@Override
public OtpErlangObject call(
final int timeout,
final OtpErlangObject gleader,
final String module,
final String fun,
final String signature,
final Object... args0)
throws RpcException {
if (stopped) {
return null;
}
tryConnect();
OtpErlangObject result;
try {
result =
rpcHelper.rpcCall(
localNode,
data.getNodeName(),
false,
gleader,
module,
fun,
timeout,
signature,
args0);
} catch (final SignatureException e) {
throw new RpcException(e);
}
return result;
}
@Override
public void send(final String name, final Object msg) {
try {
tryConnect();
rpcHelper.send(localNode, data.getNodeName(), name, msg);
} catch (final SignatureException e) {
} catch (final RpcException e) {
}
}
@Override
public void send(final OtpErlangPid pid, final Object msg) {
try {
tryConnect();
rpcHelper.send(localNode, pid, msg);
} catch (final SignatureException e) {
} catch (final RpcException e) {
}
}
@Override
public void cast(
final OtpErlangObject gleader,
final String module,
final String fun,
final String signature,
final Object... args0)
throws RpcException {
tryConnect();
try {
rpcHelper.rpcCast(
localNode, data.getNodeName(), false, gleader, module, fun, signature, args0);
} catch (final SignatureException e) {
throw new RpcException(e);
}
}
@Override
public void async_call_result(
final IRpcResultCallback cb,
final String m,
final String f,
final String signature,
final Object... args)
throws RpcException {
final OtpErlangAtom gleader = new OtpErlangAtom("user");
try {
rpcHelper.rpcCastWithProgress(
cb, localNode, data.getNodeName(), false, gleader, m, f, signature, args);
} catch (final SignatureException e) {
throw new RpcException(e);
}
}
@Override
public void async_call_cb(
final IRpcCallback cb,
final int timeout,
final OtpErlangObject gleader,
final String module,
final String fun,
final String signature,
final Object... args)
throws RpcException {
tryConnect();
try {
rpcHelper.makeAsyncCbCall(
localNode, data.getNodeName(), cb, timeout, gleader, module, fun, signature, args);
} catch (final SignatureException e) {
throw new RpcException(e);
}
}
public class ErlRuntime implements IErlRuntime, IRpcSite {
private static final String COULD_NOT_CONNECT_TO_BACKEND =
"Could not connect to backend! Please check runtime settings.";
private static final int EPMD_PORT = 4369;
public static int DEFAULT_TIMEOUT;
{
setDefaultTimeout();
}
private static final int MAX_RETRIES = 15;
public static final int RETRY_DELAY =
Integer.parseInt(System.getProperty("erlide.connect.delay", "400"));
private static final Object connectLock = new Object();
private static final RpcHelper rpcHelper = RpcHelper.getInstance();
public enum State {
CONNECTED,
DISCONNECTED,
DOWN
}
private State state;
private final RuntimeData data;
private OtpNode localNode;
private final Object localNodeLock = new Object();
private boolean reported;
private final IProcess process;
private final boolean connectOnce;
private final IProvider<IProcess> processProvider;
private final OtpNodeStatus statusWatcher;
private OtpMbox eventBox;
private boolean stopped;
public ErlRuntime(
final String name,
final String cookie,
final IProvider<IProcess> processProvider,
final boolean reportWhenDown,
final boolean longName,
final boolean connectOnce) {
state = State.DISCONNECTED;
this.processProvider = processProvider;
process = processProvider.get();
this.connectOnce = connectOnce;
stopped = false;
data = new RuntimeData();
data.setLongName(longName);
data.setCookie(cookie);
data.setNodeName(name);
data.setReportErrors(reportWhenDown);
statusWatcher =
new OtpNodeStatus() {
@Override
public void remoteStatus(final String node, final boolean up, final Object info) {
if (node.equals(data.getNodeName())) {
if (up) {
ErlLogger.debug("Node %s is up", data.getNodeName());
connectRetry();
} else {
ErlLogger.debug("Node %s is down: %s", data.getNodeName(), info);
state = State.DOWN;
}
}
}
};
startLocalNode();
// if (epmdWatcher.isRunningNode(name)) {
// connect();
// }
}
@Override
public void start() {
// TODO Auto-generated method stub
}
public void startLocalNode() {
boolean nodeCreated = false;
synchronized (localNodeLock) {
int i = 0;
do {
try {
i++;
