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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.util;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.io.BufferedReader;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.io.IOException;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.io.InputStream;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.io.InputStreamReader;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.lang.management.ManagementFactory;</span> |
| <span class="source-line-no">025</span><span id="line-25">import java.lang.management.OperatingSystemMXBean;</span> |
| <span class="source-line-no">026</span><span id="line-26">import java.lang.management.RuntimeMXBean;</span> |
| <span class="source-line-no">027</span><span id="line-27">import java.lang.reflect.Method;</span> |
| <span class="source-line-no">028</span><span id="line-28">import java.nio.charset.StandardCharsets;</span> |
| <span class="source-line-no">029</span><span id="line-29">import java.util.Iterator;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.slf4j.Logger;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">033</span><span id="line-33"></span> |
| <span class="source-line-no">034</span><span id="line-34">import org.apache.hbase.thirdparty.com.google.common.base.Splitter;</span> |
| <span class="source-line-no">035</span><span id="line-35"></span> |
| <span class="source-line-no">036</span><span id="line-36">/**</span> |
| <span class="source-line-no">037</span><span id="line-37"> * This class is a wrapper for the implementation of com.sun.management.UnixOperatingSystemMXBean It</span> |
| <span class="source-line-no">038</span><span id="line-38"> * will decide to use the sun api or its own implementation depending on the runtime (vendor) used.</span> |
| <span class="source-line-no">039</span><span id="line-39"> */</span> |
| <span class="source-line-no">040</span><span id="line-40"></span> |
| <span class="source-line-no">041</span><span id="line-41">@InterfaceAudience.Private</span> |
| <span class="source-line-no">042</span><span id="line-42">public class JVM {</span> |
| <span class="source-line-no">043</span><span id="line-43"> private static final Logger LOG = LoggerFactory.getLogger(JVM.class);</span> |
| <span class="source-line-no">044</span><span id="line-44"> private OperatingSystemMXBean osMbean;</span> |
| <span class="source-line-no">045</span><span id="line-45"></span> |
| <span class="source-line-no">046</span><span id="line-46"> private static final boolean ibmvendor =</span> |
| <span class="source-line-no">047</span><span id="line-47"> System.getProperty("java.vendor") != null && System.getProperty("java.vendor").contains("IBM");</span> |
| <span class="source-line-no">048</span><span id="line-48"> // At least on my systems os.name reports as "linux", not "Linux". Prefer case insensitive tests.</span> |
| <span class="source-line-no">049</span><span id="line-49"> private static final boolean windows = System.getProperty("os.name") != null</span> |
| <span class="source-line-no">050</span><span id="line-50"> && System.getProperty("os.name").toLowerCase().contains("windows");</span> |
| <span class="source-line-no">051</span><span id="line-51"> private static final boolean linux = System.getProperty("os.name") != null</span> |
| <span class="source-line-no">052</span><span id="line-52"> && System.getProperty("os.name").toLowerCase().contains("linux");</span> |
| <span class="source-line-no">053</span><span id="line-53"> private static final boolean amd64 =</span> |
| <span class="source-line-no">054</span><span id="line-54"> System.getProperty("os.arch") != null && System.getProperty("os.arch").contains("amd64");</span> |
| <span class="source-line-no">055</span><span id="line-55"> private static final boolean aarch64 =</span> |
| <span class="source-line-no">056</span><span id="line-56"> System.getProperty("os.arch") != null && System.getProperty("os.arch").contains("aarch64");</span> |
| <span class="source-line-no">057</span><span id="line-57"></span> |
| <span class="source-line-no">058</span><span id="line-58"> private static final String JVMVersion = System.getProperty("java.version");</span> |
| <span class="source-line-no">059</span><span id="line-59"></span> |
| <span class="source-line-no">060</span><span id="line-60"> /**</span> |
