PARIS — Soldiers are patrolling French beaches through the August holiday. There has been talk of Guantánamo-style holding pens for thousands of terrorism suspects. The prime minister has suggested ending foreign funding for mosques.

For now, the more extreme measures have been rejected by the government or have gained little traction in the wake of a deadly accumulation of terrorist attacks this summer.

But that they have been floated at all is a measure of France’s struggle to find solutions to a security problem that is now drawing comparisons to the one in Israel, or to the Islamist insurgency in France’s former colony of Algeria in the 1990s.

With a presidential race primed to heat up in the fall, the debate over how France should respond seems likely to intensify, forcing the country to confront whether it can maintain its aversion to sweeping changes in its security and judicial systems and live with the grim knowledge that there will be further attacks.