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Posted to commits@hbase.apache.org by gi...@apache.org on 2017/08/10 15:06:37 UTC
[30/46] hbase-site git commit: Published site at
82d554e3783372cc6b05489452c815b57c06f6cd.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/47be635d/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncScanSingleRegionRpcRetryingCaller.ScanResumerImpl.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncScanSingleRegionRpcRetryingCaller.ScanResumerImpl.html b/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncScanSingleRegionRpcRetryingCaller.ScanResumerImpl.html
index c21aec6..0362d7f 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncScanSingleRegionRpcRetryingCaller.ScanResumerImpl.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/client/AsyncScanSingleRegionRpcRetryingCaller.ScanResumerImpl.html
@@ -61,516 +61,530 @@
<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.exceptions.ScannerResetException;<a name="line.53"></a>
<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.ipc.HBaseRpcController;<a name="line.54"></a>
<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.regionserver.RegionServerStoppedException;<a name="line.55"></a>
-<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter;<a name="line.56"></a>
-<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.shaded.protobuf.ResponseConverter;<a name="line.57"></a>
-<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ClientService;<a name="line.58"></a>
-<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ClientService.Interface;<a name="line.59"></a>
-<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ScanRequest;<a name="line.60"></a>
-<span class="sourceLineNo">061</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ScanResponse;<a name="line.61"></a>
-<span class="sourceLineNo">062</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.62"></a>
-<span class="sourceLineNo">063</span><a name="line.63"></a>
-<span class="sourceLineNo">064</span>/**<a name="line.64"></a>
-<span class="sourceLineNo">065</span> * Retry caller for scanning a region.<a name="line.65"></a>
-<span class="sourceLineNo">066</span> * <p><a name="line.66"></a>
-<span class="sourceLineNo">067</span> * We will modify the {@link Scan} object passed in directly. The upper layer should store the<a name="line.67"></a>
-<span class="sourceLineNo">068</span> * reference of this object and use it to open new single region scanners.<a name="line.68"></a>
-<span class="sourceLineNo">069</span> */<a name="line.69"></a>
-<span class="sourceLineNo">070</span>@InterfaceAudience.Private<a name="line.70"></a>
-<span class="sourceLineNo">071</span>class AsyncScanSingleRegionRpcRetryingCaller {<a name="line.71"></a>
-<span class="sourceLineNo">072</span><a name="line.72"></a>
-<span class="sourceLineNo">073</span> private static final Log LOG = LogFactory.getLog(AsyncScanSingleRegionRpcRetryingCaller.class);<a name="line.73"></a>
-<span class="sourceLineNo">074</span><a name="line.74"></a>
-<span class="sourceLineNo">075</span> private final HashedWheelTimer retryTimer;<a name="line.75"></a>
-<span class="sourceLineNo">076</span><a name="line.76"></a>
-<span class="sourceLineNo">077</span> private final Scan scan;<a name="line.77"></a>
-<span class="sourceLineNo">078</span><a name="line.78"></a>
-<span class="sourceLineNo">079</span> private final ScanMetrics scanMetrics;<a name="line.79"></a>
-<span class="sourceLineNo">080</span><a name="line.80"></a>
-<span class="sourceLineNo">081</span> private final long scannerId;<a name="line.81"></a>
-<span class="sourceLineNo">082</span><a name="line.82"></a>
-<span class="sourceLineNo">083</span> private final ScanResultCache resultCache;<a name="line.83"></a>
-<span class="sourceLineNo">084</span><a name="line.84"></a>
-<span class="sourceLineNo">085</span> private final RawScanResultConsumer consumer;<a name="line.85"></a>
-<span class="sourceLineNo">086</span><a name="line.86"></a>