| <span class="source-line-no">061</span><span id="line-61"> * The raw String of java specification version. "1.8" for java8, "9","10"... for Java 9, 10...</span> |
| <span class="source-line-no">062</span><span id="line-62"> */</span> |
| <span class="source-line-no">063</span><span id="line-63"> private static final String JVM_SPEC_VERSION_STRING =</span> |
| <span class="source-line-no">064</span><span id="line-64"> System.getProperty("java.specification.version");</span> |
| <span class="source-line-no">065</span><span id="line-65"></span> |
| <span class="source-line-no">066</span><span id="line-66"> /**</span> |
| <span class="source-line-no">067</span><span id="line-67"> * The Integer represent of JVM_SPEC_VERSION, for the JVM version comparison. Java 8, 9, 10 ...</span> |
| <span class="source-line-no">068</span><span id="line-68"> * will be noted as 8, 9 10 ...</span> |
| <span class="source-line-no">069</span><span id="line-69"> */</span> |
| <span class="source-line-no">070</span><span id="line-70"> private static final int JVM_SPEC_VERSION = JVM_SPEC_VERSION_STRING.contains(".")</span> |
| <span class="source-line-no">071</span><span id="line-71"> ? (int) (Float.parseFloat(JVM_SPEC_VERSION_STRING) * 10 % 10)</span> |
| <span class="source-line-no">072</span><span id="line-72"> : Integer.parseInt(JVM_SPEC_VERSION_STRING);</span> |
| <span class="source-line-no">073</span><span id="line-73"></span> |
| <span class="source-line-no">074</span><span id="line-74"> /**</span> |
| <span class="source-line-no">075</span><span id="line-75"> * Constructor. Get the running Operating System instance</span> |
| <span class="source-line-no">076</span><span id="line-76"> */</span> |
| <span class="source-line-no">077</span><span id="line-77"> public JVM() {</span> |
| <span class="source-line-no">078</span><span id="line-78"> this.osMbean = ManagementFactory.getOperatingSystemMXBean();</span> |
| <span class="source-line-no">079</span><span id="line-79"> }</span> |
| <span class="source-line-no">080</span><span id="line-80"></span> |
| <span class="source-line-no">081</span><span id="line-81"> /**</span> |
| <span class="source-line-no">082</span><span id="line-82"> * Check if the OS is unix.</span> |
| <span class="source-line-no">083</span><span id="line-83"> * @return whether this is unix or not.</span> |
| <span class="source-line-no">084</span><span id="line-84"> */</span> |
| <span class="source-line-no">085</span><span id="line-85"> public static boolean isUnix() {</span> |
| <span class="source-line-no">086</span><span id="line-86"> if (windows) {</span> |
| <span class="source-line-no">087</span><span id="line-87"> return false;</span> |
| <span class="source-line-no">088</span><span id="line-88"> }</span> |
| <span class="source-line-no">089</span><span id="line-89"> return (ibmvendor ? linux : true);</span> |
| <span class="source-line-no">090</span><span id="line-90"> }</span> |
| <span class="source-line-no">091</span><span id="line-91"></span> |
| <span class="source-line-no">092</span><span id="line-92"> /**</span> |
| <span class="source-line-no">093</span><span id="line-93"> * Check if the OS is linux.</span> |
| <span class="source-line-no">094</span><span id="line-94"> * @return whether this is linux or not.</span> |
| <span class="source-line-no">095</span><span id="line-95"> */</span> |
| <span class="source-line-no">096</span><span id="line-96"> public static boolean isLinux() {</span> |
| <span class="source-line-no">097</span><span id="line-97"> return linux;</span> |
| <span class="source-line-no">098</span><span id="line-98"> }</span> |
| <span class="source-line-no">099</span><span id="line-99"></span> |
| <span class="source-line-no">100</span><span id="line-100"> /**</span> |
| <span class="source-line-no">101</span><span id="line-101"> * Check if the arch is amd64;</span> |
| <span class="source-line-no">102</span><span id="line-102"> * @return whether this is amd64 or not.</span> |
| <span class="source-line-no">103</span><span id="line-103"> */</span> |
| <span class="source-line-no">104</span><span id="line-104"> public static boolean isAmd64() {</span> |
| <span class="source-line-no">105</span><span id="line-105"> return amd64;</span> |
| <span class="source-line-no">106</span><span id="line-106"> }</span> |
| <span class="source-line-no">107</span><span id="line-107"></span> |
