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package com.fasterxml.clustermate.client;
import java.io.File;
import java.util.*;
import java.util.concurrent.atomic.AtomicBoolean;
import com.fasterxml.clustermate.api.*;
import com.fasterxml.clustermate.api.msg.ListItem;
import com.fasterxml.clustermate.api.msg.ListResponse;
import com.fasterxml.clustermate.client.call.*;
import com.fasterxml.clustermate.client.operation.*;
import com.fasterxml.clustermate.client.util.GenericContentConverter;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.storemate.shared.ByteRange;
import com.fasterxml.storemate.shared.util.ByteAggregator;
/**
* Client used for accessing temporary store service.
*/
public abstract class StoreClient,
L extends ListItem
>
extends Loggable
{
/**
* Let's use Chunked Transfer-Encoding for larger payloads; cut-off
* point is arbitrary, choose nice round number of 64k.
*/
protected final static long MIN_LENGTH_FOR_CHUNKED = 64 * 1024;
/*
/**********************************************************************
/* Configuration
/**********************************************************************
*/
protected final CONFIG _config;
/*
/**********************************************************************
/* Helper objects, HTTP
/**********************************************************************
*/
protected final NetworkClient _httpClient;
/*
/**********************************************************************
/* Helper objects, other
/**********************************************************************
*/
protected final ClusterStatusAccessor _statusAccessor;
protected EntryKeyConverter _keyConverter;
protected final EnumMap> _listReaders;
/*
/**********************************************************************
/* Life-cycle
/**********************************************************************
*/
/**
* Processing thread used for maintaining cluster state information.
*/
protected Thread _thread;
protected final AtomicBoolean _stopRequested = new AtomicBoolean(false);
/*
/**********************************************************************
/* State
/**********************************************************************
*/
protected final ClusterViewByClient _clusterView;
/*
/**********************************************************************
/* Life-cycle
/**********************************************************************
*/
/**
* @param config Client configuration to use
* @param listItemType Concrete {@link ListItem} type for implementation
*/
protected StoreClient(CONFIG config, Class listItemType,
ClusterStatusAccessor statusAccessor, ClusterViewByClient clusterView,
NetworkClient httpClientImpl)
{
super(StoreClient.class);
_config = config;
_keyConverter = config.getKeyConverter();
_httpClient = httpClientImpl;
_statusAccessor = statusAccessor;
_clusterView = clusterView;
_listReaders = new EnumMap>(ListItemType.class);
ObjectMapper mapper = config.getJsonMapper();
_listReaders.put(ListItemType.ids, new GenericContentConverter(mapper, ListResponse.IdListResponse.class));
_listReaders.put(ListItemType.names, new GenericContentConverter(mapper, ListResponse.NameListResponse.class));
_listReaders.put(ListItemType.minimalEntries,
new GenericContentConverter(mapper,
ListResponse.MinimalItemListResponse.class));
/* "full" ListItemType is trickier, since we need to use generic type definition
* to parameterize appropriate Full
*/
// Ugh. Jackson's type resolution fails if using "FullItemListResponse"... need to work around it
JavaType fullResponseType = config.getJsonMapper().getTypeFactory().constructParametricType(
ListResponse.class, listItemType);
_listReaders.put(ListItemType.fullEntries,
new GenericContentConverter>(mapper, fullResponseType));
}
/**
* Method called by {@link StoreClientBootstrapper} once bootstrapping
* is complete to some degree.
*/
protected synchronized void start()
{
if (_thread != null) {
throw new IllegalStateException("Trying to call start() more than once");
}
_stopRequested.set(false);
Thread t = new Thread(new Runnable() {
@Override public void run() {
updateLoop();
}
});
// make it daemon, so as not to block shutdowns
t.setDaemon(runAsDaemon());
_thread = t;
t.start();
}
/**
* Method that must be called to stop processing thread client has
*/
public void stop()
{
_stopRequested.set(true);
Thread t = _thread;
if (t != null) {
t.interrupt();
}
// Should we ask HTTP Client to shut down here, or within thread?