-<span class="sourceLineNo">087</span> private final ClientService.Interface stub;<a name="line.87"></a>
-<span class="sourceLineNo">088</span><a name="line.88"></a>
-<span class="sourceLineNo">089</span> private final HRegionLocation loc;<a name="line.89"></a>
-<span class="sourceLineNo">090</span><a name="line.90"></a>
-<span class="sourceLineNo">091</span> private final boolean regionServerRemote;<a name="line.91"></a>
-<span class="sourceLineNo">092</span><a name="line.92"></a>
-<span class="sourceLineNo">093</span> private final long scannerLeaseTimeoutPeriodNs;<a name="line.93"></a>
-<span class="sourceLineNo">094</span><a name="line.94"></a>
-<span class="sourceLineNo">095</span> private final long pauseNs;<a name="line.95"></a>
-<span class="sourceLineNo">096</span><a name="line.96"></a>
-<span class="sourceLineNo">097</span> private final int maxAttempts;<a name="line.97"></a>
-<span class="sourceLineNo">098</span><a name="line.98"></a>
-<span class="sourceLineNo">099</span> private final long scanTimeoutNs;<a name="line.99"></a>
-<span class="sourceLineNo">100</span><a name="line.100"></a>
-<span class="sourceLineNo">101</span> private final long rpcTimeoutNs;<a name="line.101"></a>
-<span class="sourceLineNo">102</span><a name="line.102"></a>
-<span class="sourceLineNo">103</span> private final int startLogErrorsCnt;<a name="line.103"></a>
-<span class="sourceLineNo">104</span><a name="line.104"></a>
-<span class="sourceLineNo">105</span> private final Runnable completeWhenNoMoreResultsInRegion;<a name="line.105"></a>
-<span class="sourceLineNo">106</span><a name="line.106"></a>
-<span class="sourceLineNo">107</span> private final CompletableFuture<Boolean> future;<a name="line.107"></a>
-<span class="sourceLineNo">108</span><a name="line.108"></a>
-<span class="sourceLineNo">109</span> private final HBaseRpcController controller;<a name="line.109"></a>
-<span class="sourceLineNo">110</span><a name="line.110"></a>
-<span class="sourceLineNo">111</span> private byte[] nextStartRowWhenError;<a name="line.111"></a>
-<span class="sourceLineNo">112</span><a name="line.112"></a>
-<span class="sourceLineNo">113</span> private boolean includeNextStartRowWhenError;<a name="line.113"></a>
-<span class="sourceLineNo">114</span><a name="line.114"></a>
-<span class="sourceLineNo">115</span> private long nextCallStartNs;<a name="line.115"></a>
-<span class="sourceLineNo">116</span><a name="line.116"></a>
-<span class="sourceLineNo">117</span> private int tries;<a name="line.117"></a>
-<span class="sourceLineNo">118</span><a name="line.118"></a>
-<span class="sourceLineNo">119</span> private final List<RetriesExhaustedException.ThrowableWithExtraContext> exceptions;<a name="line.119"></a>
-<span class="sourceLineNo">120</span><a name="line.120"></a>
-<span class="sourceLineNo">121</span> private long nextCallSeq = -1L;<a name="line.121"></a>
-<span class="sourceLineNo">122</span><a name="line.122"></a>
-<span class="sourceLineNo">123</span> private enum ScanControllerState {<a name="line.123"></a>
-<span class="sourceLineNo">124</span> INITIALIZED, SUSPENDED, TERMINATED, DESTROYED<a name="line.124"></a>
-<span class="sourceLineNo">125</span> }<a name="line.125"></a>
-<span class="sourceLineNo">126</span><a name="line.126"></a>
-<span class="sourceLineNo">127</span> // Since suspend and terminate should only be called within onNext or onHeartbeat(see the comments<a name="line.127"></a>
-<span class="sourceLineNo">128</span> // of RawScanResultConsumer.onNext and onHeartbeat), we need to add some check to prevent invalid<a name="line.128"></a>
-<span class="sourceLineNo">129</span> // usage. We use two things to prevent invalid usage:<a name="line.129"></a>
-<span class="sourceLineNo">130</span> // 1. Record the thread that construct the ScanControllerImpl instance. We will throw an<a name="line.130"></a>
-<span class="sourceLineNo">131</span> // IllegalStateException if the caller thread is not this thread.<a name="line.131"></a>
