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      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Author</dt>
      <dd style="margin-left: 8.5em">Kouhei Sutou &lt;kou****@clear*****&gt;</dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Date</dt>
      <dd style="margin-left: 8.5em">2014-04-22 12:10:06 +0900 (Tue, 22 Apr 2014)</dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">New Revision</dt>
      <dd style="margin-left: 8.5em"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d">e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d</a></dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Message</dt>
      <dd style="margin-left: 8.5em"><pre style="border: 1px solid #aaa; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; padding: 0.5em; width: auto">droonga-engine: implement graceful restart</pre></dd>
      <dt style="clear: both; float: left; font-weight: bold; width: 8em">Modified files</dt>
      <dd style="margin-left: 8.5em">
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          <li><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#diff-0">lib/droonga/engine/command/droonga_engine.rb</a></li>
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<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">  Modified: lib/droonga/engine/command/droonga_engine.rb (+35 -2)</span>
<span class="diff-header-mark" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">===================================================================</span>
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<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0L132">...</a></span>
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<span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R148">...</a></span>
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<span class="diff-line-number-hunk-header" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R171">...</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R172">172</a></span>
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<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R174">174</a></span>
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<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R184">184</a></span>
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<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R362">362</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R363">363</a></span>
<span class="diff-line-number-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R364">364</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R365">365</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R366">366</a></span>
<span class="diff-line-number-not-changed" style="display: block; white-space: pre"><a href="https://github.com/droonga/droonga-engine/commit/e5d6cb7d25388b50c3a31cd898ad8ca740f3b84d#L0R367">367</a></span>
</pre>
            </th>
            <td class="diff-content" style="border: 1px solid #aaa">
<pre style="border: 0; font-family: Consolas, Menlo, &quot;Liberation Mono&quot;, Courier, monospace; line-height: 1.2; margin: 0; padding: 0.5em; white-space: normal; width: auto"><span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -133,7 +133,7 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">module Droonga</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">             parser.parse!(command_line_arguments)</span>
<span class="diff-not-changed" style="display: block; white-space: pre">           end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-          def run_service</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+          def run_service(ready_notify_fd=nil)</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             listen_fd = @listen_socket.fileno</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             heartbeat_fd = @heartbeat_socket.fileno</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             env = {}</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -149,6 +149,10 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">module Droonga</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">               listen_fd =&gt; listen_fd,</span>
<span class="diff-not-changed" style="display: block; white-space: pre">               heartbeat_fd =&gt; heartbeat_fd,</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             }</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            if ready_notify_fd</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              command_line.push(&quot;--ready-notify-fd&quot;, ready_notify_fd.to_s)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              options[ready_notify_fd] = ready_notify_fd</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             spawn(env, *command_line, options)</span>
<span class="diff-not-changed" style="display: block; white-space: pre">           end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -168,11 +172,21 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">module Droonga</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">               Process.kill(Signals::IMMEDIATE_STOP, service_pid)</span>
<span class="diff-not-changed" style="display: block; white-space: pre">               running = false</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            trap(Signals::GRACEFUL_RESTART) do</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              old_service_pid = service_pid</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              IO.pipe do |ready_notify_read_io, ready_notify_write_io|</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+                service_pid = run_service(ready_notify_write_io.fileno)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+                ready_notify_write_io.close</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+                IO.select([ready_notify_read_io])</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+                Process.kill(Signals::GRACEFUL_STOP, old_service_pid)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre">             succeeded = true</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             while running</span>
<span class="diff-deleted" style="background-color: #ffaaaa; color: #000000; display: block; white-space: pre">-              service_pid = run_service</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              service_pid ||= run_service</span>
<span class="diff-not-changed" style="display: block; white-space: pre">               _, status = Process.waitpid2(service_pid)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              service_pid = nil</span>
<span class="diff-not-changed" style="display: block; white-space: pre">               if status.nil?</span>
<span class="diff-not-changed" style="display: block; white-space: pre">                 succeeded = false</span>
<span class="diff-not-changed" style="display: block; white-space: pre">                 break</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -198,6 +212,7 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">module Droonga</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">             @configuration = Configuration.new</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             @listen_fd = nil</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             @heartbeat_fd = nil</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            @ready_notiofy_fd = nil</span>
<span class="diff-not-changed" style="display: block; white-space: pre">           end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre">           def run(command_line_arguments)</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -232,6 +247,10 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">module Droonga</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">                       &quot;Use FD as the heartbeat file descriptor&quot;) do |fd|</span>
<span class="diff-not-changed" style="display: block; white-space: pre">               @heartbeat_fd = fd</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            parser.on(&quot;--ready-notify-fd=FD&quot;, Integer,</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+                      &quot;Use FD for notifying the service ready&quot;) do |fd|</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              @ready_notify_fd = fd</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">           end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-not-changed" style="display: block; white-space: pre">           def run_services</span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -243,6 +262,7 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">module Droonga</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">             run_engine</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             run_receiver</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             setup_signals</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            notify_ready</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             @loop.run</span>
<span class="diff-not-changed" style="display: block; white-space: pre">           end</span>
<span class="diff-not-changed" style="display: block; white-space: pre"> </span>
<span class="diff-hunk-header" style="background-color: #eaf2f5; color: #999999; display: block; white-space: pre">@@ -329,6 +349,19 @@ <span class="diff-context" style="background-color: #ffffaa; color: #000000">module Droonga</span></span>
<span class="diff-not-changed" style="display: block; white-space: pre">             stop_graceful</span>
<span class="diff-not-changed" style="display: block; white-space: pre">             shutdown_services</span>
<span class="diff-not-changed" style="display: block; white-space: pre">           end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+          def notify_ready</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            return if @ready_notify_fd.nil?</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            ready_notify_io = IO.new(@ready_notify_fd)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            @ready_notify_fd = nil</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            watcher = Coolio::IOWatcher.new(ready_notify_io, &quot;w&quot;)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            @loop.attach(watcher)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            watcher.on_writable do</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              ready_notify_io.write(&quot;ready\n&quot;)</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              ready_notify_io.close</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+              detach</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+            end</span>
<span class="diff-added" style="background-color: #aaffaa; color: #000000; display: block; white-space: pre">+          end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">         end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">       end</span>
<span class="diff-not-changed" style="display: block; white-space: pre">     end</span>
</pre>
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