| <span class="source-line-no">108</span><span id="line-108"> /**</span> |
| <span class="source-line-no">109</span><span id="line-109"> * Check if the arch is aarch64;</span> |
| <span class="source-line-no">110</span><span id="line-110"> * @return whether this is aarch64 or not.</span> |
| <span class="source-line-no">111</span><span id="line-111"> */</span> |
| <span class="source-line-no">112</span><span id="line-112"> public static boolean isAarch64() {</span> |
| <span class="source-line-no">113</span><span id="line-113"> return aarch64;</span> |
| <span class="source-line-no">114</span><span id="line-114"> }</span> |
| <span class="source-line-no">115</span><span id="line-115"></span> |
| <span class="source-line-no">116</span><span id="line-116"> /**</span> |
| <span class="source-line-no">117</span><span id="line-117"> * Check if the finish() method of GZIPOutputStream is broken</span> |
| <span class="source-line-no">118</span><span id="line-118"> * @return whether GZIPOutputStream.finish() is broken.</span> |
| <span class="source-line-no">119</span><span id="line-119"> */</span> |
| <span class="source-line-no">120</span><span id="line-120"> public static boolean isGZIPOutputStreamFinishBroken() {</span> |
| <span class="source-line-no">121</span><span id="line-121"> return ibmvendor && JVMVersion.contains("1.6.0");</span> |
| <span class="source-line-no">122</span><span id="line-122"> }</span> |
| <span class="source-line-no">123</span><span id="line-123"></span> |
| <span class="source-line-no">124</span><span id="line-124"> public static int getJVMSpecVersion() {</span> |
| <span class="source-line-no">125</span><span id="line-125"> return JVM_SPEC_VERSION;</span> |
| <span class="source-line-no">126</span><span id="line-126"> }</span> |
| <span class="source-line-no">127</span><span id="line-127"></span> |
| <span class="source-line-no">128</span><span id="line-128"> /**</span> |
| <span class="source-line-no">129</span><span id="line-129"> * Load the implementation of UnixOperatingSystemMXBean for Oracle jvm and runs the desired</span> |
| <span class="source-line-no">130</span><span id="line-130"> * method.</span> |
| <span class="source-line-no">131</span><span id="line-131"> * @param mBeanMethodName : method to run from the interface UnixOperatingSystemMXBean</span> |
| <span class="source-line-no">132</span><span id="line-132"> * @return the method result</span> |
| <span class="source-line-no">133</span><span id="line-133"> */</span> |
| <span class="source-line-no">134</span><span id="line-134"> private Long runUnixMXBeanMethod(String mBeanMethodName) {</span> |
| <span class="source-line-no">135</span><span id="line-135"> Object unixos;</span> |
| <span class="source-line-no">136</span><span id="line-136"> Class<?> classRef;</span> |
| <span class="source-line-no">137</span><span id="line-137"> Method mBeanMethod;</span> |
| <span class="source-line-no">138</span><span id="line-138"></span> |
| <span class="source-line-no">139</span><span id="line-139"> try {</span> |
| <span class="source-line-no">140</span><span id="line-140"> classRef = Class.forName("com.sun.management.UnixOperatingSystemMXBean");</span> |
| <span class="source-line-no">141</span><span id="line-141"> if (classRef.isInstance(osMbean)) {</span> |
| <span class="source-line-no">142</span><span id="line-142"> mBeanMethod = classRef.getMethod(mBeanMethodName);</span> |
| <span class="source-line-no">143</span><span id="line-143"> unixos = classRef.cast(osMbean);</span> |
| <span class="source-line-no">144</span><span id="line-144"> return (Long) mBeanMethod.invoke(unixos);</span> |
| <span class="source-line-no">145</span><span id="line-145"> }</span> |
| <span class="source-line-no">146</span><span id="line-146"> } catch (Exception e) {</span> |
| <span class="source-line-no">147</span><span id="line-147"> LOG.warn(</span> |
| <span class="source-line-no">148</span><span id="line-148"> "Not able to load class or method for" + " com.sun.management.UnixOperatingSystemMXBean.",</span> |
| <span class="source-line-no">149</span><span id="line-149"> e);</span> |
| <span class="source-line-no">150</span><span id="line-150"> }</span> |
| <span class="source-line-no">151</span><span id="line-151"> return null;</span> |
| <span class="source-line-no">152</span><span id="line-152"> }</span> |