-<span class="sourceLineNo">132</span> // 2. The ControllerState. The initial state is INITIALIZED, if you call suspend, the state will<a name="line.132"></a>
-<span class="sourceLineNo">133</span> // be transformed to SUSPENDED, and if you call terminate, the state will be transformed to<a name="line.133"></a>
-<span class="sourceLineNo">134</span> // TERMINATED. And when we are back from onNext or onHeartbeat in the onComplete method, we will<a name="line.134"></a>
-<span class="sourceLineNo">135</span> // call destroy to get the current state and set the state to DESTROYED. And when user calls<a name="line.135"></a>
-<span class="sourceLineNo">136</span> // suspend or terminate, we will check if the current state is INITIALIZED, if not we will throw<a name="line.136"></a>
-<span class="sourceLineNo">137</span> // an IllegalStateException. Notice that the DESTROYED state is necessary as you may not call<a name="line.137"></a>
-<span class="sourceLineNo">138</span> // suspend or terminate so the state will still be INITIALIZED when back from onNext or<a name="line.138"></a>
-<span class="sourceLineNo">139</span> // onHeartbeat. We need another state to replace the INITIALIZED state to prevent the controller<a name="line.139"></a>
-<span class="sourceLineNo">140</span> // to be used in the future.<a name="line.140"></a>
-<span class="sourceLineNo">141</span> // Notice that, the public methods of this class is supposed to be called by upper layer only, and<a name="line.141"></a>
-<span class="sourceLineNo">142</span> // package private methods can only be called within the implementation of<a name="line.142"></a>
-<span class="sourceLineNo">143</span> // AsyncScanSingleRegionRpcRetryingCaller.<a name="line.143"></a>
-<span class="sourceLineNo">144</span> private final class ScanControllerImpl implements RawScanResultConsumer.ScanController {<a name="line.144"></a>
-<span class="sourceLineNo">145</span><a name="line.145"></a>
-<span class="sourceLineNo">146</span> // Make sure the methods are only called in this thread.<a name="line.146"></a>
-<span class="sourceLineNo">147</span> private final Thread callerThread = Thread.currentThread();<a name="line.147"></a>
-<span class="sourceLineNo">148</span><a name="line.148"></a>
-<span class="sourceLineNo">149</span> // INITIALIZED -> SUSPENDED -> DESTROYED<a name="line.149"></a>
-<span class="sourceLineNo">150</span> // INITIALIZED -> TERMINATED -> DESTROYED<a name="line.150"></a>
-<span class="sourceLineNo">151</span> // INITIALIZED -> DESTROYED<a name="line.151"></a>
-<span class="sourceLineNo">152</span> // If the state is incorrect we will throw IllegalStateException.<a name="line.152"></a>
-<span class="sourceLineNo">153</span> private ScanControllerState state = ScanControllerState.INITIALIZED;<a name="line.153"></a>
-<span class="sourceLineNo">154</span><a name="line.154"></a>
-<span class="sourceLineNo">155</span> private ScanResumerImpl resumer;<a name="line.155"></a>
-<span class="sourceLineNo">156</span><a name="line.156"></a>
-<span class="sourceLineNo">157</span> private void preCheck() {<a name="line.157"></a>
-<span class="sourceLineNo">158</span> Preconditions.checkState(Thread.currentThread() == callerThread,<a name="line.158"></a>
-<span class="sourceLineNo">159</span> "The current thread is %s, expected thread is %s, " +<a name="line.159"></a>
-<span class="sourceLineNo">160</span> "you should not call this method outside onNext or onHeartbeat",<a name="line.160"></a>
-<span class="sourceLineNo">161</span> Thread.currentThread(), callerThread);<a name="line.161"></a>
-<span class="sourceLineNo">162</span> Preconditions.checkState(state.equals(ScanControllerState.INITIALIZED),<a name="line.162"></a>
-<span class="sourceLineNo">163</span> "Invalid Stopper state %s", state);<a name="line.163"></a>
+<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;<a name="line.56"></a>
+<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.shaded.protobuf.RequestConverter;<a name="line.57"></a>