_httpClient.shutdown();
// _blockingHttpClient.getConnectionManager().shutdown();
}
public synchronized boolean isRunning() {
return (_thread != null);
}
public boolean hasStopBeenRequested() {
return _stopRequested.get();
}
/*
/**********************************************************************
/* Simple accessors
/**********************************************************************
*/
/**
* Accessor for getting full cluster information
*/
public ClusterViewByClient getCluster() {
return _clusterView;
}
public EntryKeyConverter getKeyConverter() {
return _keyConverter;
}
/**
* Overridable internal accessor to define whether background thread used
* for updates is to run as daemon or not; usually it should (and by default
* does)
*/
public boolean runAsDaemon() {
return true;
}
/*
/**********************************************************************
/* Main update loop used for keeping up to date with Cluster Status
/**********************************************************************
*/
/**
* Method that keeps on calling {@link #updateOnce} until Client is
* requested to stop its operation.
*/
protected void updateLoop()
{
try {
while (!_stopRequested.get()) {
final long startTime = System.currentTimeMillis();
// throttle amount of work...
final long nextCall = startTime + StoreClientConfig.MIN_DELAY_BETWEEN_STATUS_CALLS_MSECS;
try {
updateOnce();
} catch (Exception e) {
logWarn(e, "Problem during Client updateLoop: "+e.getMessage());
}
long delay = nextCall - System.currentTimeMillis();
if (delay > 0) {
try {
Thread.sleep(delay);
} catch (InterruptedException e) { }
}
}
} finally {
// after done, let's clear thread reference...
synchronized (this) {
_thread = null;
}
}
}
/**
* Method that tries to update state of cluster by making a single call
* to "most deserving" server node.
*/
protected void updateOnce() throws Exception
{
// !!! TODO:
// (1) Figure out which server node to call (least recently called one with updates etc)
}
/*
/**********************************************************************
/* Client API: convenience wrappers for PUTs
/**********************************************************************
*/
/**
* Convenience method for PUTting specified static content;
* may be used if content need not be streamed from other sources.
*/
public final PutOperationResult putContent(PutCallParameters params, K key, byte[] data)
throws InterruptedException
{
return putContent(params, key, data, 0, data.length);
}
/**
* Convenience method for PUTting specified static content;
* may be used if content need not be streamed from other sources.
*/
public final PutOperationResult putContent(PutCallParameters params, K key,
byte[] data, int dataOffset, int dataLength)
throws InterruptedException
{
return putContent(params, key, PutContentProviders.forBytes(data, dataOffset, dataLength));
}
/**
* Convenience method for PUTting contents of specified File.
*/
public final PutOperationResult putContent(PutCallParameters params, K key, File file)
throws InterruptedException {
return putContent(params, key, PutContentProviders.forFile(file, file.length()));
}
/*
/**********************************************************************
/* Client API: convenience wrappers for GETs
/**********************************************************************
*/
/**
* Convenience method for GETting specific content and aggregating it as a
* byte array.
* Note that failure to perform GET operation will be signaled with
* {@link IllegalStateException}, whereas missing content is indicated by
* null return value.
*
* @return Array of bytes returned, if content exists; null if no such content
* exists (never PUT, or has been DELETEd)
*/
public byte[] getContentAsBytes(ReadCallParameters params, K key)
throws InterruptedException
{
GetContentProcessorForBytes processor = new GetContentProcessorForBytes();
GetOperationResult result = getContent(params, key, processor);
if (result.failed()) { // failed to contact any server
_handleGetFailure(params, key, result);
}
// otherwise, we either got content, or got 404 or deletion
ByteAggregator aggr = result.getContents();
return (aggr == null) ? null : aggr.toByteArray();
}
/**
* Convenience method for GETting specific content and storing it in specified file.
* Note that failure to perform GET operation will be signaled with
* {@link IllegalStateException}, whereas missing content is indicated by
* 'false' return value
*
* @return Original result file, if content exists; null if content was not found but
* operation succeeded (throw exception if access operation itself fails)
*/
public final File getContentAsFile(ReadCallParameters params, K key, File resultFile)
throws InterruptedException
{
GetContentProcessorForFiles processor = new GetContentProcessorForFiles(resultFile);
GetOperationResult result = getContent(params, key, processor);
if (result.failed()) { // failed to contact any server
_handleGetFailure(params, key, result);
}
// otherwise, we either got content, or got 404 or deletion -- latter means we return null:
return result.getContents();
}
/**
* Convenience method for GETting part of specified resource
* aggregated as a byte array.
*
* Note that failure to perform GET operation will be signaled with
* {@link IllegalStateException}, whereas missing content is indicated by
* null return value.
*
* Note that when accessing ranges, content will always be return uncompressed
* (if server compressed it, or received pre-compressed content declared with
* compression type).