| <span class="source-line-no">153</span><span id="line-153"></span> |
| <span class="source-line-no">154</span><span id="line-154"> /**</span> |
| <span class="source-line-no">155</span><span id="line-155"> * Get the number of opened filed descriptor for the runtime jvm. If Oracle java, it will use the</span> |
| <span class="source-line-no">156</span><span id="line-156"> * com.sun.management interfaces. Otherwise, this methods implements it (linux only).</span> |
| <span class="source-line-no">157</span><span id="line-157"> * @return number of open file descriptors for the jvm</span> |
| <span class="source-line-no">158</span><span id="line-158"> */</span> |
| <span class="source-line-no">159</span><span id="line-159"> public long getOpenFileDescriptorCount() {</span> |
| <span class="source-line-no">160</span><span id="line-160"> Long ofdc;</span> |
| <span class="source-line-no">161</span><span id="line-161"></span> |
| <span class="source-line-no">162</span><span id="line-162"> if (!ibmvendor) {</span> |
| <span class="source-line-no">163</span><span id="line-163"> ofdc = runUnixMXBeanMethod("getOpenFileDescriptorCount");</span> |
| <span class="source-line-no">164</span><span id="line-164"> return (ofdc != null ? ofdc : -1);</span> |
| <span class="source-line-no">165</span><span id="line-165"> }</span> |
| <span class="source-line-no">166</span><span id="line-166"> InputStream inputStream = null;</span> |
| <span class="source-line-no">167</span><span id="line-167"> InputStreamReader inputStreamReader = null;</span> |
| <span class="source-line-no">168</span><span id="line-168"> BufferedReader bufferedReader = null;</span> |
| <span class="source-line-no">169</span><span id="line-169"> try {</span> |
| <span class="source-line-no">170</span><span id="line-170"> // need to get the PID number of the process first</span> |
| <span class="source-line-no">171</span><span id="line-171"> RuntimeMXBean rtmbean = ManagementFactory.getRuntimeMXBean();</span> |
| <span class="source-line-no">172</span><span id="line-172"> String rtname = rtmbean.getName();</span> |
| <span class="source-line-no">173</span><span id="line-173"> Iterator<String> pidhost = Splitter.on('@').split(rtname).iterator();</span> |
| <span class="source-line-no">174</span><span id="line-174"> // using linux bash commands to retrieve info</span> |
| <span class="source-line-no">175</span><span id="line-175"> Process p = Runtime.getRuntime()</span> |
| <span class="source-line-no">176</span><span id="line-176"> .exec(new String[] { "bash", "-c", "ls /proc/" + pidhost.next() + "/fdinfo | wc -l" });</span> |
| <span class="source-line-no">177</span><span id="line-177"> inputStream = p.getInputStream();</span> |
| <span class="source-line-no">178</span><span id="line-178"> inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);</span> |
| <span class="source-line-no">179</span><span id="line-179"> bufferedReader = new BufferedReader(inputStreamReader);</span> |
| <span class="source-line-no">180</span><span id="line-180"> String openFileDesCount;</span> |
| <span class="source-line-no">181</span><span id="line-181"> if ((openFileDesCount = bufferedReader.readLine()) != null) {</span> |
| <span class="source-line-no">182</span><span id="line-182"> return Long.parseLong(openFileDesCount);</span> |
| <span class="source-line-no">183</span><span id="line-183"> }</span> |
| <span class="source-line-no">184</span><span id="line-184"> } catch (IOException ie) {</span> |
| <span class="source-line-no">185</span><span id="line-185"> LOG.warn("Not able to get the number of open file descriptors", ie);</span> |
| <span class="source-line-no">186</span><span id="line-186"> } finally {</span> |
| <span class="source-line-no">187</span><span id="line-187"> if (bufferedReader != null) {</span> |
| <span class="source-line-no">188</span><span id="line-188"> try {</span> |
| <span class="source-line-no">189</span><span id="line-189"> bufferedReader.close();</span> |
| <span class="source-line-no">190</span><span id="line-190"> } catch (IOException e) {</span> |
| <span class="source-line-no">191</span><span id="line-191"> LOG.warn("Not able to close the BufferedReader", e);</span> |
| <span class="source-line-no">192</span><span id="line-192"> }</span> |
| <span class="source-line-no">193</span><span id="line-193"> }</span> |