+<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.shaded.protobuf.ResponseConverter;<a name="line.58"></a>
+<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ClientService;<a name="line.59"></a>
+<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ClientService.Interface;<a name="line.60"></a>
+<span class="sourceLineNo">061</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ScanRequest;<a name="line.61"></a>
+<span class="sourceLineNo">062</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ClientProtos.ScanResponse;<a name="line.62"></a>
+<span class="sourceLineNo">063</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.63"></a>
+<span class="sourceLineNo">064</span><a name="line.64"></a>
+<span class="sourceLineNo">065</span>/**<a name="line.65"></a>
+<span class="sourceLineNo">066</span> * Retry caller for scanning a region.<a name="line.66"></a>
+<span class="sourceLineNo">067</span> * <p><a name="line.67"></a>
+<span class="sourceLineNo">068</span> * We will modify the {@link Scan} object passed in directly. The upper layer should store the<a name="line.68"></a>
+<span class="sourceLineNo">069</span> * reference of this object and use it to open new single region scanners.<a name="line.69"></a>
+<span class="sourceLineNo">070</span> */<a name="line.70"></a>
+<span class="sourceLineNo">071</span>@InterfaceAudience.Private<a name="line.71"></a>
+<span class="sourceLineNo">072</span>class AsyncScanSingleRegionRpcRetryingCaller {<a name="line.72"></a>
+<span class="sourceLineNo">073</span><a name="line.73"></a>
+<span class="sourceLineNo">074</span> private static final Log LOG = LogFactory.getLog(AsyncScanSingleRegionRpcRetryingCaller.class);<a name="line.74"></a>
+<span class="sourceLineNo">075</span><a name="line.75"></a>
+<span class="sourceLineNo">076</span> private final HashedWheelTimer retryTimer;<a name="line.76"></a>
+<span class="sourceLineNo">077</span><a name="line.77"></a>
+<span class="sourceLineNo">078</span> private final Scan scan;<a name="line.78"></a>
+<span class="sourceLineNo">079</span><a name="line.79"></a>
+<span class="sourceLineNo">080</span> private final ScanMetrics scanMetrics;<a name="line.80"></a>
+<span class="sourceLineNo">081</span><a name="line.81"></a>
+<span class="sourceLineNo">082</span> private final long scannerId;<a name="line.82"></a>
+<span class="sourceLineNo">083</span><a name="line.83"></a>
+<span class="sourceLineNo">084</span> private final ScanResultCache resultCache;<a name="line.84"></a>
+<span class="sourceLineNo">085</span><a name="line.85"></a>
+<span class="sourceLineNo">086</span> private final RawScanResultConsumer consumer;<a name="line.86"></a>
+<span class="sourceLineNo">087</span><a name="line.87"></a>
+<span class="sourceLineNo">088</span> private final ClientService.Interface stub;<a name="line.88"></a>
+<span class="sourceLineNo">089</span><a name="line.89"></a>
+<span class="sourceLineNo">090</span> private final HRegionLocation loc;<a name="line.90"></a>
+<span class="sourceLineNo">091</span><a name="line.91"></a>
+<span class="sourceLineNo">092</span> private final boolean regionServerRemote;<a name="line.92"></a>
+<span class="sourceLineNo">093</span><a name="line.93"></a>
+<span class="sourceLineNo">094</span> private final long scannerLeaseTimeoutPeriodNs;<a name="line.94"></a>
+<span class="sourceLineNo">095</span><a name="line.95"></a>
+<span class="sourceLineNo">096</span> private final long pauseNs;<a name="line.96"></a>
+<span class="sourceLineNo">097</span><a name="line.97"></a>
+<span class="sourceLineNo">098</span> private final int maxAttempts;<a name="line.98"></a>
+<span class="sourceLineNo">099</span><a name="line.99"></a>
+<span class="sourceLineNo">100</span> private final long scanTimeoutNs;<a name="line.100"></a>
+<span class="sourceLineNo">101</span><a name="line.101"></a>
+<span class="sourceLineNo">102</span> private final long rpcTimeoutNs;<a name="line.102"></a>