*
* @param range Specified byte range to access, using offsets in uncompressed content
*
* @return Array of bytes returned, if content exists; null if no such content
* exists (never PUT, or has been DELETEd)
*/
public final byte[] getPartialContentAsBytes(ReadCallParameters params, K key, ByteRange range)
throws InterruptedException
{
GetContentProcessorForBytes processor = new GetContentProcessorForBytes();
GetOperationResult result = getContent(params, key, processor, range);
if (result.failed()) { // failed to contact any server
_handleGetFailure(params, key, result);
}
// otherwise, we either got content, or got 404 or deletion
ByteAggregator aggr = result.getContents();
return (aggr == null) ? null : aggr.toByteArray();
}
/**
* Convenience method for GETting part of specified resource
* stored as specified file (if existing, will be overwritten).
*
* Note that failure to perform GET operation will be signaled with
* {@link IllegalStateException}, whereas missing content is indicated by
* null return value.
*
* Note that when accessing ranges, content will always be return uncompressed
* (if server compressed it, or received pre-compressed content declared with
* compression type).
*
* @param range Specified byte range to access, using offsets in uncompressed content
*
* @return Original result file, if content exists; null if content was not found but
* operation succeeded (throw exception if access operation itself fails)
*/
public final File getPartialContentAsFile(ReadCallParameters params, K key, File resultFile,
ByteRange range) throws InterruptedException
{
GetContentProcessorForFiles processor = new GetContentProcessorForFiles(resultFile);
GetOperationResult result = getContent(params, key, processor, range);
if (result.failed()) { // failed to contact any server
_handleGetFailure(params, key, result);
}
// otherwise, we either got content, or got 404 or deletion -- latter means we return null:
return result.getContents();
}
/**
* Convenience method for making HEAD request to figure out length of
* the resource, if one exists (and -1 if not).
*
* @return Length of entry in bytes, if entry exists: -1 if no such entry
* exists
*/
public final long getContentLength(ReadCallParameters params, K key)
throws InterruptedException
{
HeadOperationResult result = headContent(params, key);
if (result.failed()) { // failed to contact any server
NodeFailure nodeFail = result.getFirstFail();
if (nodeFail != null) {
CallFailure callFail = nodeFail.getFirstCallFailure();
if (callFail != null) {
Throwable t = callFail.getCause();
if (t != null) {
throw new IllegalStateException("Failed to HEAD resource '"+key+"': tried and failed to access "
+result.getFailCount()+" server nodes; first failure due to: "+t);
}
}
}
throw new IllegalStateException("Failed to HEAD resource '"+key+"': tried and failed to access "
+result.getFailCount()+" server nodes; first problem: "+result.getFirstFail());
}
return result.getContentLength();
}
protected void _handleGetFailure(ReadCallParameters params, K key, GetOperationResult result)
{
NodeFailure nodeFail = result.getFirstFail();
if (nodeFail != null) {
CallFailure callFail = nodeFail.getFirstCallFailure();
if (callFail != null) {
Throwable t = callFail.getCause();
if (t != null) {
throw new IllegalStateException("Failed to GET resource '"+key+"': tried and failed to access "
+result.getFailCount()+" server nodes; first failure due to: "+t);
}
}
}
throw new IllegalStateException("Failed to GET resource '"+key+"': tried and failed to access "
+result.getFailCount()+" server nodes; first problem: "+result.getFirstFail());
}
/*
/**********************************************************************
/* Client API, low-level operations: PUT
/**********************************************************************
*/
/**
* Method called to PUT specified content into appropriate server nodes.
*
* @return Result object that indicates state of the operation as whole,
* including information on servers that were accessed during operation.
* Caller is expected to check details from this object to determine
* whether operation was successful or not.
*/
public PutOperationResult putContent(PutCallParameters params, K key, PutContentProvider content)
throws InterruptedException
{
try {
return _putContent(params, key, content);
} finally {
content.release();
}
}
protected PutOperationResult _putContent(PutCallParameters params, K key, PutContentProvider content)
throws InterruptedException
{
final long startTime = System.currentTimeMillis();
final CONFIG config = _getConfig(params);
// First things first: find Server nodes to talk to:
NodesForKey nodes = _clusterView.getNodesFor(key);
PutOperationResult result = new PutOperationResult(config.getOperationConfig(), params);
// One sanity check: if not enough server nodes to talk to, can't succeed...
int nodeCount = nodes.size();
// should this actually result in an exception?
if (nodeCount < config.getOperationConfig().getMinimalOksToSucceed()) {
return result;
}
// Then figure out how long we have for the whole operation
final long endOfTime = startTime + config.getOperationConfig().getGetOperationTimeoutMsecs();
final long lastValidTime = endOfTime - config.getCallConfig().getMinimumTimeoutMsecs();
/* Ok: first round; try PUT into every enabled store, up to optimal number
* of successes we expect.
