All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.apache.flink.runtime.blob.BlobServer Maven / Gradle / Ivy

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.blob;

import org.apache.flink.annotation.VisibleForTesting;
import org.apache.flink.api.common.JobID;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.configuration.BlobServerOptions;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.net.SSLUtils;
import org.apache.flink.util.ExceptionUtils;
import org.apache.flink.util.FileUtils;
import org.apache.flink.util.NetUtils;
import org.apache.flink.util.ShutdownHookUtil;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nullable;
import javax.net.ssl.SSLContext;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.security.MessageDigest;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.Timer;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;

import static org.apache.flink.runtime.blob.BlobKey.BlobType.PERMANENT_BLOB;
import static org.apache.flink.runtime.blob.BlobKey.BlobType.TRANSIENT_BLOB;
import static org.apache.flink.runtime.blob.BlobServerProtocol.BUFFER_SIZE;
import static org.apache.flink.util.Preconditions.checkArgument;
import static org.apache.flink.util.Preconditions.checkNotNull;

/**
 * This class implements the BLOB server. The BLOB server is responsible for listening for incoming requests and
 * spawning threads to handle these requests. Furthermore, it takes care of creating the directory structure to store
 * the BLOBs or temporarily cache them.
 */
public class BlobServer extends Thread implements BlobService, BlobWriter, PermanentBlobService, TransientBlobService {

	/** The log object used for debugging. */
	private static final Logger LOG = LoggerFactory.getLogger(BlobServer.class);

	/** Counter to generate unique names for temporary files. */
	private final AtomicLong tempFileCounter = new AtomicLong(0);

	/** The server socket listening for incoming connections. */
	private final ServerSocket serverSocket;

	/** The SSL server context if ssl is enabled for the connections. */
	private final SSLContext serverSSLContext;

	/** Blob Server configuration. */
	private final Configuration blobServiceConfiguration;

	/** Indicates whether a shutdown of server component has been requested. */
	private final AtomicBoolean shutdownRequested = new AtomicBoolean();

	/** Root directory for local file storage. */
	private final File storageDir;

	/** Blob store for distributed file storage, e.g. in HA. */
	private final BlobStore blobStore;

	/** Set of currently running threads. */
	private final Set activeConnections = new HashSet<>();

	/** The maximum number of concurrent connections. */
	private final int maxConnections;

	/** Lock guarding concurrent file accesses. */
	private final ReadWriteLock readWriteLock;

	/**
	 * Shutdown hook thread to ensure deletion of the local storage directory.
	 */
	private final Thread shutdownHook;

	// --------------------------------------------------------------------------------------------

	/**
	 * Map to store the TTL of each element stored in the local storage, i.e. via one of the {@link
	 * #getFile} methods.
	 **/
	private final ConcurrentHashMap, Long> blobExpiryTimes =
		new ConcurrentHashMap<>();

	/** Time interval (ms) to run the cleanup task; also used as the default TTL. */
	private final long cleanupInterval;

	/**
	 * Timer task to execute the cleanup at regular intervals.
	 */
	private final Timer cleanupTimer;

	/**
	 * Instantiates a new BLOB server and binds it to a free network port.
	 *
	 * @param config Configuration to be used to instantiate the BlobServer
	 * @param blobStore BlobStore to store blobs persistently
	 *
	 * @throws IOException
	 * 		thrown if the BLOB server cannot bind to a free network port or if the
	 * 		(local or distributed) file storage cannot be created or is not usable
	 */
	public BlobServer(Configuration config, BlobStore blobStore) throws IOException {
		this.blobServiceConfiguration = checkNotNull(config);
		this.blobStore = checkNotNull(blobStore);
		this.readWriteLock = new ReentrantReadWriteLock();

		// configure and create the storage directory
		this.storageDir = BlobUtils.initLocalStorageDirectory(config);
		LOG.info("Created BLOB server storage directory {}", storageDir);

		// configure the maximum number of concurrent connections
		final int maxConnections = config.getInteger(BlobServerOptions.FETCH_CONCURRENT);
		if (maxConnections >= 1) {
			this.maxConnections = maxConnections;
		}
		else {
			LOG.warn("Invalid value for maximum connections in BLOB server: {}. Using default value of {}",
					maxConnections, BlobServerOptions.FETCH_CONCURRENT.defaultValue());
			this.maxConnections = BlobServerOptions.FETCH_CONCURRENT.defaultValue();
		}

