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190 lines
9.7 KiB
190 lines
9.7 KiB
// serverInstantThread.java
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// -----------------------
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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// last major change: 14.03.2005
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.server;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.TreeMap;
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import de.anomic.server.logging.serverLog;
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public final class serverInstantBusyThread extends serverAbstractBusyThread implements serverBusyThread {
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private Method jobExecMethod, jobCountMethod, freememExecMethod;
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private Object environment;
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private Long handle;
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public static int instantThreadCounter = 0;
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public static TreeMap<Long, String> jobs = new TreeMap<Long, String>();
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public serverInstantBusyThread(Object env, String jobExec, String jobCount, String freemem) {
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// jobExec is the name of a method of the object 'env' that executes the one-step-run
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// jobCount is the name of a method that returns the size of the job
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// freemem is the name of a method that tries to free memory and returns void
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Class<?> theClass = (env instanceof Class) ? (Class<?>) env : env.getClass();
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try {
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this.jobExecMethod = theClass.getMethod(jobExec, new Class[0]);
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} catch (NoSuchMethodException e) {
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throw new RuntimeException("serverInstantThread, wrong declaration of jobExec: " + e.getMessage());
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}
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try {
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if (jobCount == null)
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this.jobCountMethod = null;
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else
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this.jobCountMethod = theClass.getMethod(jobCount, new Class[0]);
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} catch (NoSuchMethodException e) {
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throw new RuntimeException("serverInstantThread, wrong declaration of jobCount: " + e.getMessage());
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}
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try {
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if (freemem == null)
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this.freememExecMethod = null;
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else
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this.freememExecMethod = theClass.getMethod(freemem, new Class[0]);
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} catch (NoSuchMethodException e) {
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throw new RuntimeException("serverInstantThread, wrong declaration of freemem: " + e.getMessage());
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}
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this.environment = (env instanceof Class) ? null : env;
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this.setName(theClass.getName() + "." + jobExec);
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this.handle = new Long(System.currentTimeMillis() + this.getName().hashCode());
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}
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public int getJobCount() {
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if (this.jobCountMethod == null) return Integer.MAX_VALUE;
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try {
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Object result = jobCountMethod.invoke(environment, new Object[0]);
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if (result instanceof Integer)
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return ((Integer) result).intValue();
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else
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return -1;
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} catch (IllegalAccessException e) {
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return -1;
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} catch (IllegalArgumentException e) {
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return -1;
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} catch (InvocationTargetException e) {
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serverLog.logSevere("BUSYTHREAD", "invocation serverInstantThread of thread '" + this.getName() + "': " + e.getMessage(), e);
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return -1;
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}
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}
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public boolean job() throws Exception {
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instantThreadCounter++;
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//System.out.println("started job " + this.handle + ": " + this.getName());
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synchronized(jobs) {jobs.put(this.handle, this.getName());}
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boolean jobHasDoneSomething = false;
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try {
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Object result = jobExecMethod.invoke(environment, new Object[0]);
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if (result == null) jobHasDoneSomething = true;
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else if (result instanceof Boolean) jobHasDoneSomething = ((Boolean) result).booleanValue();
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} catch (IllegalAccessException e) {
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serverLog.logSevere("BUSYTHREAD", "Internal Error in serverInstantThread.job: " + e.getMessage());
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serverLog.logSevere("BUSYTHREAD", "shutting down thread '" + this.getName() + "'");
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this.terminate(false);
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} catch (IllegalArgumentException e) {
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serverLog.logSevere("BUSYTHREAD", "Internal Error in serverInstantThread.job: " + e.getMessage());
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serverLog.logSevere("BUSYTHREAD", "shutting down thread '" + this.getName() + "'");
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this.terminate(false);
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} catch (InvocationTargetException e) {
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String targetException = e.getTargetException().getMessage();
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e.getTargetException().printStackTrace();
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e.printStackTrace();
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if ((targetException != null) && ((targetException.indexOf("heap space") > 0) || (targetException.indexOf("NullPointerException") > 0))) e.getTargetException().printStackTrace();
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serverLog.logSevere("BUSYTHREAD", "Runtime Error in serverInstantThread.job, thread '" + this.getName() + "': " + e.getMessage() + "; target exception: " + targetException, e.getTargetException());
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e.getTargetException().printStackTrace();
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} catch (OutOfMemoryError e) {
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serverLog.logSevere("BUSYTHREAD", "OutOfMemory Error in serverInstantThread.job, thread '" + this.getName() + "': " + e.getMessage());
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e.printStackTrace();
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freemem();
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}
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instantThreadCounter--;
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synchronized(jobs) {jobs.remove(this.handle);}
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return jobHasDoneSomething;
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}
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public void freemem() {
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if (freememExecMethod == null) return;
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try {
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freememExecMethod.invoke(environment, new Object[0]);
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} catch (IllegalAccessException e) {
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serverLog.logSevere("BUSYTHREAD", "Internal Error in serverInstantThread.freemem: " + e.getMessage());
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serverLog.logSevere("BUSYTHREAD", "shutting down thread '" + this.getName() + "'");
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this.terminate(false);
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} catch (IllegalArgumentException e) {
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serverLog.logSevere("BUSYTHREAD", "Internal Error in serverInstantThread.freemem: " + e.getMessage());
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serverLog.logSevere("BUSYTHREAD", "shutting down thread '" + this.getName() + "'");
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this.terminate(false);
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} catch (InvocationTargetException e) {
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String targetException = e.getTargetException().getMessage();
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if (targetException.indexOf("heap space") > 0) e.getTargetException().printStackTrace();
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serverLog.logSevere("BUSYTHREAD", "Runtime Error in serverInstantThread.freemem, thread '" + this.getName() + "': " + e.getMessage() + "; target exception: " + targetException, e.getTargetException());
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e.getTargetException().printStackTrace();
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} catch (OutOfMemoryError e) {
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serverLog.logSevere("BUSYTHREAD", "OutOfMemory Error in serverInstantThread.freemem, thread '" + this.getName() + "': " + e.getMessage());
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e.printStackTrace();
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}
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}
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public static serverBusyThread oneTimeJob(Object env, String jobExec, serverLog log, long startupDelay) {
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// start the job and execute it once as background process
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serverBusyThread thread = new serverInstantBusyThread(env, jobExec, null, null);
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thread.setStartupSleep(startupDelay);
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thread.setIdleSleep(-1);
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thread.setBusySleep(-1);
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thread.setMemPreReqisite(0);
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thread.setLog(log);
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thread.start();
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return thread;
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}
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public static serverThread oneTimeJob(Runnable thread, long startupDelay) {
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serverLog log = new serverLog(thread.getClass().getName() + "/run");
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log.setLevel(java.util.logging.Level.INFO);
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return oneTimeJob(thread, "run", log, startupDelay);
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}
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public static serverThread oneTimeJob(Runnable thread, long startupDelay, int maxJobs) {
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while (instantThreadCounter >= maxJobs) try {Thread.sleep(100);} catch (InterruptedException e) {break;}
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return oneTimeJob( thread, startupDelay);
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}
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}
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