mirror of https://github.com/apache/jclouds.git
Issue 9: better javadoc
git-svn-id: http://jclouds.googlecode.com/svn/trunk@883 3d8758e0-26b5-11de-8745-db77d3ebf521
This commit is contained in:
adrian.f.cole
parent
fd3c3841ee
commit
d9ff753ac4
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@ -40,103 +40,115 @@ import com.google.inject.Inject;
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*
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* @author Adrian Cole
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*/
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public class FutureCommandConnectionPoolClient<C, O extends FutureCommand<?, ?, ?>>
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extends BaseLifeCycle implements FutureCommandClient<O> {
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private final FutureCommandConnectionPool<C, O> futureCommandConnectionPool;
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private final BlockingQueue<O> commandQueue;
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public class FutureCommandConnectionPoolClient<C, O extends FutureCommand<?, ?, ?>> extends
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BaseLifeCycle implements FutureCommandClient<O> {
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private final FutureCommandConnectionPool<C, O> futureCommandConnectionPool;
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private final BlockingQueue<O> commandQueue;
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@Inject
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public FutureCommandConnectionPoolClient(ExecutorService executor,
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FutureCommandConnectionPool<C, O> futureCommandConnectionPool,
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BlockingQueue<O> commandQueue) {
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super(executor, futureCommandConnectionPool);
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this.futureCommandConnectionPool = futureCommandConnectionPool;
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this.commandQueue = commandQueue;
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}
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@Inject
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public FutureCommandConnectionPoolClient(ExecutorService executor,
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FutureCommandConnectionPool<C, O> futureCommandConnectionPool,
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BlockingQueue<O> commandQueue) {
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super(executor, futureCommandConnectionPool);
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this.futureCommandConnectionPool = futureCommandConnectionPool;
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this.commandQueue = commandQueue;
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}
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@Override
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protected boolean shouldDoWork() {
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return super.shouldDoWork()
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&& futureCommandConnectionPool.getStatus()
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.equals(Status.ACTIVE);
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}
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/**
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* {@inheritDoc}
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* <p/>
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* we continue while the connection pool is active
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*/
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@Override
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protected boolean shouldDoWork() {
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return super.shouldDoWork() && futureCommandConnectionPool.getStatus().equals(Status.ACTIVE);
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}
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@Override
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protected void doShutdown() {
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exception.compareAndSet(null, futureCommandConnectionPool
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.getException());
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while (!commandQueue.isEmpty()) {
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FutureCommand<?, ?, ?> command = (FutureCommand<?, ?, ?>) commandQueue
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.remove();
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if (command != null) {
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if (exception.get() != null)
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command.setException(exception.get());
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else
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command.cancel(true);
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}
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}
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}
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/**
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* {@inheritDoc}
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*
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* If the reason we are shutting down is due an exception, we set that exception on all pending
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* commands. Otherwise, we cancel the pending commands.
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*/
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@Override
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protected void doShutdown() {
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exception.compareAndSet(null, futureCommandConnectionPool.getException());
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while (!commandQueue.isEmpty()) {
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FutureCommand<?, ?, ?> command = (FutureCommand<?, ?, ?>) commandQueue.remove();
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if (command != null) {
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if (exception.get() != null)
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command.setException(exception.get());
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else
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command.cancel(true);
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}
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}
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}
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@Override
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protected void doWork() throws InterruptedException {
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O command = commandQueue.poll(1, TimeUnit.SECONDS);
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if (command != null) {
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try {
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invoke(command);
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} catch (Exception e) {
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Utils.<InterruptedException> rethrowIfRuntimeOrSameType(e);
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logger.error(e, "Error processing command %s", command);
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}
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}
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}
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@Override
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protected void doWork() throws InterruptedException {
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takeACommandOffTheQueueAndInvokeIt();
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}
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public void submit(O command) {
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exceptionIfNotActive();
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commandQueue.add(command);
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}
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private void takeACommandOffTheQueueAndInvokeIt() throws InterruptedException {
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O command = commandQueue.poll(1, TimeUnit.SECONDS);
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if (command != null) {
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try {
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invoke(command);
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} catch (Exception e) {
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Utils.<InterruptedException> rethrowIfRuntimeOrSameType(e);
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logger.error(e, "Error processing command %s", command);
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}
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}
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}
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protected void invoke(O command) {
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exceptionIfNotActive();
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FutureCommandConnectionHandle<C, O> connectionHandle = null;
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try {
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connectionHandle = futureCommandConnectionPool.getHandle(command);
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} catch (InterruptedException e) {
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logger
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.warn(
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e,
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"Interrupted getting a connection for command %1$s; retrying",
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command);
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commandQueue.add(command);
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return;
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} catch (TimeoutException e) {
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logger.warn(e,
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"Timeout getting a connection for command %1$s; retrying",
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command);
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commandQueue.add(command);
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return;
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}
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/**
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* This is an asynchronous operation that puts the <code>command</code> onto a queue. Later, it
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* will be processed via the {@link #invoke(FutureCommand) invoke} method.