		// configure the backlog of connections
		int backlog = config.getInteger(BlobServerOptions.FETCH_BACKLOG);
		if (backlog < 1) {
			LOG.warn("Invalid value for BLOB connection backlog: {}. Using default value of {}",
					backlog, BlobServerOptions.FETCH_BACKLOG.defaultValue());
			backlog = BlobServerOptions.FETCH_BACKLOG.defaultValue();
		}

		// Initializing the clean up task
		this.cleanupTimer = new Timer(true);

		this.cleanupInterval = config.getLong(BlobServerOptions.CLEANUP_INTERVAL) * 1000;
		this.cleanupTimer
			.schedule(new TransientBlobCleanupTask(blobExpiryTimes, readWriteLock.writeLock(),
				storageDir, LOG), cleanupInterval, cleanupInterval);

		this.shutdownHook = ShutdownHookUtil.addShutdownHook(this, getClass().getSimpleName(), LOG);

		if (config.getBoolean(BlobServerOptions.SSL_ENABLED)) {
			try {
				serverSSLContext = SSLUtils.createSSLServerContext(config);
			} catch (Exception e) {
				throw new IOException("Failed to initialize SSLContext for the blob server", e);
			}
		} else {
			serverSSLContext = null;
		}

		//  ----------------------- start the server -------------------

		String serverPortRange = config.getString(BlobServerOptions.PORT);

		Iterator ports = NetUtils.getPortRangeFromString(serverPortRange);

		final int finalBacklog = backlog;
		ServerSocket socketAttempt = NetUtils.createSocketFromPorts(ports, new NetUtils.SocketFactory() {
			@Override
			public ServerSocket createSocket(int port) throws IOException {
				if (serverSSLContext == null) {
					return new ServerSocket(port, finalBacklog);
				} else {
					LOG.info("Enabling ssl for the blob server");
					return serverSSLContext.getServerSocketFactory().createServerSocket(port, finalBacklog);
				}
			}
		});

		if (socketAttempt == null) {
			throw new IOException("Unable to allocate socket for blob server in specified port range: " + serverPortRange);
		} else {
			SSLUtils.setSSLVerAndCipherSuites(socketAttempt, config);
			this.serverSocket = socketAttempt;
		}

		// start the server thread
		setName("BLOB Server listener at " + getPort());
		setDaemon(true);

		if (LOG.isInfoEnabled()) {
			LOG.info("Started BLOB server at {}:{} - max concurrent requests: {} - max backlog: {}",
					serverSocket.getInetAddress().getHostAddress(), getPort(), maxConnections, backlog);
		}
	}

	// --------------------------------------------------------------------------------------------
	//  Path Accessors
	// --------------------------------------------------------------------------------------------

	/**
	 * Returns a file handle to the file associated with the given blob key on the blob
	 * server.
	 *
	 * 