*/
final boolean noRetries = !allowRetries(config);
List retries = null;
for (int i = 0; i < nodeCount; ++i) {
ClusterServerNode server = nodes.node(i);
if (server.isDisabled() && !noRetries) { // can skip disabled, iff retries allowed
break;
}
CallFailure fail = server.entryPutter().tryPut(config.getCallConfig(), params, endOfTime, key, content);
if (fail != null) { // only add to retry-list if something retry may help with
if (fail.isRetriable()) {
retries = _add(retries, new NodeFailure(server, fail));
} else {
result.withFailed(new NodeFailure(server, fail));
}
continue;
}
result.addSucceeded(server);
// Very first round: go up to max if it's smooth sailing!
if (result.succeededMaximally()) {
return result.withFailed(retries);
}
}
if (noRetries) { // if we can't retry, don't:
return result.withFailed(retries);
}
// If we got this far, let's accept sub-optimal outcomes as well; or, if we timed out
final long secondRoundStart = System.currentTimeMillis();
if (result.succeededMinimally() || secondRoundStart >= lastValidTime) {
return result.withFailed(retries);
}
// Do we need any delay in between?
_doDelay(startTime, secondRoundStart, endOfTime);
// Otherwise: go over retry list first, and if that's not enough, try disabled
if (retries == null) {
retries = new LinkedList();
} else {
Iterator it = retries.iterator();
while (it.hasNext()) {
NodeFailure retry = it.next();
ClusterServerNode server = (ClusterServerNode) retry.getServer();
CallFailure fail = server.entryPutter().tryPut(config.getCallConfig(), params, endOfTime, key, content);
if (fail != null) {
retry.addFailure(fail);
if (!fail.isRetriable()) { // not worth retrying?
result.withFailed(retry);
it.remove();
}
} else {
it.remove(); // remove now from retry list
result.addSucceeded(server);
if (result.succeededOptimally()) {
return result.withFailed(retries);
}
}
}
}
// if no success, add disabled nodes in the mix; but only if we don't have minimal success:
for (int i = 0; i < nodeCount; ++i) {
if (result.succeededMinimally() || System.currentTimeMillis() >= lastValidTime) {
return result.withFailed(retries);
}
ClusterServerNode server = nodes.node(i);
if (server.isDisabled()) {
CallFailure fail = server.entryPutter().tryPut(config.getCallConfig(),
params, endOfTime, key, content);
if (fail != null) {
if (fail.isRetriable()) {
retries.add(new NodeFailure(server, fail));
} else {
result.withFailed(new NodeFailure(server, fail));
}
} else {
result.addSucceeded(server);
}
}
}
// But from now on, keep on retrying, up to... N times (start with 1, as we did first retry)
long prevStartTime = secondRoundStart;
for (int i = 1; (i <= StoreClientConfig.MAX_RETRIES_FOR_PUT) && !retries.isEmpty(); ++i) {
final long currStartTime = System.currentTimeMillis();
_doDelay(prevStartTime, currStartTime, endOfTime);
// and off we go again...
Iterator it = retries.iterator();
while (it.hasNext()) {
if (result.succeededMinimally() || System.currentTimeMillis() >= lastValidTime) {
return result.withFailed(retries);
}
NodeFailure retry = it.next();
ClusterServerNode server = (ClusterServerNode) retry.getServer();
CallFailure fail = server.entryPutter().tryPut(config.getCallConfig(),
params, endOfTime, key, content);
if (fail != null) {
retry.addFailure(fail);
if (!fail.isRetriable()) {
result.withFailed(retry);
it.remove();
}
} else {
result.addSucceeded(server);
}
}
prevStartTime = currStartTime;
}
// we are all done, failed:
return result.withFailed(retries);
}
/*
/**********************************************************************
/* Actual Client API, low-level operations: GET.
