mirror of
https://github.com/vanitasvitae/Smack.git
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288 lines
9.4 KiB
Java
288 lines
9.4 KiB
Java
/**
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*
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* Copyright © 2014-2015 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smack;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.locks.Condition;
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import java.util.concurrent.locks.Lock;
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import org.jivesoftware.smack.SmackException.NoResponseException;
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import org.jivesoftware.smack.SmackException.NotConnectedException;
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import org.jivesoftware.smack.packet.TopLevelStreamElement;
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import org.jivesoftware.smack.packet.Stanza;
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import org.jivesoftware.smack.packet.Nonza;
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public class SynchronizationPoint<E extends Exception> {
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private final AbstractXMPPConnection connection;
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private final Lock connectionLock;
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private final Condition condition;
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private final String waitFor;
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// Note that there is no need to make 'state' and 'failureException' volatile. Since 'lock' and 'unlock' have the
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// same memory synchronization effects as synchronization block enter and leave.
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private State state;
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private E failureException;
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/**
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* Construct a new synchronization point for the given connection.
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*
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* @param connection the connection of this synchronization point.
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* @param waitFor a description of the event this synchronization point handles.
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*/
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public SynchronizationPoint(AbstractXMPPConnection connection, String waitFor) {
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this.connection = connection;
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this.connectionLock = connection.getConnectionLock();
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this.condition = connection.getConnectionLock().newCondition();
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this.waitFor = waitFor;
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init();
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}
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/**
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* Initialize (or reset) this synchronization point.
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*/
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public void init() {
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connectionLock.lock();
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state = State.Initial;
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failureException = null;
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connectionLock.unlock();
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}
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/**
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* Send the given top level stream element and wait for a response.
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*
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* @param request the plain stream element to send.
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* @throws NoResponseException if no response was received.
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* @throws NotConnectedException if the connection is not connected.
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* @return <code>null</code> if synchronization point was successful, or the failure Exception.
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*/
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public E sendAndWaitForResponse(TopLevelStreamElement request) throws NoResponseException,
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NotConnectedException, InterruptedException {
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assert (state == State.Initial);
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connectionLock.lock();
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try {
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if (request != null) {
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if (request instanceof Stanza) {
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connection.sendStanza((Stanza) request);
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}
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else if (request instanceof Nonza){
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connection.sendNonza((Nonza) request);
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} else {
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throw new IllegalStateException("Unsupported element type");
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}
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state = State.RequestSent;
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}
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waitForConditionOrTimeout();
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}
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finally {
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connectionLock.unlock();
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}
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return checkForResponse();
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}
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/**
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* Send the given plain stream element and wait for a response.
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*
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* @param request the plain stream element to send.
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* @throws E if an failure was reported.
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* @throws NoResponseException if no response was received.
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* @throws NotConnectedException if the connection is not connected.
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*/
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public void sendAndWaitForResponseOrThrow(Nonza request) throws E, NoResponseException,
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NotConnectedException, InterruptedException {
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sendAndWaitForResponse(request);
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switch (state) {
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case Failure:
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if (failureException != null) {
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throw failureException;
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}
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break;
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default:
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// Success, do nothing
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}
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}
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/**
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* Check if this synchronization point is successful or wait the connections reply timeout.
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* @throws NoResponseException if there was no response marking the synchronization point as success or failed.
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* @throws E if there was a failure
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* @throws InterruptedException
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*/
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public void checkIfSuccessOrWaitOrThrow() throws NoResponseException, E, InterruptedException {
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checkIfSuccessOrWait();
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if (state == State.Failure) {
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throw failureException;
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}
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}
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/**
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* Check if this synchronization point is successful or wait the connections reply timeout.
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* @throws NoResponseException if there was no response marking the synchronization point as success or failed.
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* @throws InterruptedException
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* @return <code>null</code> if synchronization point was successful, or the failure Exception.
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*/
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public E checkIfSuccessOrWait() throws NoResponseException, InterruptedException {
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connectionLock.lock();
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try {
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switch (state) {
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// Return immediately on success or failure
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case Success:
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return null;
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case Failure:
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return failureException;
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default:
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// Do nothing
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break;
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}
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waitForConditionOrTimeout();
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} finally {
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connectionLock.unlock();
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}
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return checkForResponse();
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}
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/**
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* Report this synchronization point as successful.
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*/
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public void reportSuccess() {
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connectionLock.lock();
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try {
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state = State.Success;
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condition.signalAll();
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}
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finally {
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connectionLock.unlock();
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}
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}
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/**
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* Deprecated.
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* @deprecated use {@link #reportFailure(Exception)} instead.
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*/
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@Deprecated
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public void reportFailure() {
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reportFailure(null);
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}
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/**
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* Report this synchronization point as failed because of the given exception. The {@code failureException} must be set.
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*
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* @param failureException the exception causing this synchronization point to fail.
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*/
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public void reportFailure(E failureException) {
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assert failureException != null;
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connectionLock.lock();
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try {
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state = State.Failure;
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this.failureException = failureException;
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condition.signalAll();
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}
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finally {
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connectionLock.unlock();
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}
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}
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/**
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* Check if this synchronization point was successful.
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*
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* @return true if the synchronization point was successful, false otherwise.
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*/
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public boolean wasSuccessful() {
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connectionLock.lock();
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try {
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return state == State.Success;
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}
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finally {
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connectionLock.unlock();
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}
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}
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/**
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* Check if this synchronization point has its request already sent.
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*
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* @return true if the request was already sent, false otherwise.
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*/
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public boolean requestSent() {
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connectionLock.lock();
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try {
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return state == State.RequestSent;
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}
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finally {
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connectionLock.unlock();
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}
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}
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public E getFailureException() {
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connectionLock.lock();
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try {
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return failureException;
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}
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finally {
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connectionLock.unlock();
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}
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}
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/**
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* Wait for the condition to become something else as {@link State#RequestSent} or {@link State#Initial}.
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* {@link #reportSuccess()}, {@link #reportFailure()} and {@link #reportFailure(Exception)} will either set this
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* synchronization point to {@link State#Success} or {@link State#Failure}. If none of them is set after the
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* connections reply timeout, this method will set the state of {@link State#NoResponse}.
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* @throws InterruptedException
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*/
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private void waitForConditionOrTimeout() throws InterruptedException {
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long remainingWait = TimeUnit.MILLISECONDS.toNanos(connection.getReplyTimeout());
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while (state == State.RequestSent || state == State.Initial) {
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if (remainingWait <= 0) {
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state = State.NoResponse;
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break;
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}
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remainingWait = condition.awaitNanos(remainingWait);
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}
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}
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/**
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* Check for a response and throw a {@link NoResponseException} if there was none.
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* <p>
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* The exception is thrown, if state is one of 'Initial', 'NoResponse' or 'RequestSent'
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* </p>
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* @return <code>true</code> if synchronization point was successful, <code>false</code> on failure.
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* @throws NoResponseException
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*/
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private E checkForResponse() throws NoResponseException {
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switch (state) {
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case Initial:
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case NoResponse:
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case RequestSent:
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throw NoResponseException.newWith(connection, waitFor);
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case Success:
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return null;
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case Failure:
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return failureException;
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default:
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throw new AssertionError("Unknown state " + state);
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}
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}
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private enum State {
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Initial,
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RequestSent,
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NoResponse,
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Success,
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Failure,
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}
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}
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