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*/
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public void submit(O command) {
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exceptionIfNotActive();
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commandQueue.add(command);
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}
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if (connectionHandle == null) {
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logger.error(
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"Failed to obtain connection for command %1$s; retrying",
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command);
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commandQueue.add(command);
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return;
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}
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connectionHandle.startConnection();
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}
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/**
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* Invoke binds a command with a connection from the pool. This binding is called a
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* {@link FutureCommandConnectionHandle handle}. The handle will keep this binding until the
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* command's response is parsed or an exception is set on the Command object.
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*
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* @param command
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*/
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protected void invoke(O command) {
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exceptionIfNotActive();
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FutureCommandConnectionHandle<C, O> connectionHandle = null;
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try {
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connectionHandle = futureCommandConnectionPool.getHandle(command);
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} catch (InterruptedException e) {
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logger.warn(e, "Interrupted getting a connection for command %1$s; retrying", command);
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commandQueue.add(command);
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return;
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} catch (TimeoutException e) {
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logger.warn(e, "Timeout getting a connection for command %1$s; retrying", command);
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commandQueue.add(command);
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return;
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}
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@Override
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public String toString() {
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final StringBuilder sb = new StringBuilder();
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sb.append("FutureCommandConnectionPoolClient");
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sb.append("{status=").append(status);
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sb.append(", commandQueue=").append(
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(commandQueue != null) ? commandQueue.size() : 0);
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sb.append(", futureCommandConnectionPool=").append(
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futureCommandConnectionPool);
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sb.append('}');
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return sb.toString();
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}
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if (connectionHandle == null) {
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logger.error("Failed to obtain connection for command %1$s; retrying", command);
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commandQueue.add(command);
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return;
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}
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connectionHandle.startConnection();
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}
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@Override
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public String toString() {
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final StringBuilder sb = new StringBuilder();
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sb.append("FutureCommandConnectionPoolClient");
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sb.append("{status=").append(status);
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sb.append(", commandQueue=").append((commandQueue != null) ? commandQueue.size() : 0);
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sb.append(", futureCommandConnectionPool=").append(futureCommandConnectionPool);
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sb.append('}');
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return sb.toString();
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}
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}
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@ -28,7 +28,8 @@ import org.jclouds.http.commands.callables.xml.ParseSax;
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import com.google.inject.Inject;
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/**
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* // TODO: Adrian: Document this!
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* temporary factory until guice can do multi-type assisted inject
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* @see <a href="http://code.google.com/p/google-guice/issues/detail?id=346" />
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*
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* @author Adrian Cole
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*/
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@ -38,137 +38,137 @@ import org.jclouds.logging.Logger;
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* @author Adrian Cole
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*/
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public abstract class BaseLifeCycle implements Runnable, LifeCycle {
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@Resource
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protected Logger logger = Logger.NULL;
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protected final ExecutorService executor;
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protected final BaseLifeCycle[] dependencies;
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protected final Object statusLock;
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protected volatile Status status;
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protected AtomicReference<Exception> exception = new AtomicReference<Exception>();
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@Resource
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protected Logger logger = Logger.NULL;
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protected final ExecutorService executor;
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protected final BaseLifeCycle[] dependencies;
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protected final Object statusLock;
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protected volatile Status status;
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protected AtomicReference<Exception> exception = new AtomicReference<Exception>();
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public BaseLifeCycle(ExecutorService executor,
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BaseLifeCycle... dependencies) {
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this.executor = executor;
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this.dependencies = dependencies;
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this.statusLock = new Object();
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this.status = Status.INACTIVE;
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}
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public BaseLifeCycle(ExecutorService executor, BaseLifeCycle... dependencies) {
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this.executor = executor;
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this.dependencies = dependencies;
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this.statusLock = new Object();
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this.status = Status.INACTIVE;
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}
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public Status getStatus() {
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return status;
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}
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public Status getStatus() {