/* NOTE: division between streaming (incremental), full-read is ugly,
/* but somewhat necessary for efficient operation
/**********************************************************************
*/
/**
* Method called to GET specified content from an appropriate server node,
* and to pass it to specified processor for actual handling such as
* aggregating or writing to an output stream.
*
* NOTE: definition of "success" for result object is whether operation succeeded
* in finding entry iff one exists -- but if entry did not exist, operation may
* still succeed. To check whether entry was fetched, you will need to use
* {@link GetOperationResult#entryFound()}.
*
* @return Result object that indicates state of the operation as whole,
* including information on servers that were accessed during operation.
* Caller is expected to check details from this object to determine
* whether operation was successful or not.
*/
public final GetOperationResult getContent(ReadCallParameters params,
K key, GetContentProcessor processor)
throws InterruptedException
{
return getContent(params, key, processor, null);
}
public GetOperationResult getContent(ReadCallParameters params,
K key, GetContentProcessor processor, ByteRange range)
throws InterruptedException
{
final long startTime = System.currentTimeMillis();
final CONFIG config = _getConfig(params);
// First things first: find Server nodes to talk to:
NodesForKey nodes = _clusterView.getNodesFor(key);
// then result
GetOperationResult result = new GetOperationResult(config.getOperationConfig());
// One sanity check: if not enough server nodes to talk to, can't succeed...
int nodeCount = nodes.size();
if (nodeCount < 1) {
return result; // or Exception?
}
// Then figure out how long we have for the whole operation
final long endOfTime = startTime + config.getOperationConfig().getGetOperationTimeoutMsecs();
final long lastValidTime = endOfTime - config.getCallConfig().getMinimumTimeoutMsecs();
// Ok: first round; try GET from every enabled store
final boolean noRetries = !allowRetries(config);
List retries = null;
for (int i = 0; i < nodeCount; ++i) {
ClusterServerNode server = nodes.node(i);
if (!server.isDisabled() || noRetries) {
GetCallResult gotten = server.entryGetter().tryGet(config.getCallConfig(),
params, endOfTime, key, processor, range);
if (gotten.failed()) {
CallFailure fail = gotten.getFailure();
if (fail.isRetriable()) {
retries = _add(retries, new NodeFailure(server, fail));
} else {
result.withFailed(new NodeFailure(server, fail));
}
continue;
}
// did we get the thing?
T entry = gotten.getResult();
if (entry != null) {
return result.withFailed(retries).setContents(server, entry);
}
// it not, it's 404, missing entry. Neither fail nor really success...
result = result.withMissing(server);
}
}
if (noRetries) { // if we can't retry, don't:
return result.withFailed(retries);
}
final long secondRoundStart = System.currentTimeMillis();
// Do we need any delay in between?
_doDelay(startTime, secondRoundStart, endOfTime);
// Otherwise: go over retry list first, and if that's not enough, try disabled
if (retries == null) {
retries = new LinkedList();
} else {
Iterator it = retries.iterator();
while (it.hasNext()) {
NodeFailure retry = it.next();
ClusterServerNode server = (ClusterServerNode) retry.getServer();
GetCallResult gotten = server.entryGetter().tryGet(config.getCallConfig(),
params, endOfTime, key, processor, range);
if (gotten.succeeded()) {
T entry = gotten.getResult(); // got it?
if (entry != null) {
return result.withFailed(retries).setContents(server, entry);
}
// it not, it's 404, missing entry. Neither fail nor really success...
result = result.withMissing(server);
it.remove();
} else {
CallFailure fail = gotten.getFailure();
retry.addFailure(fail);
if (!fail.isRetriable()) {
result.withFailed(retry);
it.remove();
}
}
}
}
// if no success, add disabled nodes in the mix
for (int i = 0; i < nodeCount; ++i) {
ClusterServerNode server = nodes.node(i);
if (server.isDisabled()) {
if (System.currentTimeMillis() >= lastValidTime) {
return result.withFailed(retries);
}
GetCallResult gotten = server.entryGetter().tryGet(config.getCallConfig(),
params, endOfTime, key, processor, range);
if (gotten.succeeded()) {
T entry = gotten.getResult(); // got it?
if (entry != null) {
return result.withFailed(retries).setContents(server, entry);
}
// it not, it's 404, missing entry. Neither fail nor really success...