localNode = ErlRuntime.createOtpNode(data.getCookie(), data.hasLongName());
localNode.registerStatusHandler(statusWatcher);
nodeCreated = true;
} catch (final IOException e) {
ErlLogger.error("ErlRuntime could not be created (%s), retrying %d", e.getMessage(), i);
try {
localNodeLock.wait(300);
} catch (final InterruptedException e1) {
}
}
} while (!nodeCreated && i < 10);
}
}
@Override
public String getNodeName() {
return data.getNodeName();
}
private boolean connectRetry() {
int tries = MAX_RETRIES;
boolean ok = false;
while (!ok && tries > 0) {
ErlLogger.debug("# ping..." + getNodeName() + " " + Thread.currentThread().getName());
ok = localNode.ping(getNodeName(), RETRY_DELAY + (MAX_RETRIES - tries) * RETRY_DELAY % 3);
tries--;
}
return ok;
}
@Override
public void async_call_result(
final IRpcResultCallback cb,
final String m,
final String f,
final String signature,
final Object... args)
throws RpcException {
final OtpErlangAtom gleader = new OtpErlangAtom("user");
try {
rpcHelper.rpcCastWithProgress(
cb, localNode, data.getNodeName(), false, gleader, m, f, signature, args);
} catch (final SignatureException e) {
throw new RpcException(e);
}
}
@Override
public IRpcFuture async_call(
final OtpErlangObject gleader,
final String module,
final String fun,
final String signature,
final Object... args0)
throws RpcException {
tryConnect();
try {
return rpcHelper.sendRpcCall(
localNode, data.getNodeName(), false, gleader, module, fun, signature, args0);
} catch (final SignatureException e) {
throw new RpcException(e);
}
}
@Override
public IRpcFuture async_call(
final String module, final String fun, final String signature, final Object... args0)
throws RpcException {
return async_call(new OtpErlangAtom("user"), module, fun, signature, args0);
}
@Override
public void async_call_cb(
final IRpcCallback cb,
final int timeout,
final String module,
final String fun,
final String signature,
final Object... args)
throws RpcException {
async_call_cb(cb, timeout, new OtpErlangAtom("user"), module, fun, signature, args);
}
@Override
public void async_call_cb(
final IRpcCallback cb,
final int timeout,
final OtpErlangObject gleader,
final String module,
final String fun,
final String signature,
final Object... args)
throws RpcException {
tryConnect();
try {
rpcHelper.makeAsyncCbCall(
localNode, data.getNodeName(), cb, timeout, gleader, module, fun, signature, args);
} catch (final SignatureException e) {
throw new RpcException(e);
}
}
@Override
public OtpErlangObject call(
final int timeout,
final OtpErlangObject gleader,
final String module,
final String fun,
final String signature,
final Object... args0)
throws RpcException {
if (stopped) {
return null;
}
tryConnect();
OtpErlangObject result;
try {
result =
rpcHelper.rpcCall(
localNode,
data.getNodeName(),
false,
gleader,
module,
fun,
timeout,
signature,
args0);
} catch (final SignatureException e) {
throw new RpcException(e);
}
return result;
}
@Override
public OtpErlangObject call(
final int timeout,
final String module,
final String fun,
final String signature,
final Object... args0)
throws RpcException {
return call(timeout, new OtpErlangAtom("user"), module, fun, signature, args0);
}
@Override
public void cast(
final OtpErlangObject gleader,
final String module,
final String fun,
final String signature,
final Object... args0)
throws RpcException {
tryConnect();
try {
rpcHelper.rpcCast(
localNode, data.getNodeName(), false, gleader, module, fun, signature, args0);
} catch (final SignatureException e) {
throw new RpcException(e);
}
}
@Override
public void cast(
final String module, final String fun, final String signature, final Object... args0)
throws RpcException {
cast(new OtpErlangAtom("user"), module, fun, signature, args0);
}
private void tryConnect() throws RpcException {
synchronized (connectLock) {
switch (state) {
case DISCONNECTED:
reported = false;
if (connectRetry()) {
state = State.CONNECTED;
} else if (connectOnce) {
state = State.DOWN;
} else {
state = State.DISCONNECTED;
}
break;
case CONNECTED:
break;
case DOWN:
try {
if (process != null) {
process.terminate();
}
} catch (final DebugException e) {
ErlLogger.info(e);
}
// TODO restart it??