This is only called from {@link BlobServerConnection} or unit tests. * * @param jobId ID of the job this blob belongs to (or null if job-unrelated) * @param key identifying the file * @return file handle to the file * * @throws IOException * if creating the directory fails */ @VisibleForTesting public File getStorageLocation(@Nullable JobID jobId, BlobKey key) throws IOException { return BlobUtils.getStorageLocation(storageDir, jobId, key); } /** * Returns a temporary file inside the BLOB server's incoming directory. * * @return a temporary file inside the BLOB server's incoming directory * * @throws IOException * if creating the directory fails */ File createTemporaryFilename() throws IOException { return new File(BlobUtils.getIncomingDirectory(storageDir), String.format("temp-%08d", tempFileCounter.getAndIncrement())); } /** * Returns the lock used to guard file accesses. */ ReadWriteLock getReadWriteLock() { return readWriteLock; } @Override public void run() { try { while (!this.shutdownRequested.get()) { BlobServerConnection conn = new BlobServerConnection(serverSocket.accept(), this); try { synchronized (activeConnections) { while (activeConnections.size() >= maxConnections) { activeConnections.wait(2000); } activeConnections.add(conn); } conn.start(); conn = null; } finally { if (conn != null) { conn.close(); synchronized (activeConnections) { activeConnections.remove(conn); } } } } } catch (Throwable t) { if (!this.shutdownRequested.get()) { LOG.error("BLOB server stopped working. Shutting down", t); try { close(); } catch (Throwable closeThrowable) { LOG.error("Could not properly close the BlobServer.", closeThrowable); } } } } /** * Shuts down the BLOB server. */ @Override public void close() throws IOException { cleanupTimer.cancel(); if (shutdownRequested.compareAndSet(false, true)) { Exception exception = null; try { this.serverSocket.close(); } catch (IOException ioe) { exception = ioe; } // wake the thread up, in case it is waiting on some operation interrupt(); try { join(); } catch (InterruptedException ie) { Thread.currentThread().interrupt(); LOG.debug("Error while waiting for this thread to die.", ie); } synchronized (activeConnections) { if (!activeConnections.isEmpty()) { for (BlobServerConnection conn : activeConnections) { LOG.debug("Shutting down connection {}.", conn.getName()); conn.close(); } activeConnections.clear(); } } // Clean up the storage directory try { FileUtils.deleteDirectory(storageDir); } catch (IOException e) { exception = ExceptionUtils.firstOrSuppressed(e, exception); } // Remove shutdown hook to prevent resource leaks ShutdownHookUtil.removeShutdownHook(shutdownHook, getClass().getSimpleName(), LOG); if (LOG.isInfoEnabled()) { LOG.info("Stopped BLOB server at {}:{}", serverSocket.getInetAddress().getHostAddress(), getPort()); } ExceptionUtils.tryRethrowIOException(exception); } } protected BlobClient createClient() throws IOException { return new BlobClient(new InetSocketAddress(serverSocket.getInetAddress(), getPort()), blobServiceConfiguration); } /** * Retrieves the local path of a (job-unrelated) file associated with a job and a blob key. * *

The blob server looks the blob key up in its local storage. If the file exists, it is * returned. If the file does not exist, it is retrieved from the HA blob store (if available) * or a {@link FileNotFoundException} is thrown. * * @param key * blob key associated with the requested file * * @return file referring to the local storage location of the BLOB * * @throws IOException * Thrown if the file retrieval failed. */ @Override public File getFile(TransientBlobKey key) throws IOException { return getFileInternal(null, key); } /** * Retrieves the local path of a file associated with a job and a blob key. * *

The blob server looks the blob key up in its local storage. If the file exists, it is * returned. If the file does not exist, it is retrieved from the HA blob store (if available) * or a {@link FileNotFoundException} is thrown. * * @param jobId * ID of the job this blob belongs to * @param key * blob key associated with the requested file * * @return file referring to the local storage location of the BLOB * * @throws IOException * Thrown if the file retrieval failed. */ @Override public File getFile(JobID jobId, TransientBlobKey key) throws IOException { checkNotNull(jobId); return getFileInternal(jobId, key); } /** * Returns the path to a local copy of the file associated with the provided job ID and blob * key. * *

We will first attempt to serve the BLOB from the local storage. If the BLOB is not in * there, we will try to download it from the HA store. * * @param jobId * ID of the job this blob belongs to * @param key * blob key associated with the requested file * * @return The path to the file. * * @throws java.io.FileNotFoundException * if the BLOB does not exist; * @throws IOException * if any other error occurs when retrieving the file */ @Override public File getFile(JobID jobId, PermanentBlobKey key) throws IOException { checkNotNull(jobId); return getFileInternal(jobId, key); } /** * Retrieves the local path of a file associated with a job and a blob key. * *

The blob server looks the blob key up in its local storage. If the file exists, it is * returned. If the file does not exist, it is retrieved from the HA blob store (if available) * or a {@link FileNotFoundException} is thrown. * * @param jobId * ID of the job this blob belongs to (or null if job-unrelated) * @param blobKey * blob key associated with the requested file * * @return file referring to the local storage location of the BLOB * * @throws IOException * Thrown if the file retrieval failed. */ private File getFileInternal(@Nullable JobID jobId, BlobKey blobKey) throws IOException { checkArgument(blobKey != null, "BLOB key cannot be null."); final File localFile = BlobUtils.getStorageLocation(storageDir, jobId, blobKey); readWriteLock.readLock().lock(); try { getFileInternal(jobId, blobKey, localFile); return localFile; } finally { readWriteLock.readLock().unlock(); } } /** * Helper to retrieve the local path of a file associated with a job and a blob key. * *

