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* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.tools.visualvm.host;
import com.sun.tools.visualvm.core.datasource.DataSource;
import com.sun.tools.visualvm.core.datasource.descriptor.DataSourceDescriptorFactory;
import com.sun.tools.visualvm.core.datasupport.Utils;
import com.sun.tools.visualvm.host.impl.HostDescriptorProvider;
import com.sun.tools.visualvm.host.impl.HostProperties;
import com.sun.tools.visualvm.host.impl.HostProvider;
import com.sun.tools.visualvm.host.impl.HostsSupportImpl;
import java.io.File;
import java.net.InetAddress;
/**
* Support for hosts in VisualVM.
*
* @author Jiri Sedlacek
*/
public final class HostsSupport {
private static final Object hostsStorageDirectoryLock = new Object();
// @GuardedBy hostsStorageDirectoryLock
private static File hostsStorageDirectory;
private static HostsSupport instance;
private final HostProvider hostProvider = new HostProvider();
/**
* Returns singleton instance of HostsSupport.
*
* @return singleton instance of HostsSupport.
*/
public static synchronized HostsSupport getInstance() {
if (instance == null) instance = new HostsSupport();
return instance;
}
/**
* Creates new host from provided hostname. Displays a popup dialog if wrong
* hostname is provided or the host has already been defined.
*
* @param hostname hostname of the host to be created.
* @return new host from provided hostname or null if the hostname could not be resolved.
*/
public Host createHost(String hostname) {
return createHost(new HostProperties(hostname, hostname, null), true, true);
}
/**
* Creates new host from provided hostname and display name. Displays a popup
* dialog if wrong hostname is provided or the host has already been defined.
*
* @param hostname hostname of the host to be created.
* @param displayname displayname of the host to be created.
* @return new host from provided hostname or null if the hostname could not be resolved.
*/
public Host createHost(String hostname, String displayname) {
return createHost(new HostProperties(hostname, displayname, null), true, true);
}
/**
* Returns an existing Host instance or creates a new Host if needed.
*
* @param hostname hostname of the host to be created
* @param interactive true if any failure should be visually presented to the user, false otherwise.
* @return an existing or a newly created Host
*
* @since VisualVM 1.1.1
*/
public Host getOrCreateHost(String hostname, boolean interactive) {
return createHost(new HostProperties(hostname, hostname, null), false, interactive);
}
Host createHost(HostProperties properties, boolean createOnly, boolean interactive) {
return hostProvider.createHost(properties, createOnly, interactive);
}
/**
* Returns already known Host instance with the same InetAddress or null.
*
* @param inetAddress InetAddess to search.
* @return already known Host instance with the same InetAddress or null.
*/
public Host getHostByAddress(InetAddress inetAddress) {
return hostProvider.getHostByAddress(inetAddress);
}
/**
* Returns storage directory for defined hosts.
*
* @return storage directory for defined hosts.
*/
public static File getStorageDirectory() {
synchronized(hostsStorageDirectoryLock) {
if (hostsStorageDirectory == null) {
String snapshotsStorageString = HostsSupportImpl.getStorageDirectoryString();
hostsStorageDirectory = new File(snapshotsStorageString);
if (hostsStorageDirectory.exists() && hostsStorageDirectory.isFile())
throw new IllegalStateException("Cannot create hosts storage directory " + snapshotsStorageString + ", file in the way"); // NOI18N
if (hostsStorageDirectory.exists() && (!hostsStorageDirectory.canRead() || !hostsStorageDirectory.canWrite()))
throw new IllegalStateException("Cannot access hosts storage directory " + snapshotsStorageString + ", read&write permission required"); // NOI18N
if (!Utils.prepareDirectory(hostsStorageDirectory))
throw new IllegalStateException("Cannot create hosts storage directory " + snapshotsStorageString); // NOI18N
}
return hostsStorageDirectory;
}
}
/**
* Returns true if the storage directory for defined hosts already exists, false otherwise.
*
* @return true if the storage directory for defined hosts already exists, false otherwise.
*/
public static boolean storageDirectoryExists() {
return new File(HostsSupportImpl.getStorageDirectoryString()).isDirectory();
}
Host createLocalHost() {
return hostProvider.createLocalHost();
}
Host createUnknownHost() {
return hostProvider.createUnknownHost();
}
private HostsSupport() {
DataSourceDescriptorFactory.getDefault().registerProvider(new HostDescriptorProvider());
RemoteHostsContainer container = RemoteHostsContainer.sharedInstance();
DataSource.ROOT.getRepository().addDataSource(container);
hostProvider.initialize();
}
}