result = result.withMissing(server);
} else {
CallFailure fail = gotten.getFailure();
if (fail.isRetriable()) {
retries.add(new NodeFailure(server, fail));
} else {
result.withFailed(new NodeFailure(server, fail));
}
}
}
}
long prevStartTime = secondRoundStart;
for (int i = 1; (i <= StoreClientConfig.MAX_RETRIES_FOR_GET) && !retries.isEmpty(); ++i) {
final long currStartTime = System.currentTimeMillis();
_doDelay(prevStartTime, currStartTime, endOfTime);
Iterator it = retries.iterator();
while (it.hasNext()) {
if (System.currentTimeMillis() >= lastValidTime) {
return result.withFailed(retries);
}
NodeFailure retry = it.next();
ClusterServerNode server = (ClusterServerNode) retry.getServer();
GetCallResult gotten = server.entryGetter().tryGet(config.getCallConfig(),
params, endOfTime, key, processor, range);
if (gotten.succeeded()) {
T entry = gotten.getResult(); // got it?
if (entry != null) {
return result.withFailed(retries).setContents(server, entry);
}
// it not, it's 404, missing entry. Neither fail nor really success...
result = result.withMissing(server);
it.remove();
} else {
CallFailure fail = gotten.getFailure();
retry.addFailure(fail);
if (!fail.isRetriable()) {
result.withFailed(retry);
it.remove();
}
}
}
}
// we are all done and this'll be a failure...
return result.withFailed(retries);
}
/*
/**********************************************************************
/* Actual Client API, low-level operations: HEAD
/**********************************************************************
*/
public HeadOperationResult headContent(ReadCallParameters params, K key)
throws InterruptedException
{
final long startTime = System.currentTimeMillis();
final CONFIG config = _getConfig(params);
// First things first: find Server nodes to talk to:
NodesForKey nodes = _clusterView.getNodesFor(key);
// then result
HeadOperationResult result = new HeadOperationResult(config.getOperationConfig());
// One sanity check: if not enough server nodes to talk to, can't succeed...
int nodeCount = nodes.size();
if (nodeCount < 1) {
return result; // or Exception?
}
// Then figure out how long we have for the whole operation; use same timeout as GET
final long endOfTime = startTime + config.getOperationConfig().getGetOperationTimeoutMsecs();
final long lastValidTime = endOfTime - config.getCallConfig().getMinimumTimeoutMsecs();
// Ok: first round; try HEAD from every enabled store (or, if only one try, all)
final boolean noRetries = !allowRetries(config);
List retries = null;
for (int i = 0; i < nodeCount; ++i) {
ClusterServerNode server = nodes.node(i);
if (!server.isDisabled() || noRetries) {
HeadCallResult gotten = server.entryHeader().tryHead(config.getCallConfig(),
params, endOfTime, key);
if (gotten.failed()) {
CallFailure fail = gotten.getFailure();
if (fail.isRetriable()) {
retries = _add(retries, new NodeFailure(server, fail));
} else {
result.withFailed(new NodeFailure(server, fail));
}
continue;
}
if (gotten.hasContentLength()) {
return result.withFailed(retries).setContentLength(server, gotten.getContentLength());
}
// it not, it's 404, missing entry. Neither fail nor really success...
result = result.withMissing(server);
}
}
if (noRetries) { // if no retries, bail out quickly
return result.withFailed(retries);
}
final long secondRoundStart = System.currentTimeMillis();
// Do we need any delay in between?
_doDelay(startTime, secondRoundStart, endOfTime);
// Otherwise: go over retry list first, and if that's not enough, try disabled
if (retries == null) {
retries = new LinkedList();
} else {
Iterator it = retries.iterator();
while (it.hasNext()) {
NodeFailure retry = it.next();
ClusterServerNode server = (ClusterServerNode) retry.getServer();
HeadCallResult gotten = server.entryHeader().tryHead(config.getCallConfig(),
params, endOfTime, key);
if (gotten.succeeded()) {
if (gotten.hasContentLength()) {
return result.withFailed(retries).setContentLength(server, gotten.getContentLength());
}
// it not, it's 404, missing entry. Neither fail nor really success...
result = result.withMissing(server);
it.remove();
} else {
CallFailure fail = gotten.getFailure();
retry.addFailure(fail);
if (!fail.isRetriable()) {
result.withFailed(retry);
it.remove();
}
}
}
}
// if no success, add disabled nodes in the mix; try only once per each
for (int i = 0; i < nodeCount; ++i) {
ClusterServerNode server = nodes.node(i);
if (server.isDisabled()) {
if (System.currentTimeMillis() >= lastValidTime) {
return result.withFailed(retries);
}
HeadCallResult gotten = server.entryHeader().tryHead(config.getCallConfig(),
params, endOfTime, key);
if (gotten.succeeded()) {
if (gotten.hasContentLength()) {
return result.withFailed(retries).setContentLength(server, gotten.getContentLength());
}
// it not, it's 404, missing entry. Neither fail nor really success...