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return status;
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}
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public void run() {
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try {
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while (shouldDoWork()) {
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doWork();
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}
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} catch (Exception e) {
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logger.error(e, "Exception doing work");
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exception.set(e);
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}
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this.status = Status.SHUTTING_DOWN;
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doShutdown();
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this.status = Status.SHUT_DOWN;
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logger.info("%1$s", this);
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}
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public void run() {
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try {
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while (shouldDoWork()) {
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doWork();
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}
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} catch (Exception e) {
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logger.error(e, "Exception doing work");
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exception.set(e);
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}
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this.status = Status.SHUTTING_DOWN;
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doShutdown();
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this.status = Status.SHUT_DOWN;
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logger.info("%1$s", this);
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}
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protected abstract void doWork() throws Exception;
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protected abstract void doWork() throws Exception;
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protected abstract void doShutdown();
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protected abstract void doShutdown();
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protected boolean shouldDoWork() {
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try {
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exceptionIfDepedenciesNotActive();
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} catch (IllegalStateException e) {
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return false;
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}
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return status.equals(Status.ACTIVE) && exception.get() == null;
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}
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/**
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* @return false if any dependencies are inactive, or we are inactive, or we have a global
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* exception.
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*/
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protected boolean shouldDoWork() {
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try {
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exceptionIfDepedenciesNotActive();
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} catch (IllegalStateException e) {
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return false;
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}
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return status.equals(Status.ACTIVE) && exception.get() == null;
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}
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@PostConstruct
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public void start() {
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logger.info("starting %1$s", this);
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synchronized (this.statusLock) {
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if (this.status.compareTo(Status.SHUTDOWN_REQUEST) >= 0) {
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doShutdown();
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this.status = Status.SHUT_DOWN;
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this.statusLock.notifyAll();
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return;
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}
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if (this.status.compareTo(Status.ACTIVE) == 0) {
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this.statusLock.notifyAll();
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return;
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}
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@PostConstruct
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public void start() {
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logger.info("starting %1$s", this);
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synchronized (this.statusLock) {
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if (this.status.compareTo(Status.SHUTDOWN_REQUEST) >= 0) {
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doShutdown();
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this.status = Status.SHUT_DOWN;
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this.statusLock.notifyAll();
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return;
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}
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if (this.status.compareTo(Status.ACTIVE) == 0) {
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this.statusLock.notifyAll();
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return;
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}
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if (this.status.compareTo(Status.INACTIVE) != 0) {
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throw new IllegalStateException("Illegal state: " + this.status);
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}
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if (this.status.compareTo(Status.INACTIVE) != 0) {
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throw new IllegalStateException("Illegal state: " + this.status);
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}
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exceptionIfDepedenciesNotActive();
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exceptionIfDepedenciesNotActive();
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this.status = Status.ACTIVE;
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}
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executor.execute(this);
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}
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this.status = Status.ACTIVE;
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}
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executor.execute(this);
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}
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protected void exceptionIfDepedenciesNotActive() {
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for (BaseLifeCycle dependency : dependencies) {
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if (dependency.status.compareTo(Status.ACTIVE) != 0) {
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throw new IllegalStateException(String.format(
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"Illegal state: %1$s for component: %2$s",
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dependency.status, dependency));
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}
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}
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}
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protected void exceptionIfDepedenciesNotActive() {
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for (BaseLifeCycle dependency : dependencies) {
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if (dependency.status.compareTo(Status.ACTIVE) != 0) {
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throw new IllegalStateException(String.format(
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"Illegal state: %1$s for component: %2$s", dependency.status, dependency));
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}
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}
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}
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public Exception getException() {
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return this.exception.get();
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}
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public Exception getException() {
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return this.exception.get();