The blob server looks the blob key up in its local storage. If the file exists, it is * returned. If the file does not exist, it is retrieved from the HA blob store (if available) * or a {@link FileNotFoundException} is thrown. * *

Assumes the read lock has already been acquired. * * @param jobId * ID of the job this blob belongs to (or null if job-unrelated) * @param blobKey * blob key associated with the requested file * @param localFile * (local) file where the blob is/should be stored * * @throws IOException * Thrown if the file retrieval failed. */ void getFileInternal(@Nullable JobID jobId, BlobKey blobKey, File localFile) throws IOException { // assume readWriteLock.readLock() was already locked (cannot really check that) if (localFile.exists()) { // update TTL for transient BLOBs: if (blobKey instanceof TransientBlobKey) { // regarding concurrent operations, it is not really important which timestamp makes // it into the map as they are close to each other anyway, also we can simply // overwrite old values as long as we are in the read (or write) lock blobExpiryTimes .put(Tuple2.of(jobId, (TransientBlobKey) blobKey), System.currentTimeMillis() + cleanupInterval); } return; } else if (blobKey instanceof PermanentBlobKey) { // Try the HA blob store // first we have to release the read lock in order to acquire the write lock readWriteLock.readLock().unlock(); // use a temporary file (thread-safe without locking) File incomingFile = null; try { incomingFile = createTemporaryFilename(); blobStore.get(jobId, blobKey, incomingFile); readWriteLock.writeLock().lock(); try { BlobUtils.moveTempFileToStore( incomingFile, jobId, blobKey, localFile, LOG, null); } finally { readWriteLock.writeLock().unlock(); } return; } finally { // delete incomingFile from a failed download if (incomingFile != null && !incomingFile.delete() && incomingFile.exists()) { LOG.warn("Could not delete the staging file {} for blob key {} and job {}.", incomingFile, blobKey, jobId); } // re-acquire lock so that it can be unlocked again outside readWriteLock.readLock().lock(); } } throw new FileNotFoundException("Local file " + localFile + " does not exist " + "and failed to copy from blob store."); } @Override public TransientBlobKey putTransient(byte[] value) throws IOException { return (TransientBlobKey) putBuffer(null, value, TRANSIENT_BLOB); } @Override public TransientBlobKey putTransient(JobID jobId, byte[] value) throws IOException { checkNotNull(jobId); return (TransientBlobKey) putBuffer(jobId, value, TRANSIENT_BLOB); } @Override public TransientBlobKey putTransient(InputStream inputStream) throws IOException { return (TransientBlobKey) putInputStream(null, inputStream, TRANSIENT_BLOB); } @Override public TransientBlobKey putTransient(JobID jobId, InputStream inputStream) throws IOException { checkNotNull(jobId); return (TransientBlobKey) putInputStream(jobId, inputStream, TRANSIENT_BLOB); } @Override public PermanentBlobKey putPermanent(JobID jobId, byte[] value) throws IOException { checkNotNull(jobId); return (PermanentBlobKey) putBuffer(jobId, value, PERMANENT_BLOB); } @Override public PermanentBlobKey putPermanent(JobID jobId, InputStream inputStream) throws IOException { checkNotNull(jobId); return (PermanentBlobKey) putInputStream(jobId, inputStream, PERMANENT_BLOB); } /** * Uploads the data of the given byte array for the given job to the BLOB server. * * @param jobId * the ID of the job the BLOB belongs to * @param value * the buffer to upload * @param blobType * whether to make the data permanent or transient * * @return the computed BLOB key identifying the BLOB on the server * * @throws IOException * thrown if an I/O error occurs while writing it to a local file, or uploading it to the HA * store */ private BlobKey putBuffer(@Nullable JobID jobId, byte[] value, BlobKey.BlobType blobType) throws IOException { if (LOG.isDebugEnabled()) { LOG.debug("Received PUT call for BLOB of job {}.", jobId); } File incomingFile = createTemporaryFilename(); MessageDigest md = BlobUtils.createMessageDigest(); BlobKey blobKey = null; try (FileOutputStream fos = new FileOutputStream(incomingFile)) { md.update(value); fos.write(value); } catch (IOException ioe) { // delete incomingFile