| <span class="source-line-no">194</span><span id="line-194"> if (inputStreamReader != null) {</span> |
| <span class="source-line-no">195</span><span id="line-195"> try {</span> |
| <span class="source-line-no">196</span><span id="line-196"> inputStreamReader.close();</span> |
| <span class="source-line-no">197</span><span id="line-197"> } catch (IOException e) {</span> |
| <span class="source-line-no">198</span><span id="line-198"> LOG.warn("Not able to close the InputStreamReader", e);</span> |
| <span class="source-line-no">199</span><span id="line-199"> }</span> |
| <span class="source-line-no">200</span><span id="line-200"> }</span> |
| <span class="source-line-no">201</span><span id="line-201"> if (inputStream != null) {</span> |
| <span class="source-line-no">202</span><span id="line-202"> try {</span> |
| <span class="source-line-no">203</span><span id="line-203"> inputStream.close();</span> |
| <span class="source-line-no">204</span><span id="line-204"> } catch (IOException e) {</span> |
| <span class="source-line-no">205</span><span id="line-205"> LOG.warn("Not able to close the InputStream", e);</span> |
| <span class="source-line-no">206</span><span id="line-206"> }</span> |
| <span class="source-line-no">207</span><span id="line-207"> }</span> |
| <span class="source-line-no">208</span><span id="line-208"> }</span> |
| <span class="source-line-no">209</span><span id="line-209"> return -1;</span> |
| <span class="source-line-no">210</span><span id="line-210"> }</span> |
| <span class="source-line-no">211</span><span id="line-211"></span> |
| <span class="source-line-no">212</span><span id="line-212"> /**</span> |
| <span class="source-line-no">213</span><span id="line-213"> * Get the system load average</span> |
| <span class="source-line-no">214</span><span id="line-214"> * @see java.lang.management.OperatingSystemMXBean#getSystemLoadAverage</span> |
| <span class="source-line-no">215</span><span id="line-215"> */</span> |
| <span class="source-line-no">216</span><span id="line-216"> public double getSystemLoadAverage() {</span> |
| <span class="source-line-no">217</span><span id="line-217"> return osMbean.getSystemLoadAverage();</span> |
| <span class="source-line-no">218</span><span id="line-218"> }</span> |
| <span class="source-line-no">219</span><span id="line-219"></span> |
| <span class="source-line-no">220</span><span id="line-220"> /**</span> |
| <span class="source-line-no">221</span><span id="line-221"> * Return the physical free memory (not the JVM one, as it's not very useful as it depends on the</span> |
| <span class="source-line-no">222</span><span id="line-222"> * GC), but the one from the OS as it allows a little bit more to guess if the machine is</span> |
| <span class="source-line-no">223</span><span id="line-223"> * overloaded or not).</span> |
| <span class="source-line-no">224</span><span id="line-224"> */</span> |
| <span class="source-line-no">225</span><span id="line-225"> public long getFreeMemory() {</span> |
| <span class="source-line-no">226</span><span id="line-226"> if (ibmvendor) {</span> |
| <span class="source-line-no">227</span><span id="line-227"> return 0;</span> |
| <span class="source-line-no">228</span><span id="line-228"> }</span> |
| <span class="source-line-no">229</span><span id="line-229"></span> |
| <span class="source-line-no">230</span><span id="line-230"> Long r = runUnixMXBeanMethod("getFreePhysicalMemorySize");</span> |
| <span class="source-line-no">231</span><span id="line-231"> return (r != null ? r : -1);</span> |
| <span class="source-line-no">232</span><span id="line-232"> }</span> |
| <span class="source-line-no">233</span><span id="line-233"></span> |
| <span class="source-line-no">234</span><span id="line-234"> /**</span> |
| <span class="source-line-no">235</span><span id="line-235"> * Workaround to get the current number of process running. Approach is the one described here:</span> |
| <span class="source-line-no">236</span><span id="line-236"> * http://stackoverflow.com/questions/54686/how-to-get-a-list-of-current-open-windows-process-with-java</span> |
| <span class="source-line-no">237</span><span id="line-237"> */</span> |
| <span class="source-line-no">238</span><span id="line-238"> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "RV_DONT_JUST_NULL_CHECK_READLINE",</span> |