result = result.withMissing(server);
} else {
CallFailure fail = gotten.getFailure();
if (fail.isRetriable()) {
retries.add(new NodeFailure(server, fail));
} else {
result.withFailed(new NodeFailure(server, fail));
}
}
}
}
long prevStartTime = secondRoundStart;
for (int i = 1; (i <= StoreClientConfig.MAX_RETRIES_FOR_GET) && !retries.isEmpty(); ++i) {
final long currStartTime = System.currentTimeMillis();
_doDelay(prevStartTime, currStartTime, endOfTime);
Iterator it = retries.iterator();
while (it.hasNext()) {
if (System.currentTimeMillis() >= lastValidTime) {
return result.withFailed(retries);
}
NodeFailure retry = it.next();
ClusterServerNode server = (ClusterServerNode) retry.getServer();
HeadCallResult gotten = server.entryHeader().tryHead(config.getCallConfig(),
params, endOfTime, key);
if (gotten.succeeded()) {
if (gotten.hasContentLength()) {
return result.withFailed(retries).setContentLength(server, gotten.getContentLength());
}
// it not, it's 404, missing entry. Neither fail nor really success...
result = result.withMissing(server);
it.remove();
} else {
CallFailure fail = gotten.getFailure();
retry.addFailure(fail);
if (!fail.isRetriable()) {
result.withFailed(retry);
it.remove();
}
}
}
}
// we are all done and this'll be a failure...
return result.withFailed(retries);
}
/*
/**********************************************************************
/* Actual Client API, low-level operations: List entry ids, metadata
/**********************************************************************
*/
/**
* Method called to start iterating over entries with given key prefix.
* Result object is basically an iterator, and no actual access occurs
* before methods are called on iterator.
*/
public StoreEntryLister listContent(ReadCallParameters params, K prefix, ListItemType itemType)
throws InterruptedException
{
if (itemType == null) {
throw new IllegalArgumentException("Can't pass null itemType");
}
@SuppressWarnings("unchecked")
GenericContentConverter> converter = (GenericContentConverter>) _listReaders.get(itemType);
if (converter == null) { // sanity check, should never occur
throw new IllegalArgumentException("Unsupported item type: "+itemType);
}
final CONFIG config = _getConfig(params);
return new StoreEntryLister(config, _clusterView, prefix, itemType, converter, null);
}
/*
/**********************************************************************
/* Actual Client API, low-level operations: DELETE
/**********************************************************************
*/
/**
* Method called to DELETE specified content from appropriate server nodes.
*
* @return Result object that indicates state of the operation as whole,
* including information on servers that were accessed during operation.
* Caller is expected to check details from this object to determine
* whether operation was successful or not.
*/
public DeleteOperationResult deleteContent(DeleteCallParameters params, K key)
throws InterruptedException
{
final long startTime = System.currentTimeMillis();
final CONFIG config = _getConfig(params);
// First things first: find Server nodes to talk to:
NodesForKey nodes = _clusterView.getNodesFor(key);
DeleteOperationResult result = new DeleteOperationResult(config.getOperationConfig());
// One sanity check: if not enough server nodes to talk to, can't succeed...
int nodeCount = nodes.size();
if (nodeCount < config.getOperationConfig().getMinimalOksToSucceed()) {
return result; // or Exception?
}
// Then figure out how long we have for the whole operation
final long endOfTime = startTime + config.getOperationConfig().getGetOperationTimeoutMsecs();
final long lastValidTime = endOfTime - config.getCallConfig().getMinimumTimeoutMsecs();
/* Ok: first round; try DETE from every enabled store, up to optimal number
* of successes we expect.