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}
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protected void awaitShutdown(long timeout) throws InterruptedException {
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awaitStatus(Status.SHUT_DOWN, timeout);
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}
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protected void awaitShutdown(long timeout) throws InterruptedException {
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awaitStatus(Status.SHUT_DOWN, timeout);
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}
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protected void awaitStatus(Status intended, long timeout)
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throws InterruptedException {
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synchronized (this.statusLock) {
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long deadline = System.currentTimeMillis() + timeout;
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long remaining = timeout;
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while (this.status != intended) {
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this.statusLock.wait(remaining);
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if (timeout > 0) {
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remaining = deadline - System.currentTimeMillis();
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if (remaining <= 0) {
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break;
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}
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}
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}
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}
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}
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protected void awaitStatus(Status intended, long timeout) throws InterruptedException {
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synchronized (this.statusLock) {
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long deadline = System.currentTimeMillis() + timeout;
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long remaining = timeout;
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while (this.status != intended) {
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this.statusLock.wait(remaining);
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if (timeout > 0) {
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remaining = deadline - System.currentTimeMillis();
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if (remaining <= 0) {
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break;
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}
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}
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}
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}
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}
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@PreDestroy
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public void shutdown() {
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shutdown(2000);
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}
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@PreDestroy
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public void shutdown() {
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shutdown(2000);
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}
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public void shutdown(long waitMs) {
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synchronized (this.statusLock) {
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if (this.status.compareTo(Status.ACTIVE) > 0) {
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return;
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}
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this.status = Status.SHUTDOWN_REQUEST;
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try {
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awaitShutdown(waitMs);
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} catch (InterruptedException ignore) {
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}
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}
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}
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public void shutdown(long waitMs) {
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synchronized (this.statusLock) {
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if (this.status.compareTo(Status.ACTIVE) > 0) {
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return;
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}
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this.status = Status.SHUTDOWN_REQUEST;
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try {
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awaitShutdown(waitMs);
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} catch (InterruptedException ignore) {
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}
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}
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}
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protected void exceptionIfNotActive() {
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if (!status.equals(Status.ACTIVE))
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throw new IllegalStateException(String.format("not active: %1$s",
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this));
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}
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protected void exceptionIfNotActive() {
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if (!status.equals(Status.ACTIVE))
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throw new IllegalStateException(String.format("not active: %1$s", this));
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}
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}
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@ -30,21 +30,21 @@ import java.util.Collections;
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import java.util.List;
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/**
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* // TODO: Adrian: Document this!
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*
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* This will close objects in the reverse order that they were added.
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*
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* @author Adrian Cole
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*/
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public class Closer implements Closeable {
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List<Closeable> methodsToClose = new ArrayList<Closeable>();
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List<Closeable> methodsToClose = new ArrayList<Closeable>();
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public void addToClose(Closeable toClose) {
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methodsToClose.add(toClose);
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}
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public void addToClose(Closeable toClose) {
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methodsToClose.add(toClose);
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}
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public void close() throws IOException {
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Collections.reverse(methodsToClose);
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for (Closeable toClose : methodsToClose) {
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toClose.close();
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}
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}
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public void close() throws IOException {
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Collections.reverse(methodsToClose);
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for (Closeable toClose : methodsToClose) {
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toClose.close();
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}
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}
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}
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|
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@ -48,82 +48,85 @@ import com.google.inject.spi.TypeEncounter;
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import com.google.inject.spi.TypeListener;
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/**
|
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* // TODO: Adrian: Document this!
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* This associates java lifecycle annotations with guice hooks. For example, we invoke
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* {@link PostConstruct} after injection, and Associate {@link PostDestroy} with a global
|
||||
* {@link Closer} object.