| <span class="source-line-no">239</span><span id="line-239"> justification = "used by testing")</span> |
| <span class="source-line-no">240</span><span id="line-240"> public int getNumberOfRunningProcess() {</span> |
| <span class="source-line-no">241</span><span id="line-241"> if (!isUnix()) {</span> |
| <span class="source-line-no">242</span><span id="line-242"> return 0;</span> |
| <span class="source-line-no">243</span><span id="line-243"> }</span> |
| <span class="source-line-no">244</span><span id="line-244"></span> |
| <span class="source-line-no">245</span><span id="line-245"> InputStream inputStream = null;</span> |
| <span class="source-line-no">246</span><span id="line-246"> InputStreamReader inputStreamReader = null;</span> |
| <span class="source-line-no">247</span><span id="line-247"> BufferedReader bufferedReader = null;</span> |
| <span class="source-line-no">248</span><span id="line-248"></span> |
| <span class="source-line-no">249</span><span id="line-249"> try {</span> |
| <span class="source-line-no">250</span><span id="line-250"> int count = 0;</span> |
| <span class="source-line-no">251</span><span id="line-251"> Process p = Runtime.getRuntime().exec("ps -e");</span> |
| <span class="source-line-no">252</span><span id="line-252"> inputStream = p.getInputStream();</span> |
| <span class="source-line-no">253</span><span id="line-253"> inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);</span> |
| <span class="source-line-no">254</span><span id="line-254"> bufferedReader = new BufferedReader(inputStreamReader);</span> |
| <span class="source-line-no">255</span><span id="line-255"> while (bufferedReader.readLine() != null) {</span> |
| <span class="source-line-no">256</span><span id="line-256"> count++;</span> |
| <span class="source-line-no">257</span><span id="line-257"> }</span> |
| <span class="source-line-no">258</span><span id="line-258"> return count - 1; // -1 because there is a headline</span> |
| <span class="source-line-no">259</span><span id="line-259"> } catch (IOException e) {</span> |
| <span class="source-line-no">260</span><span id="line-260"> return -1;</span> |
| <span class="source-line-no">261</span><span id="line-261"> } finally {</span> |
| <span class="source-line-no">262</span><span id="line-262"> if (bufferedReader != null) {</span> |
| <span class="source-line-no">263</span><span id="line-263"> try {</span> |
| <span class="source-line-no">264</span><span id="line-264"> bufferedReader.close();</span> |
| <span class="source-line-no">265</span><span id="line-265"> } catch (IOException e) {</span> |
| <span class="source-line-no">266</span><span id="line-266"> LOG.warn("Not able to close the BufferedReader", e);</span> |
| <span class="source-line-no">267</span><span id="line-267"> }</span> |
| <span class="source-line-no">268</span><span id="line-268"> }</span> |
| <span class="source-line-no">269</span><span id="line-269"> if (inputStreamReader != null) {</span> |
| <span class="source-line-no">270</span><span id="line-270"> try {</span> |
| <span class="source-line-no">271</span><span id="line-271"> inputStreamReader.close();</span> |
| <span class="source-line-no">272</span><span id="line-272"> } catch (IOException e) {</span> |
| <span class="source-line-no">273</span><span id="line-273"> LOG.warn("Not able to close the InputStreamReader", e);</span> |
| <span class="source-line-no">274</span><span id="line-274"> }</span> |
| <span class="source-line-no">275</span><span id="line-275"> }</span> |
| <span class="source-line-no">276</span><span id="line-276"> if (inputStream != null) {</span> |
| <span class="source-line-no">277</span><span id="line-277"> try {</span> |
| <span class="source-line-no">278</span><span id="line-278"> inputStream.close();</span> |
| <span class="source-line-no">279</span><span id="line-279"> } catch (IOException e) {</span> |
| <span class="source-line-no">280</span><span id="line-280"> LOG.warn("Not able to close the InputStream", e);</span> |
| <span class="source-line-no">281</span><span id="line-281"> }</span> |
| <span class="source-line-no">282</span><span id="line-282"> }</span> |
| <span class="source-line-no">283</span><span id="line-283"> }</span> |
| <span class="source-line-no">284</span><span id="line-284"> }</span> |
| <span class="source-line-no">285</span><span id="line-285"></span> |
