/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.api;
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import org.opends.server.config.ConfigEntry;
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import org.opends.server.config.ConfigException;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.InitializationException;
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import org.opends.server.types.Operation;
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/**
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* This class defines the structure and methods that must be
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* implemented by a Directory Server work queue. The work queue is
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* the component of the server that accepts requests from connection
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* handlers and ensures that they are properly processed. The manner
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* in which the work queue is able to accomplish this may vary between
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* implementations, but in general it is assumed that one or more
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* worker threads will be associated with the queue and may be used to
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* process requests in parallel.
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*/
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public abstract class WorkQueue
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{
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/**
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* Initializes this work queue based on the information in the
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* provided configuration entry.
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*
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* @param configEntry The configuration entry that contains the
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* information to use to initialize this work
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* queue.
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*
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* @throws ConfigException If the provided configuration entry
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* does not have a valid work queue
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* configuration.
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*
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* @throws InitializationException If a problem occurs during
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* initialization that is not
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* related to the server
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* configuration.
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*/
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public abstract void initializeWorkQueue(ConfigEntry configEntry)
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throws ConfigException, InitializationException;
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/**
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* Performs any necessary finalization for this work queue,
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* including ensuring that all active operations are interrupted or
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* will be allowed to complete, and that all pending operations will
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* be cancelled.
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*
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* @param reason The human-readable reason that the work queue is
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* being shut down.
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*/
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public abstract void finalizeWorkQueue(String reason);
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/**
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* Submits an operation to be processed in the server.
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*
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* @param operation The operation to be processed.
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*
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* @throws DirectoryException If the provided operation is not
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* accepted for some reason (e.g., if
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* the server is shutting down or
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* already has too many pending
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* requests in the queue).
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*/
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public abstract void submitOperation(Operation operation)
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throws DirectoryException;
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/**
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* Indicates whether the work queue is currently processing any
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* requests. Note that this is a point-in-time determination, and
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* if any component of the server wishes to depend on a quiescent
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* state then it should use some external mechanism to ensure that
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* no other requests are submitted to the queue.
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*
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* @return {@code true} if the work queue is currently idle, or
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* {@code false} if it is being used to process one or more
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* operations.
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*/
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public abstract boolean isIdle();
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/**
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* Waits for the work queue to become idle before returning. Note
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* that this is a point-in-time determination, and if any component
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* of the server wishes to depend on a quiescent state then it
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* should use some external mechanism to ensure that no other
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* requests are submitted to the queue.
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*
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* @param timeLimit The maximum length of time in milliseconds
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* that this method should wait for the queue to
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* become idle before giving up. A time limit
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* that is less than or equal to zero indicates
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* that there should not be a time limit.
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*
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* @return {@code true} if the work queue is idle at the time that
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* this method returns, or {@code false} if the wait time
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* limit was reached before the server became idle.
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*/
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public boolean waitUntilIdle(long timeLimit)
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{
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long stopWaitingTime;
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if (timeLimit <= 0)
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{
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stopWaitingTime = Long.MAX_VALUE;
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}
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else
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{
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stopWaitingTime = System.currentTimeMillis() + timeLimit;
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}
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while (System.currentTimeMillis() < stopWaitingTime)
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{
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if (isIdle())
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{
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return true;
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}
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try
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{
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Thread.sleep(1);
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} catch (InterruptedException ie) {}
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}
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return false;
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}
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}
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