|
||||
*
|
||||
* @author Adrian Cole
|
||||
*/
|
||||
public class LifeCycleModule extends AbstractModule {
|
||||
|
||||
protected void configure() {
|
||||
final ExecutorService executor = Executors.newCachedThreadPool();
|
||||
bind(ExecutorService.class).toInstance(executor);
|
||||
Closer closer = new Closer();
|
||||
closer.addToClose(new Closeable() {
|
||||
public void close() throws IOException {
|
||||
executor.shutdownNow();
|
||||
}
|
||||
});
|
||||
bind(Closer.class).toInstance(closer);
|
||||
bindPostInjectionInvoke(closer);
|
||||
}
|
||||
protected void configure() {
|
||||
final ExecutorService executor = Executors.newCachedThreadPool();
|
||||
bind(ExecutorService.class).toInstance(executor);
|
||||
Closer closer = new Closer();
|
||||
closer.addToClose(new Closeable() {
|
||||
public void close() throws IOException {
|
||||
executor.shutdownNow();
|
||||
}
|
||||
});
|
||||
bind(Closer.class).toInstance(closer);
|
||||
bindPostInjectionInvoke(closer);
|
||||
}
|
||||
|
||||
protected void bindPostInjectionInvoke(final Closer closer) {
|
||||
bindListener(any(), new TypeListener() {
|
||||
public <I> void hear(TypeLiteral<I> injectableType,
|
||||
TypeEncounter<I> encounter) {
|
||||
Set<Method> methods = new HashSet<Method>();
|
||||
Class<? super I> type = injectableType.getRawType();
|
||||
while (type != null) {
|
||||
methods.addAll(Arrays.asList(type.getDeclaredMethods()));
|
||||
type = type.getSuperclass();
|
||||
}
|
||||
for (final Method method : methods) {
|
||||
PostConstruct postConstruct = method
|
||||
.getAnnotation(PostConstruct.class);
|
||||
if (postConstruct != null) {
|
||||
encounter.register(new InjectionListener<I>() {
|
||||
public void afterInjection(I injectee) {
|
||||
try {
|
||||
method.invoke(injectee);
|
||||
} catch (InvocationTargetException ie) {
|
||||
Throwable e = ie.getTargetException();
|
||||
throw new ProvisionException(
|
||||
e.getMessage(), e);
|
||||
} catch (IllegalAccessException e) {
|
||||
throw new ProvisionException(
|
||||
e.getMessage(), e);
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
protected void bindPostInjectionInvoke(final Closer closer) {
|
||||
bindListener(any(), new TypeListener() {
|
||||
public <I> void hear(TypeLiteral<I> injectableType, TypeEncounter<I> encounter) {
|
||||
Set<Method> methods = new HashSet<Method>();
|
||||
Class<? super I> type = injectableType.getRawType();
|
||||
while (type != null) {
|
||||
methods.addAll(Arrays.asList(type.getDeclaredMethods()));
|
||||
type = type.getSuperclass();
|
||||
}
|
||||
for (final Method method : methods) {
|
||||
invokePostConstructMethodAfterInjection(encounter, method);
|
||||
associatePreDestroyWithCloser(closer, encounter, method);
|
||||
}
|
||||
}
|
||||
|
||||
PreDestroy preDestroy = method
|
||||
.getAnnotation(PreDestroy.class);
|
||||
if (preDestroy != null) {
|
||||
encounter.register(new InjectionListener<I>() {
|
||||
public void afterInjection(final I injectee) {
|
||||
closer.addToClose(new Closeable() {
|
||||
public void close() throws IOException {
|
||||
try {
|
||||
method.invoke(injectee);
|
||||
} catch (InvocationTargetException ie) {
|
||||
Throwable e = ie
|
||||
.getTargetException();
|
||||
throw new IOException(e
|
||||
.getMessage());
|
||||
} catch (IllegalAccessException e) {
|
||||
throw new IOException(e
|
||||
.getMessage());
|
||||
}
|
||||
}
|
||||
});
|
||||
private <I> void associatePreDestroyWithCloser(final Closer closer,
|
||||
TypeEncounter<I> encounter, final Method method) {
|
||||
PreDestroy preDestroy = method.getAnnotation(PreDestroy.class);
|
||||
if (preDestroy != null) {
|
||||
encounter.register(new InjectionListener<I>() {
|
||||
public void afterInjection(final I injectee) {
|
||||
closer.addToClose(new Closeable() {
|
||||
public void close() throws IOException {
|
||||
try {
|
||||
method.invoke(injectee);
|
||||
} catch (InvocationTargetException ie) {
|
||||
Throwable e = ie.getTargetException();
|
||||
throw new IOException(e.getMessage());
|
||||
} catch (IllegalAccessException e) {
|
||||
throw new IOException(e.getMessage());
|
||||
}
|
||||
}
|
||||
});
|
||||
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
private <I> void invokePostConstructMethodAfterInjection(TypeEncounter<I> encounter,
|
||||
final Method method) {
|
||||
PostConstruct postConstruct = method.getAnnotation(PostConstruct.class);
|
||||
if (postConstruct != null) {
|
||||
encounter.register(new InjectionListener<I>() {
|
||||
public void afterInjection(I injectee) {
|
||||
try {
|
||||
method.invoke(injectee);
|
||||
} catch (InvocationTargetException ie) {
|
||||
Throwable e = ie.getTargetException();
|
||||
throw new ProvisionException(e.getMessage(), e);
|
||||
} catch (IllegalAccessException e) {
|
||||
throw new ProvisionException(e.getMessage(), e);
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue