Author: markt Date: Thu Sep 17 20:35:23 2015 New Revision: 1703685 URL: http://svn.apache.org/viewvc?rev=1703685&view=rev Log: Fix https://bz.apache.org/bugzilla/show_bug.cgi?id=58395 Fix multiple concurrency issues in MemberImpl Concurrent updates to some properties were likely to lead to issues. Fix the Javadoc warnings
Modified: tomcat/tc8.0.x/trunk/ (props changed) tomcat/tc8.0.x/trunk/java/org/apache/catalina/tribes/membership/MemberImpl.java tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml Propchange: tomcat/tc8.0.x/trunk/ ------------------------------------------------------------------------------ --- svn:mergeinfo (original) +++ svn:mergeinfo Thu Sep 17 20:35:23 2015 @@ -1 +1 @@ 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3358,1703408,1703486,1703509,1703523,1703542,1703545,1703554,1703584,1703673,1703676,1703678,1703680 Modified: tomcat/tc8.0.x/trunk/java/org/apache/catalina/tribes/membership/MemberImpl.java URL: http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/java/org/apache/catalina/tribes/membership/MemberImpl.java?rev=1703685&r1=1703684&r2=1703685&view=diff ============================================================================== --- tomcat/tc8.0.x/trunk/java/org/apache/catalina/tribes/membership/MemberImpl.java (original) +++ tomcat/tc8.0.x/trunk/java/org/apache/catalina/tribes/membership/MemberImpl.java Thu Sep 17 20:35:23 2015 @@ -47,21 +47,21 @@ public class MemberImpl implements Membe /** * The listen host for this member */ - protected byte[] host; - protected transient String hostname; + protected volatile byte[] host; + protected volatile transient String hostname; /** * The tcp listen port for this member */ - protected int port; + protected volatile int port; /** * The udp listen port for this member */ - protected int udpPort = -1; + protected volatile int udpPort = -1; /** * The tcp/SSL listen port for this member */ - protected int securePort = -1; + protected volatile int securePort = -1; /** * Counter for how many broadcast messages have been sent from this member @@ -87,24 +87,24 @@ public class MemberImpl implements Membe /** * Unique session Id for this member */ - protected byte[] uniqueId = new byte[16]; + protected volatile byte[] uniqueId = new byte[16]; /** * Custom payload that an app framework can broadcast * Also used to transport stop command. */ - protected byte[] payload = new byte[0]; + protected volatile byte[] payload = new byte[0]; /** * Command, so that the custom payload doesn't have to be used * This is for internal tribes use, such as SHUTDOWN_COMMAND */ - protected byte[] command = new byte[0]; + protected volatile byte[] command = new byte[0]; /** * Domain if we want to filter based on domain. */ - protected byte[] domain = new byte[0]; + protected volatile byte[] domain = new byte[0]; /** * Empty constructor for serialization @@ -114,10 +114,14 @@ public class MemberImpl implements Membe } /** - * Construct a new member object + * Construct a new member object. + * * @param host - the tcp listen host * @param port - the tcp listen port * @param aliveTime - the number of milliseconds since this member was created + * + * @throws IOException If there is an error converting the host name to an + * IP address */ public MemberImpl(String host, int port, @@ -172,7 +176,7 @@ public class MemberImpl implements Membe @Override - public int getDataLength() { + public synchronized int getDataLength() { return TRIBES_MBR_BEGIN.length+ //start pkg 4+ //data length 8+ //alive time @@ -193,7 +197,7 @@ public class MemberImpl implements Membe @Override - public byte[] getData(boolean getalive, boolean reset) { + public synchronized byte[] getData(boolean getalive, boolean reset) { if ( reset ) dataPkg = null; //look in cache first if ( dataPkg!=null ) { @@ -223,9 +227,7 @@ public class MemberImpl implements Membe //payload length - 4 bytes //payload plen bytes //end package TRIBES_MBR_END.length - byte[] addr = host; long alive=System.currentTimeMillis()-getServiceStartTime(); - byte hl = (byte)addr.length; byte[] data = new byte[getDataLength()]; int bodylength = (getDataLength() - TRIBES_MBR_BEGIN.length - TRIBES_MBR_END.length - 4); @@ -253,10 +255,10 @@ public class MemberImpl implements Membe XByteBuffer.toBytes(udpPort,data,pos); pos += 4; //host length - data[pos++] = hl; + data[pos++] = (byte) host.length; //host - System.arraycopy(addr,0,data,pos,addr.length); - pos+=addr.length; + System.arraycopy(host,0,data,pos,host.length); + pos+=host.length; //clen - 4 bytes XByteBuffer.toBytes(command.length,data,pos); pos+=4; @@ -287,9 +289,12 @@ public class MemberImpl implements Membe return data; } /** - * Deserializes a member from data sent over the wire - * @param data - the bytes received - * @return a member object. + * Deserializes a member from data sent over the wire. + * + * @param data The bytes received + * @param member The member object to populate + * + * @return The populated member object. */ public static Member getMember(byte[] data, MemberImpl member) { return getMember(data,0,data.length,member); @@ -440,6 +445,7 @@ public class MemberImpl implements Membe if ( this.hostname != null ) return hostname; else { try { + byte[] host = this.host; if (DO_DNS_LOOKUPS) this.hostname = java.net.InetAddress.getByAddress(host).getHostName(); else @@ -555,7 +561,8 @@ public class MemberImpl implements Membe /** * Returns true if the param o is a McastMember with the same name - * @param o + * + * @param o The object to test for equality */ @Override public boolean equals(Object o) { @@ -568,20 +575,22 @@ public class MemberImpl implements Membe return false; } - public void setHost(byte[] host) { + public synchronized void setHost(byte[] host) { this.host = host; } public void setHostname(String host) throws IOException { hostname = host; - this.host = java.net.InetAddress.getByName(host).getAddress(); + synchronized (this) { + this.host = java.net.InetAddress.getByName(host).getAddress(); + } } public void setMsgCount(int msgCount) { this.msgCount = msgCount; } - public void setPort(int port) { + public synchronized void setPort(int port) { this.port = port; this.dataPkg = null; } @@ -590,39 +599,50 @@ public class MemberImpl implements Membe this.serviceStartTime = serviceStartTime; } - public void setUniqueId(byte[] uniqueId) { + public synchronized void setUniqueId(byte[] uniqueId) { this.uniqueId = uniqueId!=null?uniqueId:new byte[16]; getData(true,true); } @Override - public void setPayload(byte[] payload) { - byte[] oldpayload = this.payload; - this.payload = payload!=null?payload:new byte[0]; - if ( this.getData(true,true).length > McastServiceImpl.MAX_PACKET_SIZE ) { - this.payload = oldpayload; - throw new IllegalArgumentException(sm.getString("memberImpl.large.payload")); + public synchronized void setPayload(byte[] payload) { + // longs to avoid any possibility of overflow + long oldPayloadLength = 0; + if (this.payload != null) { + oldPayloadLength = this.payload.length; } - + long newPayloadLength = 0; + if (payload != null) { + newPayloadLength = payload.length; + } + if (newPayloadLength > oldPayloadLength) { + // It is possible that the max packet size will be exceeded + if ((newPayloadLength - oldPayloadLength + getData(false, false).length) > + McastServiceImpl.MAX_PACKET_SIZE) { + throw new IllegalArgumentException(sm.getString("memberImpl.large.payload")); + } + } + this.payload = payload != null ? payload : new byte[0]; + getData(true, true); } @Override - public void setCommand(byte[] command) { + public synchronized void setCommand(byte[] command) { this.command = command!=null?command:new byte[0]; getData(true,true); } - public void setDomain(byte[] domain) { + public synchronized void setDomain(byte[] domain) { this.domain = domain!=null?domain:new byte[0]; getData(true,true); } - public void setSecurePort(int securePort) { + public synchronized void setSecurePort(int securePort) { this.securePort = securePort; this.dataPkg = null; } - public void setUdpPort(int port) { + public synchronized void setUdpPort(int port) { this.udpPort = port; this.dataPkg = null; } Modified: tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml URL: http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml?rev=1703685&r1=1703684&r2=1703685&view=diff ============================================================================== --- tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml (original) +++ tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml Thu Sep 17 20:35:23 2015 @@ -268,6 +268,11 @@ <bug>58393</bug>: Fix a data race on the listener in <code>McastService</code>. (markt) </fix> + <fix> + <bug>58395</bug>: Fix multiple data races in <code>MemberImpl</code> + that were likely to cause issues if certain properties were updated + concurrently (such updates are unlikely in normal usage). (markt) + </fix> </changelog> </subsection> <subsection name="jdbc-pool"> --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org For additional commands, e-mail: dev-h...@tomcat.apache.org