+<span class="sourceLineNo">103</span><a name="line.103"></a>
+<span class="sourceLineNo">104</span> private final int startLogErrorsCnt;<a name="line.104"></a>
+<span class="sourceLineNo">105</span><a name="line.105"></a>
+<span class="sourceLineNo">106</span> private final Runnable completeWhenNoMoreResultsInRegion;<a name="line.106"></a>
+<span class="sourceLineNo">107</span><a name="line.107"></a>
+<span class="sourceLineNo">108</span> private final CompletableFuture<Boolean> future;<a name="line.108"></a>
+<span class="sourceLineNo">109</span><a name="line.109"></a>
+<span class="sourceLineNo">110</span> private final HBaseRpcController controller;<a name="line.110"></a>
+<span class="sourceLineNo">111</span><a name="line.111"></a>
+<span class="sourceLineNo">112</span> private byte[] nextStartRowWhenError;<a name="line.112"></a>
+<span class="sourceLineNo">113</span><a name="line.113"></a>
+<span class="sourceLineNo">114</span> private boolean includeNextStartRowWhenError;<a name="line.114"></a>
+<span class="sourceLineNo">115</span><a name="line.115"></a>
+<span class="sourceLineNo">116</span> private long nextCallStartNs;<a name="line.116"></a>
+<span class="sourceLineNo">117</span><a name="line.117"></a>
+<span class="sourceLineNo">118</span> private int tries;<a name="line.118"></a>
+<span class="sourceLineNo">119</span><a name="line.119"></a>
+<span class="sourceLineNo">120</span> private final List<RetriesExhaustedException.ThrowableWithExtraContext> exceptions;<a name="line.120"></a>
+<span class="sourceLineNo">121</span><a name="line.121"></a>
+<span class="sourceLineNo">122</span> private long nextCallSeq = -1L;<a name="line.122"></a>
+<span class="sourceLineNo">123</span><a name="line.123"></a>
+<span class="sourceLineNo">124</span> private enum ScanControllerState {<a name="line.124"></a>
+<span class="sourceLineNo">125</span> INITIALIZED, SUSPENDED, TERMINATED, DESTROYED<a name="line.125"></a>
+<span class="sourceLineNo">126</span> }<a name="line.126"></a>
+<span class="sourceLineNo">127</span><a name="line.127"></a>
+<span class="sourceLineNo">128</span> // Since suspend and terminate should only be called within onNext or onHeartbeat(see the comments<a name="line.128"></a>
+<span class="sourceLineNo">129</span> // of RawScanResultConsumer.onNext and onHeartbeat), we need to add some check to prevent invalid<a name="line.129"></a>
+<span class="sourceLineNo">130</span> // usage. We use two things to prevent invalid usage:<a name="line.130"></a>
+<span class="sourceLineNo">131</span> // 1. Record the thread that construct the ScanControllerImpl instance. We will throw an<a name="line.131"></a>
+<span class="sourceLineNo">132</span> // IllegalStateException if the caller thread is not this thread.<a name="line.132"></a>
+<span class="sourceLineNo">133</span> // 2. The ControllerState. The initial state is INITIALIZED, if you call suspend, the state will<a name="line.133"></a>
+<span class="sourceLineNo">134</span> // be transformed to SUSPENDED, and if you call terminate, the state will be transformed to<a name="line.134"></a>
+<span class="sourceLineNo">135</span> // TERMINATED. And when we are back from onNext or onHeartbeat in the onComplete method, we will<a name="line.135"></a>
+<span class="sourceLineNo">136</span> // call destroy to get the current state and set the state to DESTROYED. And when user calls<a name="line.136"></a>
+<span class="sourceLineNo">137</span> // suspend or terminate, we will check if the current state is INITIALIZED, if not we will throw<a name="line.137"></a>
+<span class="sourceLineNo">138</span> // an IllegalStateException. Notice that the DESTROYED state is necessary as you may not call<a name="line.138"></a>
+<span class="sourceLineNo">139</span> // suspend or terminate so the state will still be INITIALIZED when back from onNext or<a name="line.139"></a>
+<span class="sourceLineNo">140</span> // onHeartbeat. We need another state to replace the INITIALIZED state to prevent the controller<a name="line.140"></a>