| <span class="source-line-no">286</span><span id="line-286"> /**</span> |
| <span class="source-line-no">287</span><span id="line-287"> * Get the number of the maximum file descriptors the system can use. If Oracle java, it will use</span> |
| <span class="source-line-no">288</span><span id="line-288"> * the com.sun.management interfaces. Otherwise, this methods implements it (linux only).</span> |
| <span class="source-line-no">289</span><span id="line-289"> * @return max number of file descriptors the operating system can use.</span> |
| <span class="source-line-no">290</span><span id="line-290"> */</span> |
| <span class="source-line-no">291</span><span id="line-291"> public long getMaxFileDescriptorCount() {</span> |
| <span class="source-line-no">292</span><span id="line-292"> Long mfdc;</span> |
| <span class="source-line-no">293</span><span id="line-293"> if (!ibmvendor) {</span> |
| <span class="source-line-no">294</span><span id="line-294"> mfdc = runUnixMXBeanMethod("getMaxFileDescriptorCount");</span> |
| <span class="source-line-no">295</span><span id="line-295"> return (mfdc != null ? mfdc : -1);</span> |
| <span class="source-line-no">296</span><span id="line-296"> }</span> |
| <span class="source-line-no">297</span><span id="line-297"> InputStream in = null;</span> |
| <span class="source-line-no">298</span><span id="line-298"> BufferedReader output = null;</span> |
| <span class="source-line-no">299</span><span id="line-299"> try {</span> |
| <span class="source-line-no">300</span><span id="line-300"> // using linux bash commands to retrieve info</span> |
| <span class="source-line-no">301</span><span id="line-301"> Process p = Runtime.getRuntime().exec(new String[] { "bash", "-c", "ulimit -n" });</span> |
| <span class="source-line-no">302</span><span id="line-302"> in = p.getInputStream();</span> |
| <span class="source-line-no">303</span><span id="line-303"> output = new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8));</span> |
| <span class="source-line-no">304</span><span id="line-304"> String maxFileDesCount;</span> |
| <span class="source-line-no">305</span><span id="line-305"> if ((maxFileDesCount = output.readLine()) != null) {</span> |
| <span class="source-line-no">306</span><span id="line-306"> return Long.parseLong(maxFileDesCount);</span> |
| <span class="source-line-no">307</span><span id="line-307"> }</span> |
| <span class="source-line-no">308</span><span id="line-308"> } catch (IOException ie) {</span> |
| <span class="source-line-no">309</span><span id="line-309"> LOG.warn("Not able to get the max number of file descriptors", ie);</span> |
| <span class="source-line-no">310</span><span id="line-310"> } finally {</span> |
| <span class="source-line-no">311</span><span id="line-311"> if (output != null) {</span> |
| <span class="source-line-no">312</span><span id="line-312"> try {</span> |
| <span class="source-line-no">313</span><span id="line-313"> output.close();</span> |
| <span class="source-line-no">314</span><span id="line-314"> } catch (IOException e) {</span> |
| <span class="source-line-no">315</span><span id="line-315"> LOG.warn("Not able to close the reader", e);</span> |
| <span class="source-line-no">316</span><span id="line-316"> }</span> |
| <span class="source-line-no">317</span><span id="line-317"> }</span> |
| <span class="source-line-no">318</span><span id="line-318"> if (in != null) {</span> |
| <span class="source-line-no">319</span><span id="line-319"> try {</span> |
| <span class="source-line-no">320</span><span id="line-320"> in.close();</span> |
| <span class="source-line-no">321</span><span id="line-321"> } catch (IOException e) {</span> |
| <span class="source-line-no">322</span><span id="line-322"> LOG.warn("Not able to close the InputStream", e);</span> |
| <span class="source-line-no">323</span><span id="line-323"> }</span> |
| <span class="source-line-no">324</span><span id="line-324"> }</span> |
| <span class="source-line-no">325</span><span id="line-325"> }</span> |
| <span class="source-line-no">326</span><span id="line-326"> return -1;</span> |
| <span class="source-line-no">327</span><span id="line-327"> }</span> |
| <span class="source-line-no">328</span><span id="line-328">}</span> |
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| </pre> |
| </div> |
| </main> |
| </body> |
| </html> |