// process =
if (!stopped) {
final String msg = reportRuntimeDown(data.getNodeName());
throw new RpcException(msg);
}
}
}
}
private String reportRuntimeDown(final String peer) {
final String fmt = "Backend '%s' is down";
final String msg = String.format(fmt, peer);
if (data.getReportErrors() && !reported) {
final String user = System.getProperty("user.name");
String msg1;
if (connectOnce) {
msg1 =
"It is likely that your network is misconfigured or uses 'strange' host names.\n"
+ "Please check the "
+ "Window->preferences->erlang->network page for hints about that."
+ "\n\n"
+ "Also, check if you can create and connect two erlang nodes on your machine\n"
+ "using \"erl -name foo1\" and \"erl -name foo2\".";
} else {
msg1 =
"If you didn't shut it down on purpose, it is an "
+ "unrecoverable error, please restart Eclipse. ";
}
final String bigMsg =
msg
+ "\n\n"
+ msg1
+ "\n\n"
+ "If an error report named '"
+ user
+ "_<timestamp>.txt' has been created in your home directory,\n "
+ "please consider reporting the problem. \n"
+ (SystemConfiguration.hasFeatureEnabled("erlide.ericsson.user")
? ""
: "http://www.assembla.com/spaces/erlide/support/tickets");
MessageReporter.showError(bigMsg, ReporterPosition.CORNER);
reported = true;
}
return msg;
}
@Override
public boolean isAvailable() {
return state == State.CONNECTED;
}
public static String createJavaNodeName() {
final String fUniqueId = ErlRuntime.getTimeSuffix();
return "jerlide_" + fUniqueId;
}
public static String createJavaNodeName(final String hostName) {
return createJavaNodeName() + "@" + hostName;
}
static String getTimeSuffix() {
String fUniqueId;
fUniqueId = Long.toHexString(System.currentTimeMillis() & 0xFFFFFFF);
return fUniqueId;
}
public static OtpNode createOtpNode(final String cookie, final boolean longName)
throws IOException {
OtpNode node;
final String hostName = HostnameUtils.getErlangHostName(longName);
if (Strings.isNullOrEmpty(cookie)) {
node = new OtpNode(createJavaNodeName(hostName));
} else {
node = new OtpNode(createJavaNodeName(hostName), cookie);
}
debugPrintCookie(node.cookie());
return node;
}
private static void debugPrintCookie(final String cookie) {
final int len = cookie.length();
final String trimmed = len > 7 ? cookie.substring(0, 7) : cookie;
ErlLogger.debug("using cookie '%s...'%d (info: '%s')", trimmed, len, cookie);
}
@Override
public void send(final OtpErlangPid pid, final Object msg) {
try {
tryConnect();
rpcHelper.send(localNode, pid, msg);
} catch (final SignatureException e) {
} catch (final RpcException e) {
}
}
@Override
public void send(final String fullNodeName, final String name, final Object msg) {
try {
tryConnect();
rpcHelper.send(localNode, fullNodeName, name, msg);
} catch (final SignatureException e) {
} catch (final RpcException e) {
}
}
@Override
public OtpMbox createMbox(final String name) {
return localNode.createMbox(name);
}
@Override
public OtpMbox createMbox() {
return localNode.createMbox();
}
@Override
public void stop() {
// close peer too?