+<span class="sourceLineNo">141</span> // to be used in the future.<a name="line.141"></a>
+<span class="sourceLineNo">142</span> // Notice that, the public methods of this class is supposed to be called by upper layer only, and<a name="line.142"></a>
+<span class="sourceLineNo">143</span> // package private methods can only be called within the implementation of<a name="line.143"></a>
+<span class="sourceLineNo">144</span> // AsyncScanSingleRegionRpcRetryingCaller.<a name="line.144"></a>
+<span class="sourceLineNo">145</span> private final class ScanControllerImpl implements RawScanResultConsumer.ScanController {<a name="line.145"></a>
+<span class="sourceLineNo">146</span><a name="line.146"></a>
+<span class="sourceLineNo">147</span> // Make sure the methods are only called in this thread.<a name="line.147"></a>
+<span class="sourceLineNo">148</span> private final Thread callerThread;<a name="line.148"></a>
+<span class="sourceLineNo">149</span><a name="line.149"></a>
+<span class="sourceLineNo">150</span> private final Optional<Cursor> cursor;<a name="line.150"></a>
+<span class="sourceLineNo">151</span><a name="line.151"></a>
+<span class="sourceLineNo">152</span> // INITIALIZED -> SUSPENDED -> DESTROYED<a name="line.152"></a>
+<span class="sourceLineNo">153</span> // INITIALIZED -> TERMINATED -> DESTROYED<a name="line.153"></a>
+<span class="sourceLineNo">154</span> // INITIALIZED -> DESTROYED<a name="line.154"></a>
+<span class="sourceLineNo">155</span> // If the state is incorrect we will throw IllegalStateException.<a name="line.155"></a>
+<span class="sourceLineNo">156</span> private ScanControllerState state = ScanControllerState.INITIALIZED;<a name="line.156"></a>
+<span class="sourceLineNo">157</span><a name="line.157"></a>
+<span class="sourceLineNo">158</span> private ScanResumerImpl resumer;<a name="line.158"></a>
+<span class="sourceLineNo">159</span><a name="line.159"></a>
+<span class="sourceLineNo">160</span> public ScanControllerImpl(ScanResponse resp) {<a name="line.160"></a>
+<span class="sourceLineNo">161</span> callerThread = Thread.currentThread();<a name="line.161"></a>
+<span class="sourceLineNo">162</span> cursor = resp.hasCursor() ? Optional.of(ProtobufUtil.toCursor(resp.getCursor()))<a name="line.162"></a>
+<span class="sourceLineNo">163</span> : Optional.empty();<a name="line.163"></a>
<span class="sourceLineNo">164</span> }<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
-<span class="sourceLineNo">166</span> @Override<a name="line.166"></a>
-<span class="sourceLineNo">167</span> public ScanResumer suspend() {<a name="line.167"></a>
-<span class="sourceLineNo">168</span> preCheck();<a name="line.168"></a>
-<span class="sourceLineNo">169</span> state = ScanControllerState.SUSPENDED;<a name="line.169"></a>
-<span class="sourceLineNo">170</span> ScanResumerImpl resumer = new ScanResumerImpl();<a name="line.170"></a>
-<span class="sourceLineNo">171</span> this.resumer = resumer;<a name="line.171"></a>
-<span class="sourceLineNo">172</span> return resumer;<a name="line.172"></a>
+<span class="sourceLineNo">166</span> private void preCheck() {<a name="line.166"></a>
+<span class="sourceLineNo">167</span> Preconditions.checkState(Thread.currentThread() == callerThread,<a name="line.167"></a>
+<span class="sourceLineNo">168</span> "The current thread is %s, expected thread is %s, " +<a name="line.168"></a>
+<span class="sourceLineNo">169</span> "you should not call this method outside onNext or onHeartbeat",<a name="line.169"></a>
+<span class="sourceLineNo">170</span> Thread.currentThread(), callerThread);<a name="line.170"></a>
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-<span class="sourceLineNo">268</span> // return false if the scan has already been resumed. See the comment above for ScanResumerImpl<a name="line.268"></a>
-<span class="sourceLineNo">269</span> // for more details.<a name="line.269"></a>
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