @return wakeTime</em>
<a name="274" href="#274">274</a> <em>     */</em>
<a name="275" href="#275">275</a>     <strong>public</strong> <strong>long</strong> getWakeTime() {
<a name="276" href="#276">276</a>         <strong>return</strong> wakeTime;
<a name="277" href="#277">277</a>     }
<a name="278" href="#278">278</a> 
<a name="279" href="#279">279</a>     <em>/**<em>*</em></em>
<a name="280" href="#280">280</a> <em>     * @return classKey, the 'identifier', for this queue.</em>
<a name="281" href="#281">281</a> <em>     */</em>
<a name="282" href="#282">282</a>     <strong>public</strong> String getClassKey() {
<a name="283" href="#283">283</a>         <strong>return</strong> <strong>this</strong>.classKey;
<a name="284" href="#284">284</a>     }
<a name="285" href="#285">285</a> 
<a name="286" href="#286">286</a>     <em>/**<em>*</em></em>
<a name="287" href="#287">287</a> <em>     * Clear isHeld to false</em>
<a name="288" href="#288">288</a> <em>     */</em>
<a name="289" href="#289">289</a>     <strong>public</strong> <strong>void</strong> clearHeld() {