from a failed download if (!incomingFile.delete() && incomingFile.exists()) { LOG.warn("Could not delete the staging file {} for job {}.", incomingFile, jobId); } throw ioe; } try { // persist file blobKey = moveTempFileToStore(incomingFile, jobId, md.digest(), blobType); return blobKey; } finally { // delete incomingFile from a failed download if (!incomingFile.delete() && incomingFile.exists()) { LOG.warn("Could not delete the staging file {} for blob key {} and job {}.", incomingFile, blobKey, jobId); } } } /** * Uploads the data from the given input stream for the given job to the BLOB server. * * @param jobId * the ID of the job the BLOB belongs to * @param inputStream * the input stream to read the data from * @param blobType * whether to make the data permanent or transient * * @return the computed BLOB key identifying the BLOB on the server * * @throws IOException * thrown if an I/O error occurs while reading the data from the input stream, writing it to a * local file, or uploading it to the HA store */ private BlobKey putInputStream( @Nullable JobID jobId, InputStream inputStream, BlobKey.BlobType blobType) throws IOException { if (LOG.isDebugEnabled()) { LOG.debug("Received PUT call for BLOB of job {}.", jobId); } File incomingFile = createTemporaryFilename(); MessageDigest md = BlobUtils.createMessageDigest(); BlobKey blobKey = null; try (FileOutputStream fos = new FileOutputStream(incomingFile)) { // read stream byte[] buf = new byte[BUFFER_SIZE]; while (true) { final int bytesRead = inputStream.read(buf); if (bytesRead == -1) { // done break; } fos.write(buf, 0, bytesRead); md.update(buf, 0, bytesRead); } // persist file blobKey = moveTempFileToStore(incomingFile, jobId, md.digest(), blobType); return blobKey; } finally { // delete incomingFile from a failed download if (!incomingFile.delete() && incomingFile.exists()) { LOG.warn("Could not delete the staging file {} for blob key {} and job {}.", incomingFile, blobKey, jobId); } } } /** * Moves the temporary incomingFile to its permanent location where it is available for * use. * * @param incomingFile * temporary file created during transfer * @param jobId * ID of the job this blob belongs to or null if job-unrelated * @param digest * BLOB content digest, i.e. hash * @param blobType * whether this file is a permanent or transient BLOB * * @return unique BLOB key that identifies the BLOB on the server * * @throws IOException * thrown if an I/O error occurs while moving the file or uploading it to the HA store */ BlobKey moveTempFileToStore( File incomingFile, @Nullable JobID jobId, byte[] digest, BlobKey.BlobType blobType) throws IOException { int retries = 10; int attempt = 0; while (true) { // add unique component independent of the BLOB content BlobKey blobKey = BlobKey.createKey(blobType, digest); File storageFile = BlobUtils.getStorageLocation(storageDir, jobId, blobKey); // try again until the key is unique (put the existence check into the lock!) readWriteLock.writeLock().lock(); try { if (!storageFile.exists()) { BlobUtils.moveTempFileToStore( incomingFile, jobId, blobKey, storageFile, LOG, blobKey instanceof PermanentBlobKey ? blobStore : null); // add TTL for transient BLOBs: if (blobKey instanceof TransientBlobKey) { // must be inside read or write lock to add a TTL blobExpiryTimes .put(Tuple2.of(jobId, (TransientBlobKey) blobKey), System.currentTimeMillis() + cleanupInterval); } return blobKey; } } finally { readWriteLock.writeLock().unlock(); } ++attempt; if (attempt >= retries) { String message = "Failed to find a unique key for BLOB of job " + jobId + " (last tried " + storageFile.getAbsolutePath() + "."; LOG.error(message + " No retries left."); throw new IOException(message); } else { if (LOG.isDebugEnabled()) { LOG.debug("Trying to find a unique key for BLOB of job {} (retry {}, last tried {})", jobId, attempt, storageFile.getAbsolutePath()); } } } } /** * Deletes the (job-unrelated) file associated with the blob key in the local storage of the * blob server. * * @param key * blob key associated with the file to be deleted * * @return true if the given blob is successfully deleted or non-existing; * false otherwise */ @Override public boolean deleteFromCache(TransientBlobKey