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185 lines
8.6 KiB
185 lines
8.6 KiB
// InstantBusyThread.java
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// -----------------------
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// (C) by Michael Peter Christen; mc@yacy.net
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2005
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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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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package net.yacy.kelondro.workflow;
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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 net.yacy.cora.util.ConcurrentLog;
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public final class InstantBusyThread extends AbstractBusyThread implements BusyThread {
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private Method jobExecMethod, jobCountMethod, freememExecMethod;
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private final Object environment;
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private final Long handle;
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private static final TreeMap<Long, String> jobs = new TreeMap<Long, String>();
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public InstantBusyThread(
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final Object env,
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final String jobExec,
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final String jobCount,
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final String freemem,
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final long idleSleep,
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final long busySleep) {
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super(idleSleep, busySleep);
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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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final Class<?> theClass = (env instanceof Class<?>) ? (Class<?>) env : env.getClass();
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try {
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this.jobExecMethod = theClass.getMethod(jobExec);
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} catch (final 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);
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} catch (final 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);
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} catch (final 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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setName("BusyThread " + theClass.getName() + "." + jobExec);
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this.handle = Long.valueOf(System.currentTimeMillis() + getName().hashCode());
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}
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@Override
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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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final Object result = this.jobCountMethod.invoke(this.environment);
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return (result instanceof Integer) ? ((Integer) result).intValue() : -1;
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} catch (final IllegalAccessException e) {
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return -1;
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} catch (final IllegalArgumentException e) {
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return -1;
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} catch (final InvocationTargetException e) {
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ConcurrentLog.severe("BUSYTHREAD", "invocation serverInstantThread of thread '" + getName() + "': " + e.getMessage(), e);
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return -1;
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}
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}
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@Override
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public boolean job() throws Exception {
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//System.out.println("started job " + this.handle + ": " + this.getName());
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synchronized(jobs) {jobs.put(this.handle, getName());}
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boolean jobHasDoneSomething = false;
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try {
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final Object result = this.jobExecMethod.invoke(this.environment);
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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 (final IllegalAccessException e) {
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ConcurrentLog.severe("BUSYTHREAD", "Internal Error in serverInstantThread.job: " + e.getMessage());
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ConcurrentLog.severe("BUSYTHREAD", "shutting down thread '" + getName() + "'");
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terminate(false);
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} catch (final IllegalArgumentException e) {
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ConcurrentLog.severe("BUSYTHREAD", "Internal Error in serverInstantThread.job: " + e.getMessage());
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ConcurrentLog.severe("BUSYTHREAD", "shutting down thread '" + getName() + "'");
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terminate(false);
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} catch (final InvocationTargetException e) {
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final String targetException = e.getTargetException().getMessage();
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ConcurrentLog.logException(e);
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ConcurrentLog.logException(e.getCause());
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ConcurrentLog.logException(e.getTargetException());
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ConcurrentLog.severe("BUSYTHREAD", "Runtime Error in serverInstantThread.job, thread '" + getName() + "': " + e.getMessage() + "; target exception: " + targetException, e.getTargetException());
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} catch (final OutOfMemoryError e) {
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ConcurrentLog.severe("BUSYTHREAD", "OutOfMemory Error in serverInstantThread.job, thread '" + getName() + "': " + e.getMessage());
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ConcurrentLog.logException(e);
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freemem();
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} catch (final Exception e) {
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ConcurrentLog.severe("BUSYTHREAD", "Generic Exception, thread '" + getName() + "': " + e.getMessage());
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ConcurrentLog.logException(e);
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}
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synchronized(jobs) {jobs.remove(this.handle);}
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return jobHasDoneSomething;
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}
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@Override
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public void freemem() {
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if (this.freememExecMethod == null) return;
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try {
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this.freememExecMethod.invoke(this.environment);
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} catch (final IllegalAccessException e) {
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ConcurrentLog.severe("BUSYTHREAD", "Internal Error in serverInstantThread.freemem: " + e.getMessage());
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ConcurrentLog.severe("BUSYTHREAD", "shutting down thread '" + getName() + "'");
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terminate(false);
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} catch (final IllegalArgumentException e) {
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ConcurrentLog.severe("BUSYTHREAD", "Internal Error in serverInstantThread.freemem: " + e.getMessage());
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ConcurrentLog.severe("BUSYTHREAD", "shutting down thread '" + getName() + "'");
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terminate(false);
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} catch (final InvocationTargetException e) {
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final String targetException = e.getTargetException().getMessage();
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if (targetException.indexOf("heap space",0) > 0) ConcurrentLog.logException(e.getTargetException());
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ConcurrentLog.severe("BUSYTHREAD", "Runtime Error in serverInstantThread.freemem, thread '" + getName() + "': " + e.getMessage() + "; target exception: " + targetException, e.getTargetException());
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ConcurrentLog.logException(e.getTargetException());
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} catch (final OutOfMemoryError e) {
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ConcurrentLog.severe("BUSYTHREAD", "OutOfMemory Error in serverInstantThread.freemem, thread '" + getName() + "': " + e.getMessage());
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ConcurrentLog.logException(e);
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}
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}
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public static BusyThread oneTimeJob(final Object env, final String jobExec, final long startupDelay) {
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// start the job and execute it once as background process
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final BusyThread thread = new InstantBusyThread(env, jobExec, null, null, Long.MIN_VALUE, Long.MIN_VALUE);
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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.setLoadPreReqisite(99); // this is called during initialization phase and some code parts depend on it; therefore we cannot set a prerequisite that prevents the start of that thread
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thread.start();
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return thread;
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}
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public static WorkflowThread oneTimeJob(final Runnable thread, final long startupDelay) {
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return oneTimeJob(thread, "run", startupDelay);
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}
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@Override
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public void open() {
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// Not implemented in this thread
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}
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@Override
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public synchronized void close() {
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// Not implemented in this thread
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}
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}
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