stopped = true;
localNode.close();
}
@Override
public RpcResult call_noexception(
final String m, final String f, final String signature, final Object... args) {
return call_noexception(DEFAULT_TIMEOUT, m, f, signature, args);
}
@Override
public RpcResult call_noexception(
final int timeout,
final String m,
final String f,
final String signature,
final Object... args) {
try {
final OtpErlangObject result = call(timeout, m, f, signature, args);
return new RpcResult(result);
} catch (final RpcException e) {
return RpcResult.error(e.getMessage());
}
}
@Override
public void async_call_cb(
final IRpcCallback cb,
final String m,
final String f,
final String signature,
final Object... args)
throws RpcException {
async_call_cb(cb, DEFAULT_TIMEOUT, m, f, signature, args);
}
@Override
public OtpErlangObject call(
final String m, final String f, final String signature, final Object... a)
throws RpcException {
return call(DEFAULT_TIMEOUT, m, f, signature, a);
}
@Override
public void send(final String name, final Object msg) {
try {
tryConnect();
rpcHelper.send(localNode, data.getNodeName(), name, msg);
} catch (final SignatureException e) {
} catch (final RpcException e) {
}
}
@Override
public void connect() {
final String label = getNodeName();
ErlLogger.debug(label + ": waiting connection to peer...");
try {
wait_for_epmd();
eventBox = createMbox("rex");
if (waitForCodeServer()) {
ErlLogger.debug("connected!");
} else {
ErlLogger.error(COULD_NOT_CONNECT_TO_BACKEND);
}
} catch (final BackendException e) {
ErlLogger.error(e);
ErlLogger.error(COULD_NOT_CONNECT_TO_BACKEND);
} catch (final Exception e) {
ErlLogger.error(e);
ErlLogger.error(COULD_NOT_CONNECT_TO_BACKEND);
}
}
private OtpMbox getEventBox() {
return eventBox;
}
@Override
public OtpErlangPid getEventPid() {
final OtpMbox theEventBox = getEventBox();
if (theEventBox == null) {
return null;
}
return theEventBox.self();
}
private void wait_for_epmd() throws BackendException {
wait_for_epmd("localhost");
}
private void wait_for_epmd(final String host) throws BackendException {
// If anyone has a better solution for waiting for epmd to be up, please
// let me know
int tries = 50;
boolean ok = false;
do {
Socket s;
try {
s = new Socket(host, EPMD_PORT);
s.close();
ok = true;
} catch (final IOException e) {
}
try {
Thread.sleep(100);
// ErlLogger.debug("sleep............");
} catch (final InterruptedException e1) {
}
tries--;
} while (!ok && tries > 0);
if (!ok) {
final String msg =
"Couldn't contact epmd - erlang backend is probably not working\n"
+ " Possibly your host's entry in /etc/hosts is wrong ("
+ host
+ ").";
ErlLogger.error(msg);
throw new BackendException(msg);
}
}
private boolean waitForCodeServer() {
try {
OtpErlangObject r;
int i = 30;
boolean gotIt = false;
do {
r = call("erlang", "whereis", "a", "code_server");
gotIt = !(r instanceof OtpErlangPid);
if (!gotIt) {
try {
Thread.sleep(200);
} catch (final InterruptedException e) {
}
}
i--;
} while (gotIt && i > 0);
if (gotIt) {
ErlLogger.error("code server did not start in time for %s", getNodeName());
return false;
}
ErlLogger.debug("code server started");
return true;
} catch (final Exception e) {
ErlLogger.error("error starting code server for %s: %s", getNodeName(), e.getMessage());
return false;
}
}
private static void setDefaultTimeout() {
final String t = System.getProperty("erlide.rpc.timeout", "9000");
if ("infinity".equals(t)) {
DEFAULT_TIMEOUT = RpcHelper.INFINITY;
} else {
try {
DEFAULT_TIMEOUT = Integer.parseInt(t);
} catch (final Exception e) {
DEFAULT_TIMEOUT = 9000;
}
}
}
@Override
public boolean isStopped() {
return stopped || !isAvailable();
}
@Override
public OtpMbox getEventMbox() {
return eventBox;
}
@Override
public IRpcSite getRpcSite() {
return this;
}
@Override
public RuntimeData getRuntimeData() {
return data;
}
@Override
public RuntimeInfo getRuntimeInfo() {
return data.getRuntimeInfo();
}
}