*/
final boolean noRetries = !allowRetries(config);
List retries = null;
for (int i = 0; i < nodeCount; ++i) {
ClusterServerNode server = nodes.node(i);
if (server.isDisabled() && !noRetries) { // should be able to break, but let's double check
break;
}
CallFailure fail = server.entryDeleter().tryDelete(config.getCallConfig(),
params, endOfTime, key);
if (fail != null) {
if (fail.isRetriable()) {
retries = _add(retries, new NodeFailure(server, fail));
} else {
result.withFailed(new NodeFailure(server, fail));
}
continue;
}
result.addSucceeded(server);
// first round: go to the max, if possible
if (result.succeededMaximally()) {
return result.withFailed(retries);
}
}
if (noRetries) { // if no retries, bail out quickly
return result.withFailed(retries);
}
/* If we got this far, let's accept 'just optimal'; but keep on trying for
* optimal since deletion via expiration is much more costly than explicit
* DELETEs.
*/
final long secondRoundStart = System.currentTimeMillis();
if (result.succeededOptimally() || secondRoundStart >= lastValidTime) {
return result.withFailed(retries);
}
// Do we need any delay in between?
_doDelay(startTime, secondRoundStart, endOfTime);
// Otherwise: go over retry list first, and if that's not enough, try disabled
if (retries == null) {
retries = new LinkedList();
} else {
Iterator it = retries.iterator();
while (it.hasNext()) {
NodeFailure retry = it.next();
ClusterServerNode server = (ClusterServerNode) retry.getServer();
CallFailure fail = server.entryDeleter().tryDelete(config.getCallConfig(),
params, endOfTime, key);
if (fail != null) {
retry.addFailure(fail);
if (!fail.isRetriable()) { // not worth retrying?
result.withFailed(retry);
it.remove();
}
} else {
it.remove(); // remove now from retry list
result.addSucceeded(server);
if (result.succeededOptimally()) {
return result.withFailed(retries);
}
}
}
}
// if no success, add disabled nodes in the mix; but only if we don't have minimal success:
for (int i = 0; i < nodeCount; ++i) {
if (result.succeededMinimally() || System.currentTimeMillis() >= lastValidTime) {
return result.withFailed(retries);
}
ClusterServerNode server = nodes.node(i);
if (server.isDisabled()) {
CallFailure fail = server.entryDeleter().tryDelete(config.getCallConfig(),
params, endOfTime, key);
if (fail != null) {
if (fail.isRetriable()) {
retries.add(new NodeFailure(server, fail));
} else {
result.withFailed(new NodeFailure(server, fail));
}
} else {
result.addSucceeded(server);
}
}
}
long prevStartTime = secondRoundStart;
for (int i = 1; (i <= StoreClientConfig.MAX_RETRIES_FOR_DELETE) && !retries.isEmpty(); ++i) {
final long currStartTime = System.currentTimeMillis();
_doDelay(prevStartTime, currStartTime, endOfTime);
// and off we go again...
Iterator it = retries.iterator();
while (it.hasNext()) {
if (result.succeededMinimally() || System.currentTimeMillis() >= lastValidTime) {
return result.withFailed(retries);
}
NodeFailure retry = it.next();
ClusterServerNode server = retry.getServer();
CallFailure fail = server.entryDeleter().tryDelete(config.getCallConfig(),
params, endOfTime, key);
if (fail != null) {
retry.addFailure(fail);
if (!fail.isRetriable()) {
result.withFailed(retry);
it.remove();
}
} else {
result.addSucceeded(server);
}
}
prevStartTime = currStartTime;
}
// we are all done, failed:
return result.withFailed(retries);
}
/*
/**********************************************************************
/* Helper methods
/**********************************************************************
*/
@SuppressWarnings("unchecked")
protected CONFIG _getConfig(CallParameters callParams)
{
if (callParams != null) {
CONFIG cfg = (CONFIG) callParams.getClientConfig();
if (cfg != null) {
return cfg;
}
}
return _config;
}
protected boolean allowRetries(CONFIG config) {
return config.getOperationConfig().getAllowRetries();
}
protected List _add(List list, T entry)
{
if (list == null) {
list = new LinkedList();
}
list.add(entry);
return list;
}
protected void _doDelay(long startTime, long currTime, long endTime)
throws InterruptedException
{
long timeSpent = currTime - startTime;
// only add delay if we have had quick failures (signaling overload)
if (timeSpent < 1000L) {
long timeLeft = endTime - currTime;
// also, only wait if we still have some time; and then modest amount (250 mecs)
if (timeLeft >= (4 * StoreClientConfig.DELAY_BETWEEN_RETRY_ROUNDS_MSECS)) {
Thread.sleep(StoreClientConfig.DELAY_BETWEEN_RETRY_ROUNDS_MSECS);
}
}
}
}