key) { return deleteInternal(null, key); } /** * Deletes the file associated with the blob key in the local storage of the blob server. * * @param jobId * ID of the job this blob belongs to * @param key * blob key associated with the file to be deleted * * @return true if the given blob is successfully deleted or non-existing; * false otherwise */ @Override public boolean deleteFromCache(JobID jobId, TransientBlobKey key) { checkNotNull(jobId); return deleteInternal(jobId, key); } /** * Deletes the file associated with the blob key in the local storage of the blob server. * * @param jobId * ID of the job this blob belongs to (or null if job-unrelated) * @param key * blob key associated with the file to be deleted * * @return true if the given blob is successfully deleted or non-existing; * false otherwise */ boolean deleteInternal(@Nullable JobID jobId, TransientBlobKey key) { final File localFile = new File(BlobUtils.getStorageLocationPath(storageDir.getAbsolutePath(), jobId, key)); readWriteLock.writeLock().lock(); try { if (!localFile.delete() && localFile.exists()) { LOG.warn("Failed to locally delete BLOB " + key + " at " + localFile.getAbsolutePath()); return false; } // this needs to happen inside the write lock in case of concurrent getFile() calls blobExpiryTimes.remove(Tuple2.of(jobId, key)); return true; } finally { readWriteLock.writeLock().unlock(); } } /** * Removes all BLOBs from local and HA store belonging to the given job ID. * * @param jobId * ID of the job this blob belongs to * @param cleanupBlobStoreFiles * True if the corresponding blob store files shall be cleaned up as well. Otherwise false. * * @return true if the job directory is successfully deleted or non-existing; * false otherwise */ public boolean cleanupJob(JobID jobId, boolean cleanupBlobStoreFiles) { checkNotNull(jobId); final File jobDir = new File(BlobUtils.getStorageLocationPath(storageDir.getAbsolutePath(), jobId)); readWriteLock.writeLock().lock(); try { // delete locally boolean deletedLocally = false; try { FileUtils.deleteDirectory(jobDir); // NOTE: Instead of going through blobExpiryTimes, keep lingering entries - they // will be cleaned up by the timer task which tolerates non-existing files // If inserted again with the same IDs (via put()), the TTL will be updated // again. deletedLocally = true; } catch (IOException e) { LOG.warn("Failed to locally delete BLOB storage directory at " + jobDir.getAbsolutePath(), e); } // delete in HA blob store files final boolean deletedHA = !cleanupBlobStoreFiles || blobStore.deleteAll(jobId); return deletedLocally && deletedHA; } finally { readWriteLock.writeLock().unlock(); } } @Override public PermanentBlobService getPermanentBlobService() { return this; } @Override public TransientBlobService getTransientBlobService() { return this; } /** * Returns the configuration used by the BLOB server. * * @return configuration */ @Override public final int getMinOffloadingSize() { return blobServiceConfiguration.getInteger(BlobServerOptions.OFFLOAD_MINSIZE); } /** * Returns the port on which the server is listening. * * @return port on which the server is listening */ @Override public int getPort() { return this.serverSocket.getLocalPort(); } /** * Returns the blob expiry times - for testing purposes only! * * @return blob expiry times (internal state!) */ @VisibleForTesting ConcurrentMap, Long> getBlobExpiryTimes() { return blobExpiryTimes; } /** * Tests whether the BLOB server has been requested to shut down. * * @return True, if the server has been requested to shut down, false otherwise. */ public boolean isShutdown() { return this.shutdownRequested.get(); } /** * Access to the server socket, for testing. */ ServerSocket getServerSocket() { return this.serverSocket; } void unregisterConnection(BlobServerConnection conn) { synchronized (activeConnections) { activeConnections.remove(conn); activeConnections.notifyAll(); } } /** * Returns all the current active connections in the BlobServer. * * @return the list of all the active in current BlobServer */ List getCurrentActiveConnections() { synchronized (activeConnections) { return new ArrayList<>(activeConnections); } } }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy